[v9,10/10] drivers: clk: Add ZynqMP clock driver

Commit Message

Jolly Shah June 20, 2018, 5:40 p.m. UTC

From: Jolly Shah <[e-mail]>

This patch adds CCF compliant clock driver for ZynqMP.
Clock driver queries supported clock information from
firmware and regiters pll and output clocks with CCF.

Signed-off-by: Rajan Vaja <[e-mail]>
Signed-off-by: Tejas Patel <[e-mail]>
Signed-off-by: Shubhrajyoti Datta <[e-mail]>
Signed-off-by: Jolly Shah <[e-mail]>
---
 drivers/clk/Kconfig                  |   1 +
 drivers/clk/Makefile                 |   1 +
 drivers/clk/zynqmp/Kconfig           |  11 +
 drivers/clk/zynqmp/Makefile          |   4 +
 drivers/clk/zynqmp/clk-gate-zynqmp.c | 146 +++++++
 drivers/clk/zynqmp/clk-mux-zynqmp.c  | 150 +++++++
 drivers/clk/zynqmp/clk-zynqmp.h      |  53 +++
 drivers/clk/zynqmp/clkc.c            | 737 +++++++++++++++++++++++++++++++++++
 drivers/clk/zynqmp/divider.c         | 219 +++++++++++
 drivers/clk/zynqmp/pll.c             | 345 ++++++++++++++++
 10 files changed, 1667 insertions(+)
 create mode 100644 drivers/clk/zynqmp/Kconfig
 create mode 100644 drivers/clk/zynqmp/Makefile
 create mode 100644 drivers/clk/zynqmp/clk-gate-zynqmp.c
 create mode 100644 drivers/clk/zynqmp/clk-mux-zynqmp.c
 create mode 100644 drivers/clk/zynqmp/clk-zynqmp.h
 create mode 100644 drivers/clk/zynqmp/clkc.c
 create mode 100644 drivers/clk/zynqmp/divider.c
 create mode 100644 drivers/clk/zynqmp/pll.c

Comments

Stephen Boyd July 9, 2018, 5:26 a.m. UTC | #1

Quoting Jolly Shah (2018-06-20 10:40:35)
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 98ce9fc..a2ebcf7 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -252,6 +252,7 @@ source "drivers/clk/sprd/Kconfig"
>  source "drivers/clk/sunxi-ng/Kconfig"
>  source "drivers/clk/tegra/Kconfig"
>  source "drivers/clk/ti/Kconfig"
> +source "drivers/clk/zynqmp/Kconfig"
>  source "drivers/clk/uniphier/Kconfig"

z comes after u, this is wrong.

>  
>  endmenu
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index 71ec41e..b6ac0d2 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -100,3 +100,4 @@ obj-$(CONFIG_X86)                   += x86/
>  endif
>  obj-$(CONFIG_ARCH_ZX)                  += zte/
>  obj-$(CONFIG_ARCH_ZYNQ)                        += zynq/
> +obj-$(CONFIG_COMMON_CLK_ZYNQMP)         += zynqmp/
> diff --git a/drivers/clk/zynqmp/Kconfig b/drivers/clk/zynqmp/Kconfig
> new file mode 100644
> index 0000000..0f8986c
> --- /dev/null
> +++ b/drivers/clk/zynqmp/Kconfig
> @@ -0,0 +1,11 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +config COMMON_CLK_ZYNQMP
> +       bool "Support for Xilinx ZynqMP Ultrascale+ clock controllers"
> +       depends on OF

What relies on OF that isn't stubbed out when OF=n? 

> +       depends on ARCH_ZYNQMP || COMPILE_TEST
> +       depends on ZYNQMP_FIRMWARE
> +       help
> +         Support for the Zynqmp Ultrascale clock controller.
> +         It has a dependency on the PMU firmware.
> +         Say Y if you want to include clock support.
> diff --git a/drivers/clk/zynqmp/clk-gate-zynqmp.c b/drivers/clk/zynqmp/clk-gate-zynqmp.c
> new file mode 100644
> index 0000000..b927eb1
> --- /dev/null
> +++ b/drivers/clk/zynqmp/clk-gate-zynqmp.c
> @@ -0,0 +1,146 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Zynq UltraScale+ MPSoC clock controller
> + *
> + *  Copyright (C) 2016-2018 Xilinx
> + *
> + * Gated clock implementation
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/slab.h>
> +#include "clk-zynqmp.h"
> +
> +/**
> + * struct clk_gate - gating clock
> + * @hw:                handle between common and hardware-specific interfaces
> + * @flags:     hardware-specific flags
> + * @clk_id:    Id of clock
> + */
> +struct zynqmp_clk_gate {
> +       struct clk_hw hw;
> +       u8 flags;
> +       u32 clk_id;
> +};
> +
> +#define to_zynqmp_clk_gate(_hw) container_of(_hw, struct zynqmp_clk_gate, hw)
> +
> +/**
> + * zynqmp_clk_gate_enable() - Enable clock
> + * @hw:                handle between common and hardware-specific interfaces
> + *
> + * Return: 0 on success else error code
> + */
> +static int zynqmp_clk_gate_enable(struct clk_hw *hw)
> +{
> +       struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = gate->clk_id;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       ret = eemi_ops->clock_enable(clk_id);
> +
> +       if (ret)
> +               pr_warn_once("%s() clock enabled failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +
> +       return ret;
> +}
> +
> +/*
> + * zynqmp_clk_gate_disable() - Disable clock
> + * @hw:                handle between common and hardware-specific interfaces
> + */
> +static void zynqmp_clk_gate_disable(struct clk_hw *hw)
> +{
> +       struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = gate->clk_id;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       ret = eemi_ops->clock_disable(clk_id);
> +
> +       if (ret)
> +               pr_warn_once("%s() clock disable failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +}
> +
> +/**
> + * zynqmp_clk_gate_is_enable() - Check clock state
> + * @hw:                handle between common and hardware-specific interfaces
> + *
> + * Return: 1 if enabled, 0 if disabled else error code
> + */
> +static int zynqmp_clk_gate_is_enabled(struct clk_hw *hw)
> +{
> +       struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = gate->clk_id;
> +       int state, ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       ret = eemi_ops->clock_getstate(clk_id, &state);
> +       if (ret) {
> +               pr_warn_once("%s() clock get state failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +               return -EIO;
> +       }
> +
> +       return state ? 1 : 0;
> +}
> +
> +const struct clk_ops zynqmp_clk_gate_ops = {

static?

> +       .enable = zynqmp_clk_gate_enable,
> +       .disable = zynqmp_clk_gate_disable,
> +       .is_enabled = zynqmp_clk_gate_is_enabled,
> +};
> +EXPORT_SYMBOL_GPL(zynqmp_clk_gate_ops);
> +

Or why is it exported?

> +/**
> + * zynqmp_clk_register_gate() - register a gate clock with the clock framework
> + * @dev:               device that is registering this clock
> + * @name:              name of this clock
> + * @clk_id:            Id of this clock
> + * @parent:            name of this clock's parent
> + * @flags:             framework-specific flags for this clock
> + * @clk_gate_flags:    gate-specific flags for this clock
> + *
> + * Return: clock hardware of the registered clock gate
> + */
> +struct clk_hw *zynqmp_clk_register_gate(struct device *dev, const char *name,
> +                                       u32 clk_id, const char *parent,
> +                                       unsigned long flags,
> +                                       u8 clk_gate_flags)
> +{
> +       struct zynqmp_clk_gate *gate;
> +       struct clk_hw *hw;
> +       int ret;
> +       struct clk_init_data init;
> +
> +       /* allocate the gate */
> +       gate = kzalloc(sizeof(*gate), GFP_KERNEL);
> +       if (!gate)
> +               return ERR_PTR(-ENOMEM);
> +
> +       init.name = name;
> +       init.ops = &zynqmp_clk_gate_ops;
> +       init.flags = flags;
> +       init.parent_names = &parent;
> +       init.num_parents = 1;
> +
> +       /* struct clk_gate assignments */
> +       gate->flags = clk_gate_flags;
> +       gate->hw.init = &init;
> +       gate->clk_id = clk_id;
> +
> +       hw = &gate->hw;
> +       ret = clk_hw_register(dev, hw);

But dev is always NULL? Seems to be a lot of copy/paste going on.

> +       if (ret) {
> +               kfree(gate);
> +               hw = ERR_PTR(ret);
> +       }
> +
> +       return hw;
> +}
> diff --git a/drivers/clk/zynqmp/clk-mux-zynqmp.c b/drivers/clk/zynqmp/clk-mux-zynqmp.c
> new file mode 100644
> index 0000000..a0b452d
> --- /dev/null
> +++ b/drivers/clk/zynqmp/clk-mux-zynqmp.c
> @@ -0,0 +1,150 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Zynq UltraScale+ MPSoC mux
> + *
> + *  Copyright (C) 2016-2018 Xilinx
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/slab.h>
> +#include "clk-zynqmp.h"
> +
> +/*
> + * DOC: basic adjustable multiplexer clock that cannot gate
> + *
> + * Traits of this clock:
> + * prepare - clk_prepare only ensures that parents are prepared
> + * enable - clk_enable only ensures that parents are enabled
> + * rate - rate is only affected by parent switching.  No clk_set_rate support
> + * parent - parent is adjustable through clk_set_parent
> + */
> +
> +/**
> + * struct zynqmp_clk_mux - multiplexer clock
> + *
> + * @hw:                handle between common and hardware-specific interfaces
> + * @flags:     hardware-specific flags
> + * @clk_id:    Id of clock
> + */
> +struct zynqmp_clk_mux {
> +       struct clk_hw hw;
> +       u8 flags;
> +       u32 clk_id;
> +};
> +
> +#define to_zynqmp_clk_mux(_hw) container_of(_hw, struct zynqmp_clk_mux, hw)
> +
> +/**
> + * zynqmp_clk_mux_get_parent() - Get parent of clock
> + * @hw:                handle between common and hardware-specific interfaces
> + *
> + * Return: Parent index
> + */
> +static u8 zynqmp_clk_mux_get_parent(struct clk_hw *hw)
> +{
> +       struct zynqmp_clk_mux *mux = to_zynqmp_clk_mux(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = mux->clk_id;
> +       u32 val;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       ret = eemi_ops->clock_getparent(clk_id, &val);
> +
> +       if (ret)
> +               pr_warn_once("%s() getparent failed for clock: %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +
> +       return val;
> +}
> +
> +/**
> + * zynqmp_clk_mux_set_parent() - Set parent of clock
> + * @hw:                handle between common and hardware-specific interfaces
> + * @index:     Parent index
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_clk_mux_set_parent(struct clk_hw *hw, u8 index)
> +{
> +       struct zynqmp_clk_mux *mux = to_zynqmp_clk_mux(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = mux->clk_id;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       ret = eemi_ops->clock_setparent(clk_id, index);
> +
> +       if (ret)
> +               pr_warn_once("%s() set parent failed for clock: %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +
> +       return ret;
> +}
> +
> +const struct clk_ops zynqmp_clk_mux_ops = {

static?

> +       .get_parent = zynqmp_clk_mux_get_parent,
> +       .set_parent = zynqmp_clk_mux_set_parent,
> +       .determine_rate = __clk_mux_determine_rate,
> +};
> +EXPORT_SYMBOL_GPL(zynqmp_clk_mux_ops);

Or why is it exported?

> +
> +const struct clk_ops zynqmp_clk_mux_ro_ops = {
> +       .get_parent = zynqmp_clk_mux_get_parent,
> +};
> +EXPORT_SYMBOL_GPL(zynqmp_clk_mux_ro_ops);

Same.

> +
> +/**
> + * zynqmp_clk_register_mux() - register a mux table with the clock
> + *                            framework
> + * @dev:               device that is registering this clock
> + * @name:              name of this clock
> + * @clk_id:            Id of this clock
> + * @parents:           name of this clock's parents
> + * @num_parents:       number of parents
> + * @flags:             framework-specific flags for this clock
> + * @clk_mux_flags:     mux-specific flags for this clock
> + *
> + * Return: clock hardware of the registered clock mux
> + */
> +struct clk_hw *zynqmp_clk_register_mux(struct device *dev, const char *name,
> +                                      u32 clk_id,
> +                                      const char * const *parents,
> +                                      u8 num_parents,
> +                                      unsigned long flags,
> +                                      u8 clk_mux_flags)
> +{
> +       struct zynqmp_clk_mux *mux;
> +       struct clk_hw *hw;
> +       struct clk_init_data init;
> +       int ret;
> +
> +       /* allocate the mux */

Obvious comment, remove.

> +       mux = kzalloc(sizeof(*mux), GFP_KERNEL);
> +       if (!mux)
> +               return ERR_PTR(-ENOMEM);
> +
> +       init.name = name;
> +       if (clk_mux_flags & CLK_MUX_READ_ONLY)
> +               init.ops = &zynqmp_clk_mux_ro_ops;
> +       else
> +               init.ops = &zynqmp_clk_mux_ops;
> +       init.flags = flags;
> +       init.parent_names = parents;
> +       init.num_parents = num_parents;
> +
> +       /* struct clk_mux assignments */

Obvious comment, remove.

> +       mux->flags = clk_mux_flags;
> +       mux->hw.init = &init;
> +       mux->clk_id = clk_id;
> +
> +       hw = &mux->hw;
> +       ret = clk_hw_register(dev, hw);
> +       if (ret) {
> +               kfree(hw);
> +               hw = ERR_PTR(ret);
> +       }
> +
> +       return hw;
> +}
> +EXPORT_SYMBOL_GPL(zynqmp_clk_register_mux);
> diff --git a/drivers/clk/zynqmp/clkc.c b/drivers/clk/zynqmp/clkc.c
> new file mode 100644
> index 0000000..a315fc2
> --- /dev/null
> +++ b/drivers/clk/zynqmp/clkc.c
> @@ -0,0 +1,737 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Zynq UltraScale+ MPSoC clock controller
> + *
> + *  Copyright (C) 2016-2018 Xilinx
> + *
> + * Based on drivers/clk/zynq/clkc.c
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/slab.h>
> +#include <linux/string.h>
> +
> +#include "clk-zynqmp.h"
> +
> +#define MAX_PARENT                     100
> +#define MAX_NODES                      6
> +#define MAX_NAME_LEN                   50
> +#define MAX_CLOCK                      300
> +
> +#define CLK_INIT_ENABLE_SHIFT          1
> +#define CLK_TYPE_SHIFT                 2
> +
> +#define PM_API_PAYLOAD_LEN             3
> +
> +#define NA_PARENT                      0xFFFFFFFF
> +#define DUMMY_PARENT                   0xFFFFFFFE
> +
> +#define CLK_TYPE_FIELD_LEN             4
> +#define CLK_TOPOLOGY_NODE_OFFSET       16
> +#define NODES_PER_RESP                 3
> +
> +#define CLK_TYPE_FIELD_MASK            0xF
> +#define CLK_FLAG_FIELD_MASK            GENMASK(21, 8)
> +#define CLK_TYPE_FLAG_FIELD_MASK       GENMASK(31, 24)
> +
> +#define CLK_PARENTS_ID_LEN             16
> +#define CLK_PARENTS_ID_MASK            0xFFFF
> +
> +/* Flags for parents */
> +#define PARENT_CLK_SELF                        0
> +#define PARENT_CLK_NODE1               1
> +#define PARENT_CLK_NODE2               2
> +#define PARENT_CLK_NODE3               3
> +#define PARENT_CLK_NODE4               4
> +#define PARENT_CLK_EXTERNAL            5
> +
> +#define END_OF_CLK_NAME                        "END_OF_CLK"
> +#define RESERVED_CLK_NAME              ""
> +
> +#define CLK_VALID_MASK                 0x1
> +#define CLK_INIT_ENABLE_MASK           (0x1 << CLK_INIT_ENABLE_SHIFT)
> +
> +enum clk_type {
> +       CLK_TYPE_OUTPUT,
> +       CLK_TYPE_EXTERNAL,
> +};
> +
> +/**
> + * struct clock_parent - Structure for parent of clock

Please remove 'structure' from all these kernel docs on structures. It's
redundant.

> + * @name:      Parent name
> + * @id:                Parent clock ID
> + * @flag:      Parent flags
> + */
> +struct clock_parent {
> +       char name[MAX_NAME_LEN];
> +       int id;
> +       u32 flag;
> +};
> +
> +/**
> + * struct clock_topology - Structure for topology of clock
> + * @type:      Type of topology
> + * @flag:      Topology flags
> + * @type_flag: Topology type specific flag
> + */
> +struct clock_topology {
> +       u32 type;
> +       u32 flag;
> +       u32 type_flag;
> +};
> +
> +/**
> + * struct zynqmp_clock - Structure for clock
> + * @clk_name:          Clock name
> + * @valid:             Validity flag of clock
> + * @init_enable:       init_enable flag of clock

This doesn't describe what it means though.

> + * @type:              Clock type (Output/External)
> + * @node:              Clock tolology nodes

topology?

> + * @num_nodes:         Number of nodes present in topology
> + * @parent:            structure of parent of clock

Why isn't structure capitalized?

> + * @num_parents:       Number of parents of clock
> + */
> +struct zynqmp_clock {
> +       char clk_name[MAX_NAME_LEN];
> +       u32 valid;
> +       u32 init_enable;
> +       enum clk_type type;
> +       struct clock_topology node[MAX_NODES];
> +       u32 num_nodes;
> +       struct clock_parent parent[MAX_PARENT];
> +       u32 num_parents;
> +};
> +
> +static const char clk_type_postfix[][10] = {
> +       [TYPE_INVALID] = "",
> +       [TYPE_MUX] = "_mux",
> +       [TYPE_GATE] = "",
> +       [TYPE_DIV1] = "_div1",
> +       [TYPE_DIV2] = "_div2",
> +       [TYPE_FIXEDFACTOR] = "_ff",
> +       [TYPE_PLL] = ""
> +};
> +
> +static struct zynqmp_clock clock[MAX_CLOCK];

Can this be allocated at runtime instead of wasting a bunch of space in
the Image?

> +static struct clk_hw_onecell_data *zynqmp_data;
> +static unsigned int clock_max_idx;
> +static const struct zynqmp_eemi_ops *eemi_ops;
> +
> +/**
> + * zynqmp_is_valid_clock() - Check whether clock is valid or not
> + * @clk_id:    Clock index
> + * @valid:     1: if clock is valid
> + *             0: invalid clock
> + *
> + * Return: 0 on success else error code

Why not return < 0 on error, 0 if invalid, and 1 if valid? Then we can
get rid of the u32 pointer that just leads to more confusion.

> + */
> +static int zynqmp_is_valid_clock(u32 clk_id, u32 *valid)
> +{
> +       if (clk_id > clock_max_idx)
> +               return -ENODEV;
> +
> +       *valid = clock[clk_id].valid;
> +
> +       return *valid ? 0 : -EINVAL;
> +}
> +
> +/**
> + * zynqmp_get_clock_name() - Get name of clock from Clock index
> + * @clk_id:    Clock index
> + * @clk_name:  Name of clock
> + *
> + * Return: 0 on success else error code
> + */
> +static int zynqmp_get_clock_name(u32 clk_id, char *clk_name)
> +{
> +       int ret;
> +       u32 valid;
> +
> +       ret = zynqmp_is_valid_clock(clk_id, &valid);
> +       if (!ret && valid) {
> +               strncpy(clk_name, clock[clk_id].clk_name, MAX_NAME_LEN);
> +               return ret;
> +       } else {
> +               return ret;
> +       }

Just return ret for else statements with return ret inside them.

> +}
> +
> +/**
> + * zynqmp_get_clock_type() - Get type of clock
> + * @clk_id:    Clock index
> + * @type:      Clock type: CLK_TYPE_OUTPUT or CLK_TYPE_EXTERNAL
> + *
> + * Return: 0 on success else error code
> + */
> +static int zynqmp_get_clock_type(u32 clk_id, u32 *type)
> +{
> +       int ret;
> +       u32 valid;
> +
> +       ret = zynqmp_is_valid_clock(clk_id, &valid);
> +       if (!ret && valid) {
> +               *type = clock[clk_id].type;
> +               return ret;
> +       } else {
> +               return ret;
> +       }

Again.

> +}
> +
> +/**
> + * zynqmp_pm_clock_get_name() - Get the name of clock for given id
> + * @clock_id:  ID of the clock to be queried
> + * @name:      Name of given clock
> + *
> + * This function is used to get name of clock specified by given
> + * clock ID.
> + *
> + * Return: Returns 0, in case of error name would be 0

say '@name' to indicate name means an argument.

> + */
> +static int zynqmp_pm_clock_get_name(u32 clock_id, char *name)
> +{
> +       struct zynqmp_pm_query_data qdata = {0};
> +       u32 ret_payload[PAYLOAD_ARG_CNT];
> +
> +       qdata.qid = PM_QID_CLOCK_GET_NAME;
> +       qdata.arg1 = clock_id;
> +
> +       eemi_ops->query_data(qdata, ret_payload);
> +       memcpy(name, ret_payload, CLK_GET_NAME_RESP_LEN);
> +
> +       return 0;
> +}
> +
> +/**
> + * zynqmp_pm_clock_get_topology() - Get the topology of clock for given id
> + * @clock_id:  ID of the clock to be queried
> + * @index:     Node index of clock topology
> + * @topology:  Buffer to store nodes in topology and flags
> + *
> + * This function is used to get topology information for the clock
> + * specified by given clock ID.
> + *
> + * This API will return 3 node of topology with a single response. To get
> + * other nodes, master should call same API in loop with new
> + * index till error is returned. E.g First call should have
> + * index 0 which will return nodes 0,1 and 2. Next call, index
> + * should be 3 which will return nodes 3,4 and 5 and so on.
> + *
> + * Return: Returns status, either success or error+reason

What is 'status'? 0 for everything's OK?

> + */
> +static int zynqmp_pm_clock_get_topology(u32 clock_id, u32 index, u32 *topology)
> +{
> +       struct zynqmp_pm_query_data qdata = {0};
> +       u32 ret_payload[PAYLOAD_ARG_CNT];
> +       int ret;
> +
> +       qdata.qid = PM_QID_CLOCK_GET_TOPOLOGY;
> +       qdata.arg1 = clock_id;
> +       qdata.arg2 = index;
> +
> +       ret = eemi_ops->query_data(qdata, ret_payload);
> +       memcpy(topology, &ret_payload[1], CLK_GET_TOPOLOGY_RESP_WORDS * 4);
> +
> +       return ret;
> +}
> +
> +/**
> + * zynqmp_pm_clock_get_fixedfactor_params() - Get clock's fixed factor params
> + * @clock_id:  Clock ID
> + * @mul:       Multiplication value
> + * @div:       Divisor value
> + *
> + * This function is used to get fixed factor parameters for the fixed
> + * clock. This API is applicable only for the fixed clock.
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_pm_clock_get_fixedfactor_params(u32 clock_id,
> +                                                 u32 *mul,
> +                                                 u32 *div)
> +{
> +       struct zynqmp_pm_query_data qdata = {0};
> +       u32 ret_payload[PAYLOAD_ARG_CNT];
> +       int ret;
> +
> +       qdata.qid = PM_QID_CLOCK_GET_FIXEDFACTOR_PARAMS;
> +       qdata.arg1 = clock_id;
> +
> +       ret = eemi_ops->query_data(qdata, ret_payload);
> +       *mul = ret_payload[1];
> +       *div = ret_payload[2];
> +
> +       return ret;
> +}
> +
> +/**
> + * zynqmp_pm_clock_get_parents() - Get the first 3 parents of clock for given id
> + * @clock_id:  Clock ID
> + * @index:     Parent index
> + * @parents:   3 parents of the given clock
> + *
> + * This function is used to get 3 parents for the clock specified by
> + * given clock ID.
> + *
> + * This API will return 3 parents with a single response. To get
> + * other parents, master should call same API in loop with new
> + * parent index till error is returned. E.g First call should have
> + * index 0 which will return parents 0,1 and 2. Next call, index
> + * should be 3 which will return parent 3,4 and 5 and so on.
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_pm_clock_get_parents(u32 clock_id, u32 index, u32 *parents)
> +{
> +       struct zynqmp_pm_query_data qdata = {0};
> +       u32 ret_payload[PAYLOAD_ARG_CNT];

What's the endianness of this payload? Is it little endian? Or do the
eemi_ops convert to CPU native endianness?

> +       int ret;
> +
> +       qdata.qid = PM_QID_CLOCK_GET_PARENTS;
> +       qdata.arg1 = clock_id;
> +       qdata.arg2 = index;
> +
> +       ret = eemi_ops->query_data(qdata, ret_payload);
> +       memcpy(parents, &ret_payload[1], CLK_GET_PARENTS_RESP_WORDS * 4);
> +
> +       return ret;
> +}
> +
> +/**
> + * zynqmp_pm_clock_get_attributes() - Get the attributes of clock for given id
> + * @clock_id:  Clock ID
> + * @attr:      Clock attributes
> + *
> + * This function is used to get clock's attributes(e.g. valid, clock type, etc).
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_pm_clock_get_attributes(u32 clock_id, u32 *attr)
> +{
> +       struct zynqmp_pm_query_data qdata = {0};
> +       u32 ret_payload[PAYLOAD_ARG_CNT];
> +       int ret;
> +
> +       qdata.qid = PM_QID_CLOCK_GET_ATTRIBUTES;
> +       qdata.arg1 = clock_id;
> +
> +       ret = eemi_ops->query_data(qdata, ret_payload);
> +       memcpy(attr, &ret_payload[1], CLK_GET_ATTR_RESP_WORDS * 4);
> +
> +       return ret;
> +}
> +
> +/**
> + * zynqmp_clock_get_topology() - Get topology of clock from firmware using
> + *                              PM_API
> + * @clk_id:            Clock index
> + * @clk_topology:      Structure of clock topology
> + * @num_nodes:         number of nodes
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_clock_get_topology(u32 clk_id,
> +                                    struct clock_topology *clk_topology,
> +                                    u32 *num_nodes)
> +{
> +       int j, k = 0, ret;
> +       u32 pm_resp[PM_API_PAYLOAD_LEN] = {0};
> +
> +       *num_nodes = 0;
> +       for (j = 0; j <= MAX_NODES; j += 3) {
> +               ret = zynqmp_pm_clock_get_topology(clk_id, j, pm_resp);
> +               if (ret)
> +                       return ret;
> +               for (k = 0; k < PM_API_PAYLOAD_LEN; k++) {
> +                       if (!(pm_resp[k] & CLK_TYPE_FIELD_MASK))
> +                               return 0;
> +                       clk_topology[*num_nodes].type = pm_resp[k] &
> +                                                       CLK_TYPE_FIELD_MASK;

When this line splitting happens it's a sign to make another subroutine.

> +                       clk_topology[*num_nodes].flag =
> +                                       FIELD_GET(CLK_FLAG_FIELD_MASK,
> +                                                 pm_resp[k]);
> +                       clk_topology[*num_nodes].type_flag =
> +                               FIELD_GET(CLK_TYPE_FLAG_FIELD_MASK,
> +                                         pm_resp[k]);
> +                       (*num_nodes)++;
> +               }
> +       }
> +       return 0;
> +}
> +
> +/**
> + * zynqmp_clock_get_parents() - Get parents info from firmware using PM_API
> + * @clk_id:            Clock index
> + * @parents:           Structure of parent information
> + * @num_parents:       Total number of parents
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_clock_get_parents(u32 clk_id, struct clock_parent *parents,
> +                                   u32 *num_parents)
> +{
> +       int j = 0, k, ret, total_parents = 0;
> +       u32 pm_resp[PM_API_PAYLOAD_LEN] = {0};
> +       struct clock_parent *parent;
> +
> +       do {
> +               /* Get parents from firmware */
> +               ret = zynqmp_pm_clock_get_parents(clk_id, j, pm_resp);
> +               if (ret)
> +                       return ret;
> +
> +               for (k = 0; k < PM_API_PAYLOAD_LEN; k++) {
> +                       if (pm_resp[k] == NA_PARENT) {
> +                               *num_parents = total_parents;
> +                               return 0;
> +                       }
> +
> +                       parent = &parents[k + j];
> +                       parent->id = pm_resp[k] & CLK_PARENTS_ID_MASK;
> +                       if (pm_resp[k] == DUMMY_PARENT) {
> +                               strcpy(parent->name, "dummy_name");
> +                               parent->flag = 0;
> +                       } else {
> +                               parent->flag = pm_resp[k] >>
> +                                                       CLK_PARENTS_ID_LEN;

Same comment. Function is too indented and long.

> +                               if (zynqmp_get_clock_name(parent->id,
> +                                                         parent->name))
> +                                       continue;
> +                       }
> +                       total_parents++;
> +               }
> +               j += PM_API_PAYLOAD_LEN;
> +       } while (total_parents <= MAX_PARENT);
> +       return 0;
> +}
> +
> +/**
> + * zynqmp_get_parent_list() - Create list of parents name
> + * @np:                        Device node
> + * @clk_id:            Clock index
> + * @parent_list:       List of parent's name
> + * @num_parents:       Total number of parents
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_get_parent_list(struct device_node *np, u32 clk_id,
> +                                 const char **parent_list, u32 *num_parents)
> +{
> +       int i = 0, ret;
> +       u32 total_parents = clock[clk_id].num_parents;
> +       struct clock_topology *clk_nodes;
> +       struct clock_parent *parents;
> +
> +       clk_nodes = clock[clk_id].node;
> +       parents = clock[clk_id].parent;
> +
> +       for (i = 0; i < total_parents; i++) {
> +               if (!parents[i].flag) {
> +                       parent_list[i] = parents[i].name;
> +               } else if (parents[i].flag == PARENT_CLK_EXTERNAL) {
> +                       ret = of_property_match_string(np, "clock-names",
> +                                                      parents[i].name);
> +                       if (ret < 0)
> +                               strcpy(parents[i].name, "dummy_name");
> +                       parent_list[i] = parents[i].name;
> +               } else {
> +                       strcat(parents[i].name,
> +                              clk_type_postfix[clk_nodes[parents[i].flag - 1].
> +                              type]);
> +                       parent_list[i] = parents[i].name;
> +               }
> +       }
> +
> +       *num_parents = total_parents;
> +       return 0;
> +}
> +
> +/**
> + * zynqmp_register_clk_topology() - Register clock topology
> + * @clk_id:            Clock index
> + * @clk_name:          Clock Name
> + * @num_parents:       Total number of parents
> + * @parent_names:      List of parents name
> + *
> + * Return: Returns either clock hardware or error+reason
> + */
> +static struct clk_hw *zynqmp_register_clk_topology(int clk_id, char *clk_name,
> +                                                  int num_parents,
> +                                                  const char **parent_names)
> +{
> +       int j, ret;
> +       u32 num_nodes, mult, div;
> +       char *clk_out = NULL;
> +       struct clock_topology *nodes;
> +       struct clk_hw *hw = NULL;
> +
> +       nodes = clock[clk_id].node;
> +       num_nodes = clock[clk_id].num_nodes;
> +
> +       for (j = 0; j < num_nodes; j++) {
> +               /*
> +                * Clock name received from firmware is output clock name.
> +                * Intermediate clock names are postfixed with type of clock.
> +                */
> +               if (j != (num_nodes - 1)) {
> +                       clk_out = kasprintf(GFP_KERNEL, "%s%s", clk_name,
> +                                           clk_type_postfix[nodes[j].type]);
> +               } else {
> +                       clk_out = kasprintf(GFP_KERNEL, "%s", clk_name);
> +               }
> +
> +               switch (nodes[j].type) {

Make this switchcase a function of its own.

> +               case TYPE_MUX:
> +                       hw = zynqmp_clk_register_mux(NULL, clk_out,
> +                                                    clk_id, parent_names,
> +                                                    num_parents,
> +                                                    nodes[j].flag,
> +                                                    nodes[j].type_flag);

Why not pass &nodes to all these registration functions? And then also
pass dev, clk_out, and clk_id each time? Then the switch statement could
practically become an array of function pointers that you call with the
same arguments based on the type.

> +                       break;
> +               case TYPE_PLL:
> +                       hw = zynqmp_clk_register_pll(NULL, clk_out, clk_id,
> +                                                    parent_names[0],
> +                                                    nodes[j].flag);
> +                       break;
> +               case TYPE_FIXEDFACTOR:
> +                       ret = zynqmp_pm_clock_get_fixedfactor_params(clk_id,
> +                                                                    &mult,
> +                                                                    &div);

And this could be folded into that function for the fixedfactor clks.

> +                       hw = clk_hw_register_fixed_factor(NULL, clk_out,
> +                                                         parent_names[0],
> +                                                         nodes[j].flag, mult,
> +                                                         div);
> +                       break;
> +               case TYPE_DIV1:
> +               case TYPE_DIV2:
> +                       hw = zynqmp_clk_register_divider(NULL, clk_out, clk_id,
> +                                                        nodes[j].type,
> +                                                        parent_names[0],
> +                                                        nodes[j].flag,
> +                                                        nodes[j].type_flag);
> +                       break;
> +               case TYPE_GATE:
> +
> +                       hw = zynqmp_clk_register_gate(NULL, clk_out, clk_id,
> +                                                     parent_names[0],
> +                                                     nodes[j].flag,
> +                                                     nodes[j].type_flag);
> +                       break;
> +               default:
> +                       pr_err("%s() Unknown topology for %s\n",
> +                              __func__, clk_out);
> +                       break;
> +               }
> +               if (IS_ERR(hw))
> +                       pr_warn_once("%s() %s register fail with %ld\n",
> +                                    __func__, clk_name, PTR_ERR(hw));
> +
> +               parent_names[0] = clk_out;
> +       }
> +       kfree(clk_out);
> +       return hw;
> +}
> +
> +/**
> + * zynqmp_register_clocks() - Register clocks
> + * @np:                Device node
> + *
> + * Return: 0 on success else error code
> + */
> +static int zynqmp_register_clocks(struct device_node *np)
> +{
> +       int ret;
> +       u32 i, total_parents = 0, type = 0;
> +       const char *parent_names[MAX_PARENT];
> +
> +       for (i = 0; i < clock_max_idx; i++) {
> +               char clk_name[MAX_NAME_LEN];
> +
> +               /* get clock name, continue to next clock if name not found */
> +               if (zynqmp_get_clock_name(i, clk_name))
> +                       continue;
> +
> +               /* Check if clock is valid and output clock.
> +                * Do not regiter invalid or external clock.

s/regiter/register/

> +                */
> +               ret = zynqmp_get_clock_type(i, &type);
> +               if (ret || type != CLK_TYPE_OUTPUT)
> +                       continue;
> +
> +               /* Get parents of clock*/
> +               if (zynqmp_get_parent_list(np, i, parent_names,
> +                                          &total_parents)) {
> +                       WARN_ONCE(1, "No parents found for %s\n",
> +                                 clock[i].clk_name);
> +                       continue;
> +               }
> +
> +               zynqmp_data->hws[i] =
> +                       zynqmp_register_clk_topology(i, clk_name,
> +                                                    total_parents,
> +                                                    parent_names);
> +       }
> +
> +       for (i = 0; i < clock_max_idx; i++) {
> +               if (IS_ERR(zynqmp_data->hws[i])) {
> +                       pr_err("Zynq Ultrascale+ MPSoC clk %s: register failed with %ld\n",
> +                              clock[i].clk_name, PTR_ERR(zynqmp_data->hws[i]));
> +                       WARN_ON(1);
> +               }
> +       }
> +       return 0;
> +}
> +
> +/**
> + * zynqmp_get_clock_info() - Get clock information from firmware using PM_API
> + */
> +static void zynqmp_get_clock_info(void)
> +{
> +       int i, ret;
> +       u32 attr, type = 0;
> +
> +       memset(clock, 0, sizeof(clock));
> +       for (i = 0; i < MAX_CLOCK; i++) {
> +               zynqmp_pm_clock_get_name(i, clock[i].clk_name);
> +               if (!strcmp(clock[i].clk_name, END_OF_CLK_NAME)) {
> +                       clock_max_idx = i;
> +                       break;
> +               } else if (!strcmp(clock[i].clk_name, RESERVED_CLK_NAME)) {
> +                       continue;
> +               }
> +
> +               ret = zynqmp_pm_clock_get_attributes(i, &attr);
> +               if (ret)
> +                       continue;
> +
> +               clock[i].valid = attr & CLK_VALID_MASK;
> +               clock[i].init_enable = !!(attr & CLK_INIT_ENABLE_MASK);
> +               clock[i].type = attr >> CLK_TYPE_SHIFT ? CLK_TYPE_EXTERNAL :
> +                                                       CLK_TYPE_OUTPUT;
> +       }
> +
> +       /* Get topology of all clock */
> +       for (i = 0; i < clock_max_idx; i++) {
> +               ret = zynqmp_get_clock_type(i, &type);
> +               if (ret || type != CLK_TYPE_OUTPUT)
> +                       continue;
> +
> +               ret = zynqmp_clock_get_topology(i, clock[i].node,
> +                                               &clock[i].num_nodes);
> +               if (ret)
> +                       continue;
> +
> +               ret = zynqmp_clock_get_parents(i, clock[i].parent,
> +                                              &clock[i].num_parents);
> +               if (ret)
> +                       continue;
> +       }
> +}
> +
> +/**
> + * zynqmp_validate_eemi_ops() - Validate eemi ops
> + *
> + * Return: 0 on success else error code
> + */
> +static inline int zynqmp_validate_eemi_ops(void)
> +{
> +       eemi_ops = zynqmp_pm_get_eemi_ops();
> +       if (!eemi_ops || !eemi_ops->query_data ||
> +           !eemi_ops->clock_setdivider ||
> +           !eemi_ops->clock_getdivider ||
> +           !eemi_ops->clock_setparent ||
> +           !eemi_ops->clock_getparent ||
> +           !eemi_ops->clock_getstate ||
> +           !eemi_ops->clock_disable ||
> +           !eemi_ops->clock_enable ||
> +           !eemi_ops->ioctl)
> +               return -ENXIO;
> +
> +       return 0;

Is this function really necessary? Firmware sometimes won't implement
the ops or something? Why is the driver probing in DT then?

> +}
> +
> +/**
> + * zynqmp_clk_setup() - Setup the clock framework and register clocks
> + * @np:                Device node
> + *
> + * Return: 0 on success else error code
> + */
> +static int __init zynqmp_clk_setup(struct device_node *np)
> +{
> +       int idx;
> +
> +       idx = of_property_match_string(np, "clock-names", "pss_ref_clk");
> +       if (idx < 0) {
> +               pr_err("pss_ref_clk not provided\n");
> +               return -ENOENT;
> +       }
> +       idx = of_property_match_string(np, "clock-names", "video_clk");
> +       if (idx < 0) {
> +               pr_err("video_clk not provided\n");
> +               return -ENOENT;
> +       }
> +       idx = of_property_match_string(np, "clock-names", "pss_alt_ref_clk");
> +       if (idx < 0) {
> +               pr_err("pss_alt_ref_clk not provided\n");
> +               return -ENOENT;
> +       }
> +       idx = of_property_match_string(np, "clock-names", "aux_ref_clk");
> +       if (idx < 0) {
> +               pr_err("aux_ref_clk not provided\n");
> +               return -ENOENT;
> +       }
> +       idx = of_property_match_string(np, "clock-names", "gt_crx_ref_clk");
> +       if (idx < 0) {
> +               pr_err("aux_ref_clk not provided\n");
> +               return -ENOENT;
> +       }

Seems like a lot of checking for things that could be checked statically
by some DT checker? Remove this unless it's doing something useful.

> +
> +       zynqmp_data = kzalloc(sizeof(*zynqmp_data) + sizeof(*zynqmp_data) *
> +                                               MAX_CLOCK, GFP_KERNEL);
> +       if (!zynqmp_data)
> +               return -ENOMEM;
> +
> +       zynqmp_get_clock_info();
> +       zynqmp_register_clocks(np);
> +
> +       zynqmp_data->num = clock_max_idx;
> +       of_clk_add_hw_provider(np, of_clk_hw_onecell_get, zynqmp_data);
> +
> +       return 0;
> +}
> +
> +/**
> + * zynqmp_clock_init() - Initialize zynqmp clocks
> + *
> + * Return: 0 on success else error code
> + */
> +static int __init zynqmp_clock_init(void)
> +{
> +       int ret;
> +       struct device_node *np;
> +
> +       np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp");
> +       if (!np)
> +               return -ENOENT;
> +       of_node_put(np);
> +
> +       np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp-clk");

Why can't this be a platform device driver?

> +       if (!np) {
> +               pr_err("%s: clk node not found\n", __func__);
> +               return -ENOENT;
> +       }
> +
> +       ret = zynqmp_validate_eemi_ops();
> +       if (ret) {
> +               pr_err("%s: eemi ops validation fail\n", __func__);
> +               of_node_put(np);
> +               return ret;
> +       }
> +
> +       ret = zynqmp_clk_setup(np);
> +       of_node_put(np);
> +
> +       return ret;
> +}
> +arch_initcall(zynqmp_clock_init);
> diff --git a/drivers/clk/zynqmp/divider.c b/drivers/clk/zynqmp/divider.c
> new file mode 100644
> index 0000000..ef3e2e9
> --- /dev/null
> +++ b/drivers/clk/zynqmp/divider.c
> @@ -0,0 +1,219 @@
[...]
> +
> +/**
> + * struct zynqmp_clk_divider - adjustable divider clock
> + * @hw:                handle between common and hardware-specific interfaces
> + * @flags:     Hardware specific flags
> + * @clk_id:    Id of clock
> + * @div_type:  divisor type (TYPE_DIV1 or TYPE_DIV2)
> + */
> +struct zynqmp_clk_divider {
> +       struct clk_hw hw;
> +       u8 flags;
> +       u32 clk_id;
> +       u32 div_type;
> +};
> +
> +static int zynqmp_divider_get_val(unsigned long parent_rate, unsigned long rate)
> +{
> +       return DIV_ROUND_CLOSEST(parent_rate, rate);

This is used once, why not just put it inline at the call site instead?

> +}
> +
> +/**
> + * zynqmp_clk_divider_recalc_rate() - Recalc rate of divider clock
> + * @hw:                        handle between common and hardware-specific interfaces
> + * @parent_rate:       rate of parent clock
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static unsigned long zynqmp_clk_divider_recalc_rate(struct clk_hw *hw,
> +                                                   unsigned long parent_rate)
> +{
> +       struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = divider->clk_id;
> +       u32 div_type = divider->div_type;
> +       u32 div, value;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       ret = eemi_ops->clock_getdivider(clk_id, &div);
> +
> +       if (ret)
> +               pr_warn_once("%s() get divider failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +
> +       if (div_type == TYPE_DIV1)
> +               value = div & 0xFFFF;
> +       else
> +               value = (div >> 16) & 0xFFFF;

div is u32, so masking with 16 bits after shifting it right by 16 does
nothing.

> +
> +       return DIV_ROUND_UP_ULL(parent_rate, value);
> +}
> +
> +/**
> + * zynqmp_clk_divider_round_rate() - Round rate of divider clock
> + * @hw:                        handle between common and hardware-specific interfaces
> + * @rate:              rate of clock to be set
> + * @prate:             rate of parent clock
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static long zynqmp_clk_divider_round_rate(struct clk_hw *hw,
> +                                         unsigned long rate,
> +                                         unsigned long *prate)
> +{
> +       struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = divider->clk_id;
> +       u32 div_type = divider->div_type;
> +       u32 bestdiv;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       /* if read only, just return current value */
> +       if (divider->flags & CLK_DIVIDER_READ_ONLY) {
> +               ret = eemi_ops->clock_getdivider(clk_id, &bestdiv);
> +
> +               if (ret)
> +                       pr_warn_once("%s() get divider failed for %s, ret = %d\n",
> +                                    __func__, clk_name, ret);
> +               if (div_type == TYPE_DIV1)
> +                       bestdiv = bestdiv & 0xFFFF;
> +               else
> +                       bestdiv  = (bestdiv >> 16) & 0xFFFF;
> +
> +               return DIV_ROUND_UP_ULL((u64)*prate, bestdiv);
> +       }
> +
> +       bestdiv = zynqmp_divider_get_val(*prate, rate);
> +
> +       if ((clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) &&
> +           (clk_hw_get_flags(hw) & CLK_FRAC))

We don't stuff implementation specific clk flags into the
clk_core::flags variable, so don't expect CLK_FRAC to come out of there
and be testable here.

> +               bestdiv = rate % *prate ? 1 : bestdiv;
> +       *prate = rate * bestdiv;
> +
> +       return rate;
> +}
> +
[...]
> diff --git a/drivers/clk/zynqmp/pll.c b/drivers/clk/zynqmp/pll.c
> new file mode 100644
> index 0000000..1782829
> --- /dev/null
> +++ b/drivers/clk/zynqmp/pll.c
> @@ -0,0 +1,345 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Zynq UltraScale+ MPSoC PLL driver
> + *
> + *  Copyright (C) 2016-2018 Xilinx
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/slab.h>
> +#include "clk-zynqmp.h"
> +
> +/**
> + * struct zynqmp_pll - Structure for PLL clock
> + * @hw:                Handle between common and hardware-specific interfaces
> + * @clk_id:    PLL clock ID
> + */
> +struct zynqmp_pll {
> +       struct clk_hw hw;
> +       u32 clk_id;
> +};
> +
> +#define to_zynqmp_pll(_hw)     container_of(_hw, struct zynqmp_pll, hw)
> +
> +#define PLL_FBDIV_MIN  25
> +#define PLL_FBDIV_MAX  125
> +
> +#define PS_PLL_VCO_MIN 1500000000
> +#define PS_PLL_VCO_MAX 3000000000UL
> +
> +enum pll_mode {
> +       PLL_MODE_INT,
> +       PLL_MODE_FRAC,
> +};
> +
> +#define FRAC_OFFSET 0x8
> +#define PLLFCFG_FRAC_EN        BIT(31)
> +#define FRAC_DIV  BIT(16)  /* 2^16 */
> +
> +/**
> + * zynqmp_pll_get_mode() - Get mode of PLL
> + * @hw:                Handle between common and hardware-specific interfaces
> + *
> + * Return: Mode of PLL
> + */
> +static inline enum pll_mode zynqmp_pll_get_mode(struct clk_hw *hw)
> +{
> +       struct zynqmp_pll *clk = to_zynqmp_pll(hw);
> +       u32 clk_id = clk->clk_id;
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 ret_payload[PAYLOAD_ARG_CNT];
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       ret = eemi_ops->ioctl(0, IOCTL_GET_PLL_FRAC_MODE, clk_id, 0,
> +                             ret_payload);
> +       if (ret)
> +               pr_warn_once("%s() PLL get frac mode failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +
> +       return ret_payload[1];
> +}
> +
> +/**
> + * zynqmp_pll_set_mode() - Set the PLL mode
> + * @hw:                Handle between common and hardware-specific interfaces
> + * @on:                Flag to determine the mode
> + */
> +static inline void zynqmp_pll_set_mode(struct clk_hw *hw, bool on)
> +{
> +       struct zynqmp_pll *clk = to_zynqmp_pll(hw);
> +       u32 clk_id = clk->clk_id;
> +       const char *clk_name = clk_hw_get_name(hw);
> +       int ret;
> +       u32 mode;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       if (on)
> +               mode = PLL_MODE_FRAC;
> +       else
> +               mode = PLL_MODE_INT;
> +
> +       ret = eemi_ops->ioctl(0, IOCTL_SET_PLL_FRAC_MODE, clk_id, mode, NULL);
> +       if (ret)
> +               pr_warn_once("%s() PLL set frac mode failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +}
> +
> +/**
> + * zynqmp_pll_round_rate() - Round a clock frequency
> + * @hw:                Handle between common and hardware-specific interfaces
> + * @rate:      Desired clock frequency
> + * @prate:     Clock frequency of parent clock
> + *
> + * Return: Frequency closest to @rate the hardware can generate
> + */
> +static long zynqmp_pll_round_rate(struct clk_hw *hw, unsigned long rate,
> +                                 unsigned long *prate)
> +{
> +       u32 fbdiv;
> +       long rate_div, f;
> +
> +       /* Enable the fractional mode if needed */
> +       rate_div = (rate * FRAC_DIV) / *prate;
> +       f = rate_div % FRAC_DIV;
> +       zynqmp_pll_set_mode(hw, !!f);
> +
> +       if (zynqmp_pll_get_mode(hw) == PLL_MODE_FRAC) {
> +               if (rate > PS_PLL_VCO_MAX) {
> +                       fbdiv = rate / PS_PLL_VCO_MAX;
> +                       rate = rate / (fbdiv + 1);
> +               }
> +               if (rate < PS_PLL_VCO_MIN) {
> +                       fbdiv = DIV_ROUND_UP(PS_PLL_VCO_MIN, rate);
> +                       rate = rate * fbdiv;
> +               }
> +               return rate;
> +       }
> +
> +       fbdiv = DIV_ROUND_CLOSEST(rate, *prate);
> +       fbdiv = clamp_t(u32, fbdiv, PLL_FBDIV_MIN, PLL_FBDIV_MAX);
> +       return *prate * fbdiv;
> +}
> +
> +/**
> + * zynqmp_pll_recalc_rate() - Recalculate clock frequency
> + * @hw:                        Handle between common and hardware-specific interfaces
> + * @parent_rate:       Clock frequency of parent clock
> + *
> + * Return: Current clock frequency
> + */
> +static unsigned long zynqmp_pll_recalc_rate(struct clk_hw *hw,
> +                                           unsigned long parent_rate)
> +{
> +       struct zynqmp_pll *clk = to_zynqmp_pll(hw);
> +       u32 clk_id = clk->clk_id;
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 fbdiv, data;
> +       unsigned long rate, frac;
> +       u32 ret_payload[PAYLOAD_ARG_CNT];
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       /*
> +        * makes probably sense to redundantly save fbdiv in the struct
> +        * zynqmp_pll to save the IO access.

Is this a TODO? Doesn't make sense to me because caching things for
recalc rate is painful to get right. Please remove this comment.

> +        */
> +       ret = eemi_ops->clock_getdivider(clk_id, &fbdiv);
> +       if (ret)
> +               pr_warn_once("%s() get divider failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +
> +       rate =  parent_rate * fbdiv;
> +       if (zynqmp_pll_get_mode(hw) == PLL_MODE_FRAC) {
> +               eemi_ops->ioctl(0, IOCTL_GET_PLL_FRAC_DATA, clk_id, 0,
> +                               ret_payload);
> +               data = ret_payload[1];
> +               frac = (parent_rate * data) / FRAC_DIV;
> +               rate = rate + frac;
> +       }
> +
> +       return rate;
> +}
> +
> +/**
> + * zynqmp_pll_set_rate() - Set rate of PLL
> + * @hw:                        Handle between common and hardware-specific interfaces
> + * @rate:              Frequency of clock to be set
> + * @parent_rate:       Clock frequency of parent clock
> + *
> + * Set PLL divider to set desired rate.
> + *
> + * Returns:            rate which is set on success else error code
> + */
> +static int zynqmp_pll_set_rate(struct clk_hw *hw, unsigned long rate,
> +                              unsigned long parent_rate)
> +{
> +       struct zynqmp_pll *clk = to_zynqmp_pll(hw);
> +       u32 clk_id = clk->clk_id;
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 fbdiv, data;
> +       long rate_div, frac, m, f;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       if (zynqmp_pll_get_mode(hw) == PLL_MODE_FRAC) {
> +               rate_div = ((rate * FRAC_DIV) / parent_rate);

Too many parenthesis.

> +               m = rate_div / FRAC_DIV;
> +               f = rate_div % FRAC_DIV;
> +               m = clamp_t(u32, m, (PLL_FBDIV_MIN), (PLL_FBDIV_MAX));
> +               rate = parent_rate * m;
> +               frac = (parent_rate * f) / FRAC_DIV;
> +
> +               ret = eemi_ops->clock_setdivider(clk_id, m);
> +               if (ret)
> +                       pr_warn_once("%s() set divider failed for %s, ret = %d\n",
> +                                    __func__, clk_name, ret);
> +
> +               data = (FRAC_DIV * f) / FRAC_DIV;

Feels like there must be some macro for this idiom but I failed to find
it. round_something()?

> +               eemi_ops->ioctl(0, IOCTL_SET_PLL_FRAC_DATA, clk_id, data, NULL);
> +
> +               return rate + frac;
> +       }
> +
> +       fbdiv = DIV_ROUND_CLOSEST(rate, parent_rate);
> +       fbdiv = clamp_t(u32, fbdiv, PLL_FBDIV_MIN, PLL_FBDIV_MAX);
> +       ret = eemi_ops->clock_setdivider(clk_id, fbdiv);
> +       if (ret)
> +               pr_warn_once("%s() set divider failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +
> +       return parent_rate * fbdiv;
> +}
> +
> +/**
> + * zynqmp_pll_is_enabled() - Check if a clock is enabled
> + * @hw:                Handle between common and hardware-specific interfaces
> + *
> + * Return: 1 if the clock is enabled, 0 otherwise
> + */
> +static int zynqmp_pll_is_enabled(struct clk_hw *hw)
> +{
> +       struct zynqmp_pll *clk = to_zynqmp_pll(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = clk->clk_id;
> +       unsigned int state;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       ret = eemi_ops->clock_getstate(clk_id, &state);
> +       if (ret) {
> +               pr_warn_once("%s() clock get state failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +               return -EIO;
> +       }
> +
> +       return state ? 1 : 0;
> +}
> +
> +/**
> + * zynqmp_pll_enable() - Enable clock
> + * @hw:                Handle between common and hardware-specific interfaces
> + *
> + * Return: 0 on success else error code
> + */
> +static int zynqmp_pll_enable(struct clk_hw *hw)
> +{
> +       struct zynqmp_pll *clk = to_zynqmp_pll(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = clk->clk_id;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       if (zynqmp_pll_is_enabled(hw))
> +               return 0;
> +
> +       pr_info("PLL: enable\n");

No.

> +
> +       ret = eemi_ops->clock_enable(clk_id);
> +       if (ret)
> +               pr_warn_once("%s() clock enable failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +
> +       return ret;
> +}
> +
> +/**
> + * zynqmp_pll_disable() - Disable clock
> + * @hw:                Handle between common and hardware-specific interfaces
> + */
> +static void zynqmp_pll_disable(struct clk_hw *hw)
> +{
> +       struct zynqmp_pll *clk = to_zynqmp_pll(hw);
> +       const char *clk_name = clk_hw_get_name(hw);
> +       u32 clk_id = clk->clk_id;
> +       int ret;
> +       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> +
> +       if (!zynqmp_pll_is_enabled(hw))
> +               return;
> +
> +       pr_info("PLL: shutdown\n");

No.

> +
> +       ret = eemi_ops->clock_disable(clk_id);
> +       if (ret)
> +               pr_warn_once("%s() clock disable failed for %s, ret = %d\n",
> +                            __func__, clk_name, ret);
> +}
> +
> +static const struct clk_ops zynqmp_pll_ops = {
> +       .enable = zynqmp_pll_enable,
> +       .disable = zynqmp_pll_disable,
> +       .is_enabled = zynqmp_pll_is_enabled,
> +       .round_rate = zynqmp_pll_round_rate,
> +       .recalc_rate = zynqmp_pll_recalc_rate,
> +       .set_rate = zynqmp_pll_set_rate,
> +};
> +
> +/**
> + * zynqmp_clk_register_pll() - Register PLL with the clock framework
> + * @dev:       Device pointer
> + * @name:      PLL name
> + * @clk_id:    Clock ID
> + * @parent:    Parent clock name
> + * @flag:      PLL flgas
> + *
> + * Return: clock hardware to the registered clock
> + */
> +struct clk_hw *zynqmp_clk_register_pll(struct device *dev, const char *name,
> +                                      u32 clk_id,
> +                                      const char *parent,
> +                                      unsigned long flag)
> +{
> +       struct zynqmp_pll *pll;
> +       struct clk_hw *hw;
> +       struct clk_init_data init;
> +       int ret;
> +
> +       init.name = name;
> +       init.ops = &zynqmp_pll_ops;
> +       init.flags = flag;
> +       init.parent_names = &parent;
> +       init.num_parents = 1;
> +
> +       pll = kmalloc(sizeof(*pll), GFP_KERNEL);

Why kmalloc instead of kzalloc?

> +       if (!pll)
> +               return ERR_PTR(-ENOMEM);
> +
> +       /* Populate the struct */

Yes. That's a useless comment.

> +       pll->hw.init = &init;
> +       pll->clk_id = clk_id;
> +
> +       hw = &pll->hw;
> +       ret = clk_hw_register(dev, hw);
> +       if (ret) {
> +               kfree(pll);
> +               return ERR_PTR(ret);
> +       }
> +
> +       clk_hw_set_rate_range(hw, PS_PLL_VCO_MIN, PS_PLL_VCO_MAX);

Why is this necessary?

> +       if (ret < 0)
> +               pr_err("%s:ERROR clk_set_rate_range failed %d\n", name, ret);
> +
> +       return hw;
> +}
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Jolly Shah July 17, 2018, 8:09 p.m. UTC | #2

Hi Stephen,

Thanks for the review,

> -----Original Message-----

> From: Stephen Boyd [mailto:[e-mail]]

> Sent: Sunday, July 08, 2018 10:27 PM

> To: Jolly Shah <[e-mail]>; [e-mail];

> [e-mail]; [e-mail];

> [e-mail]; [e-mail]; [e-mail];

> [e-mail]; [e-mail]; Michal Simek

> <[e-mail]>; [e-mail]; [e-mail];

> [e-mail]; [e-mail]; [e-mail]

> Cc: Rajan Vaja <[e-mail]>; [e-mail];

> [e-mail]; [e-mail]; Jolly Shah

> <[e-mail]>; Tejas Patel <[e-mail]>; Shubhrajyoti Datta

> <[e-mail]>; Jolly Shah <[e-mail]>

> Subject: Re: [PATCH v9 10/10] drivers: clk: Add ZynqMP clock driver

> 

> > +/**

> > + * zynqmp_pm_clock_get_parents() - Get the first 3 parents of clock for given

> id

> > + * @clock_id:  Clock ID

> > + * @index:     Parent index

> > + * @parents:   3 parents of the given clock

> > + *

> > + * This function is used to get 3 parents for the clock specified by

> > + * given clock ID.

> > + *

> > + * This API will return 3 parents with a single response. To get

> > + * other parents, master should call same API in loop with new

> > + * parent index till error is returned. E.g First call should have

> > + * index 0 which will return parents 0,1 and 2. Next call, index

> > + * should be 3 which will return parent 3,4 and 5 and so on.

> > + *

> > + * Return: Returns status, either success or error+reason

> > + */

> > +static int zynqmp_pm_clock_get_parents(u32 clock_id, u32 index, u32

> *parents)

> > +{

> > +       struct zynqmp_pm_query_data qdata = {0};

> > +       u32 ret_payload[PAYLOAD_ARG_CNT];

> 

> What's the endianness of this payload? Is it little endian? Or do the

> eemi_ops convert to CPU native endianness?


Its little endian

> > +

> > +/**

> > + * zynqmp_clock_init() - Initialize zynqmp clocks

> > + *

> > + * Return: 0 on success else error code

> > + */

> > +static int __init zynqmp_clock_init(void)

> > +{

> > +       int ret;

> > +       struct device_node *np;

> > +

> > +       np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp");

> > +       if (!np)

> > +               return -ENOENT;

> > +       of_node_put(np);

> > +

> > +       np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp-clk");

> 

> Why can't this be a platform device driver?


Platform driver may probe later(an actually probing later in our case). This will results in clock get failure in clock consumer peripherals. So clock registration needs to be done earlier.

> 

> > +               m = rate_div / FRAC_DIV;

> > +               f = rate_div % FRAC_DIV;

> > +               m = clamp_t(u32, m, (PLL_FBDIV_MIN), (PLL_FBDIV_MAX));

> > +               rate = parent_rate * m;

> > +               frac = (parent_rate * f) / FRAC_DIV;

> > +

> > +               ret = eemi_ops->clock_setdivider(clk_id, m);

> > +               if (ret)

> > +                       pr_warn_once("%s() set divider failed for %s, ret = %d\n",

> > +                                    __func__, clk_name, ret);

> > +

> > +               data = (FRAC_DIV * f) / FRAC_DIV;

> 

> Feels like there must be some macro for this idiom but I failed to find

> it. round_something()?

It was not needed. Removed in v10.

> 

> > +       pll->hw.init = &init;

> > +       pll->clk_id = clk_id;

> > +

> > +       hw = &pll->hw;

> > +       ret = clk_hw_register(dev, hw);

> > +       if (ret) {

> > +               kfree(pll);

> > +               return ERR_PTR(ret);

> > +       }

> > +

> > +       clk_hw_set_rate_range(hw, PS_PLL_VCO_MIN, PS_PLL_VCO_MAX);

> 

> Why is this necessary?

This is range of rate supported by hardware for PLL.

> 

> > +       if (ret < 0)

> > +               pr_err("%s:ERROR clk_set_rate_range failed %d\n", name, ret);

> > +

> > +       return hw;

> > +}



Rest all comments taken care in v10 series(posted today). 

Thanks,
Jolly Shah

Stephen Boyd July 25, 2018, 7:48 p.m. UTC | #3

Quoting Jolly Shah (2018-07-17 13:09:01)
> Hi Stephen,
> 
> Thanks for the review,
> 
> > -----Original Message-----
> > From: Stephen Boyd [mailto:[e-mail]]
> > Sent: Sunday, July 08, 2018 10:27 PM
> > To: Jolly Shah <[e-mail]>; [e-mail];
> > [e-mail]; [e-mail];
> > [e-mail]; [e-mail]; [e-mail];
> > [e-mail]; [e-mail]; Michal Simek
> > <[e-mail]>; [e-mail]; [e-mail];
> > [e-mail]; [e-mail]; [e-mail]
> > Cc: Rajan Vaja <[e-mail]>; [e-mail];
> > [e-mail]; [e-mail]; Jolly Shah
> > <[e-mail]>; Tejas Patel <[e-mail]>; Shubhrajyoti Datta
> > <[e-mail]>; Jolly Shah <[e-mail]>
> > Subject: Re: [PATCH v9 10/10] drivers: clk: Add ZynqMP clock driver
> > 
> > > +/**
> > > + * zynqmp_pm_clock_get_parents() - Get the first 3 parents of clock for given
> > id
> > > + * @clock_id:  Clock ID
> > > + * @index:     Parent index
> > > + * @parents:   3 parents of the given clock
> > > + *
> > > + * This function is used to get 3 parents for the clock specified by
> > > + * given clock ID.
> > > + *
> > > + * This API will return 3 parents with a single response. To get
> > > + * other parents, master should call same API in loop with new
> > > + * parent index till error is returned. E.g First call should have
> > > + * index 0 which will return parents 0,1 and 2. Next call, index
> > > + * should be 3 which will return parent 3,4 and 5 and so on.
> > > + *
> > > + * Return: Returns status, either success or error+reason
> > > + */
> > > +static int zynqmp_pm_clock_get_parents(u32 clock_id, u32 index, u32
> > *parents)
> > > +{
> > > +       struct zynqmp_pm_query_data qdata = {0};
> > > +       u32 ret_payload[PAYLOAD_ARG_CNT];
> > 
> > What's the endianness of this payload? Is it little endian? Or do the
> > eemi_ops convert to CPU native endianness?
> 
> Its little endian

Is it CPU native? This might need to be marked as __le32 for proper
endianess code.

> 
> > > +
> > > +/**
> > > + * zynqmp_clock_init() - Initialize zynqmp clocks
> > > + *
> > > + * Return: 0 on success else error code
> > > + */
> > > +static int __init zynqmp_clock_init(void)
> > > +{
> > > +       int ret;
> > > +       struct device_node *np;
> > > +
> > > +       np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp");
> > > +       if (!np)
> > > +               return -ENOENT;
> > > +       of_node_put(np);
> > > +
> > > +       np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp-clk");
> > 
> > Why can't this be a platform device driver?
> 
> Platform driver may probe later(an actually probing later in our case). This will results in clock get failure in clock consumer peripherals. So clock registration needs to be done earlier.

That's fine though? If a clk_get() fails because the provider isn't
registered yet the consumer will see -EPROBE_DEFER and try again later.

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Jolly Shah Aug. 3, 2018, 5:57 p.m. UTC | #4

Hi Stephen,

> -----Original Message-----
> From: Stephen Boyd [mailto:[e-mail]]
> Sent: Wednesday, July 25, 2018 12:49 PM
> To: [e-mail]; [e-mail];
> [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail];
> [e-mail]; [e-mail]; [e-mail]; Jolly
> Shah <[e-mail]>; Michal Simek <[e-mail]>
> Cc: [e-mail]; Tejas Patel <[e-mail]>; linux-
> [e-mail]; Rajan Vaja <[e-mail]>; Shubhrajyoti Datta
> <[e-mail]>; [e-mail]
> Subject: RE: [PATCH v9 10/10] drivers: clk: Add ZynqMP clock driver
> 
> Quoting Jolly Shah (2018-07-17 13:09:01)
> > Hi Stephen,
> >
> > Thanks for the review,
> >
> > > -----Original Message-----
> > > From: Stephen Boyd [mailto:[e-mail]]
> > > Sent: Sunday, July 08, 2018 10:27 PM
> > > To: Jolly Shah <[e-mail]>; [e-mail];
> > > [e-mail]; [e-mail];
> > > [e-mail]; [e-mail];
> > > [e-mail]; [e-mail];
> > > [e-mail]; Michal Simek <[e-mail]>;
> > > [e-mail]; [e-mail];
> > > [e-mail]; [e-mail]; [e-mail]
> > > Cc: Rajan Vaja <[e-mail]>;
> > > [e-mail];
> > > [e-mail]; [e-mail]; Jolly Shah
> > > <[e-mail]>; Tejas Patel <[e-mail]>; Shubhrajyoti
> > > Datta <[e-mail]>; Jolly Shah <[e-mail]>
> > > Subject: Re: [PATCH v9 10/10] drivers: clk: Add ZynqMP clock driver
> > >
> > > > +/**
> > > > + * zynqmp_pm_clock_get_parents() - Get the first 3 parents of
> > > > +clock for given
> > > id
> > > > + * @clock_id:  Clock ID
> > > > + * @index:     Parent index
> > > > + * @parents:   3 parents of the given clock
> > > > + *
> > > > + * This function is used to get 3 parents for the clock specified
> > > > +by
> > > > + * given clock ID.
> > > > + *
> > > > + * This API will return 3 parents with a single response. To get
> > > > + * other parents, master should call same API in loop with new
> > > > + * parent index till error is returned. E.g First call should
> > > > +have
> > > > + * index 0 which will return parents 0,1 and 2. Next call, index
> > > > + * should be 3 which will return parent 3,4 and 5 and so on.
> > > > + *
> > > > + * Return: Returns status, either success or error+reason  */
> > > > +static int zynqmp_pm_clock_get_parents(u32 clock_id, u32 index,
> > > > +u32
> > > *parents)
> > > > +{
> > > > +       struct zynqmp_pm_query_data qdata = {0};
> > > > +       u32 ret_payload[PAYLOAD_ARG_CNT];
> > >
> > > What's the endianness of this payload? Is it little endian? Or do
> > > the eemi_ops convert to CPU native endianness?
> >
> > Its little endian
> 
> Is it CPU native? This might need to be marked as __le32 for proper endianess
> code.
> 

Fixed in v11 series(posted today).

> >
> > > > +
> > > > +/**
> > > > + * zynqmp_clock_init() - Initialize zynqmp clocks
> > > > + *
> > > > + * Return: 0 on success else error code  */ static int __init
> > > > +zynqmp_clock_init(void) {
> > > > +       int ret;
> > > > +       struct device_node *np;
> > > > +
> > > > +       np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp");
> > > > +       if (!np)
> > > > +               return -ENOENT;
> > > > +       of_node_put(np);
> > > > +
> > > > +       np = of_find_compatible_node(NULL, NULL,
> > > > + "xlnx,zynqmp-clk");
> > >
> > > Why can't this be a platform device driver?
> >
> > Platform driver may probe later(an actually probing later in our case). This will
> results in clock get failure in clock consumer peripherals. So clock registration
> needs to be done earlier.
> 
> That's fine though? If a clk_get() fails because the provider isn't registered yet
> the consumer will see -EPROBE_DEFER and try again later.

You are right. Replaced init with platform driver probe in v11 series(posted today).

Thanks,
Jolly Shah

Patch

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 98ce9fc..a2ebcf7 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -252,6 +252,7 @@  source "drivers/clk/sprd/Kconfig"
 source "drivers/clk/sunxi-ng/Kconfig"
 source "drivers/clk/tegra/Kconfig"
 source "drivers/clk/ti/Kconfig"
+source "drivers/clk/zynqmp/Kconfig"
 source "drivers/clk/uniphier/Kconfig"
 
 endmenu
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 71ec41e..b6ac0d2 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -100,3 +100,4 @@  obj-$(CONFIG_X86)			+= x86/
 endif
 obj-$(CONFIG_ARCH_ZX)			+= zte/
 obj-$(CONFIG_ARCH_ZYNQ)			+= zynq/
+obj-$(CONFIG_COMMON_CLK_ZYNQMP)         += zynqmp/
diff --git a/drivers/clk/zynqmp/Kconfig b/drivers/clk/zynqmp/Kconfig
new file mode 100644
index 0000000..0f8986c
--- /dev/null
+++ b/drivers/clk/zynqmp/Kconfig
@@ -0,0 +1,11 @@ 
+# SPDX-License-Identifier: GPL-2.0
+
+config COMMON_CLK_ZYNQMP
+	bool "Support for Xilinx ZynqMP Ultrascale+ clock controllers"
+	depends on OF
+	depends on ARCH_ZYNQMP || COMPILE_TEST
+	depends on ZYNQMP_FIRMWARE
+	help
+	  Support for the Zynqmp Ultrascale clock controller.
+	  It has a dependency on the PMU firmware.
+	  Say Y if you want to include clock support.
diff --git a/drivers/clk/zynqmp/Makefile b/drivers/clk/zynqmp/Makefile
new file mode 100644
index 0000000..0ec24bf
--- /dev/null
+++ b/drivers/clk/zynqmp/Makefile
@@ -0,0 +1,4 @@ 
+# SPDX-License-Identifier: GPL-2.0
+# Zynq Ultrascale+ MPSoC clock specific Makefile
+
+obj-$(CONFIG_ARCH_ZYNQMP)	+= pll.o clk-gate-zynqmp.o divider.o clk-mux-zynqmp.o clkc.o
diff --git a/drivers/clk/zynqmp/clk-gate-zynqmp.c b/drivers/clk/zynqmp/clk-gate-zynqmp.c
new file mode 100644
index 0000000..b927eb1
--- /dev/null
+++ b/drivers/clk/zynqmp/clk-gate-zynqmp.c
@@ -0,0 +1,146 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Zynq UltraScale+ MPSoC clock controller
+ *
+ *  Copyright (C) 2016-2018 Xilinx
+ *
+ * Gated clock implementation
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include "clk-zynqmp.h"
+
+/**
+ * struct clk_gate - gating clock
+ * @hw:		handle between common and hardware-specific interfaces
+ * @flags:	hardware-specific flags
+ * @clk_id:	Id of clock
+ */
+struct zynqmp_clk_gate {
+	struct clk_hw hw;
+	u8 flags;
+	u32 clk_id;
+};
+
+#define to_zynqmp_clk_gate(_hw) container_of(_hw, struct zynqmp_clk_gate, hw)
+
+/**
+ * zynqmp_clk_gate_enable() - Enable clock
+ * @hw:		handle between common and hardware-specific interfaces
+ *
+ * Return: 0 on success else error code
+ */
+static int zynqmp_clk_gate_enable(struct clk_hw *hw)
+{
+	struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = gate->clk_id;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->clock_enable(clk_id);
+
+	if (ret)
+		pr_warn_once("%s() clock enabled failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	return ret;
+}
+
+/*
+ * zynqmp_clk_gate_disable() - Disable clock
+ * @hw:		handle between common and hardware-specific interfaces
+ */
+static void zynqmp_clk_gate_disable(struct clk_hw *hw)
+{
+	struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = gate->clk_id;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->clock_disable(clk_id);
+
+	if (ret)
+		pr_warn_once("%s() clock disable failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+}
+
+/**
+ * zynqmp_clk_gate_is_enable() - Check clock state
+ * @hw:		handle between common and hardware-specific interfaces
+ *
+ * Return: 1 if enabled, 0 if disabled else error code
+ */
+static int zynqmp_clk_gate_is_enabled(struct clk_hw *hw)
+{
+	struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = gate->clk_id;
+	int state, ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->clock_getstate(clk_id, &state);
+	if (ret) {
+		pr_warn_once("%s() clock get state failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+		return -EIO;
+	}
+
+	return state ? 1 : 0;
+}
+
+const struct clk_ops zynqmp_clk_gate_ops = {
+	.enable = zynqmp_clk_gate_enable,
+	.disable = zynqmp_clk_gate_disable,
+	.is_enabled = zynqmp_clk_gate_is_enabled,
+};
+EXPORT_SYMBOL_GPL(zynqmp_clk_gate_ops);
+
+/**
+ * zynqmp_clk_register_gate() - register a gate clock with the clock framework
+ * @dev:		device that is registering this clock
+ * @name:		name of this clock
+ * @clk_id:		Id of this clock
+ * @parent:		name of this clock's parent
+ * @flags:		framework-specific flags for this clock
+ * @clk_gate_flags:	gate-specific flags for this clock
+ *
+ * Return: clock hardware of the registered clock gate
+ */
+struct clk_hw *zynqmp_clk_register_gate(struct device *dev, const char *name,
+					u32 clk_id, const char *parent,
+					unsigned long flags,
+					u8 clk_gate_flags)
+{
+	struct zynqmp_clk_gate *gate;
+	struct clk_hw *hw;
+	int ret;
+	struct clk_init_data init;
+
+	/* allocate the gate */
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &zynqmp_clk_gate_ops;
+	init.flags = flags;
+	init.parent_names = &parent;
+	init.num_parents = 1;
+
+	/* struct clk_gate assignments */
+	gate->flags = clk_gate_flags;
+	gate->hw.init = &init;
+	gate->clk_id = clk_id;
+
+	hw = &gate->hw;
+	ret = clk_hw_register(dev, hw);
+	if (ret) {
+		kfree(gate);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
diff --git a/drivers/clk/zynqmp/clk-mux-zynqmp.c b/drivers/clk/zynqmp/clk-mux-zynqmp.c
new file mode 100644
index 0000000..a0b452d
--- /dev/null
+++ b/drivers/clk/zynqmp/clk-mux-zynqmp.c
@@ -0,0 +1,150 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Zynq UltraScale+ MPSoC mux
+ *
+ *  Copyright (C) 2016-2018 Xilinx
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include "clk-zynqmp.h"
+
+/*
+ * DOC: basic adjustable multiplexer clock that cannot gate
+ *
+ * Traits of this clock:
+ * prepare - clk_prepare only ensures that parents are prepared
+ * enable - clk_enable only ensures that parents are enabled
+ * rate - rate is only affected by parent switching.  No clk_set_rate support
+ * parent - parent is adjustable through clk_set_parent
+ */
+
+/**
+ * struct zynqmp_clk_mux - multiplexer clock
+ *
+ * @hw:		handle between common and hardware-specific interfaces
+ * @flags:	hardware-specific flags
+ * @clk_id:	Id of clock
+ */
+struct zynqmp_clk_mux {
+	struct clk_hw hw;
+	u8 flags;
+	u32 clk_id;
+};
+
+#define to_zynqmp_clk_mux(_hw) container_of(_hw, struct zynqmp_clk_mux, hw)
+
+/**
+ * zynqmp_clk_mux_get_parent() - Get parent of clock
+ * @hw:		handle between common and hardware-specific interfaces
+ *
+ * Return: Parent index
+ */
+static u8 zynqmp_clk_mux_get_parent(struct clk_hw *hw)
+{
+	struct zynqmp_clk_mux *mux = to_zynqmp_clk_mux(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = mux->clk_id;
+	u32 val;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->clock_getparent(clk_id, &val);
+
+	if (ret)
+		pr_warn_once("%s() getparent failed for clock: %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	return val;
+}
+
+/**
+ * zynqmp_clk_mux_set_parent() - Set parent of clock
+ * @hw:		handle between common and hardware-specific interfaces
+ * @index:	Parent index
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_clk_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct zynqmp_clk_mux *mux = to_zynqmp_clk_mux(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = mux->clk_id;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->clock_setparent(clk_id, index);
+
+	if (ret)
+		pr_warn_once("%s() set parent failed for clock: %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	return ret;
+}
+
+const struct clk_ops zynqmp_clk_mux_ops = {
+	.get_parent = zynqmp_clk_mux_get_parent,
+	.set_parent = zynqmp_clk_mux_set_parent,
+	.determine_rate = __clk_mux_determine_rate,
+};
+EXPORT_SYMBOL_GPL(zynqmp_clk_mux_ops);
+
+const struct clk_ops zynqmp_clk_mux_ro_ops = {
+	.get_parent = zynqmp_clk_mux_get_parent,
+};
+EXPORT_SYMBOL_GPL(zynqmp_clk_mux_ro_ops);
+
+/**
+ * zynqmp_clk_register_mux() - register a mux table with the clock
+ *			       framework
+ * @dev:		device that is registering this clock
+ * @name:		name of this clock
+ * @clk_id:		Id of this clock
+ * @parents:		name of this clock's parents
+ * @num_parents:	number of parents
+ * @flags:		framework-specific flags for this clock
+ * @clk_mux_flags:	mux-specific flags for this clock
+ *
+ * Return: clock hardware of the registered clock mux
+ */
+struct clk_hw *zynqmp_clk_register_mux(struct device *dev, const char *name,
+				       u32 clk_id,
+				       const char * const *parents,
+				       u8 num_parents,
+				       unsigned long flags,
+				       u8 clk_mux_flags)
+{
+	struct zynqmp_clk_mux *mux;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	/* allocate the mux */
+	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+	if (!mux)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	if (clk_mux_flags & CLK_MUX_READ_ONLY)
+		init.ops = &zynqmp_clk_mux_ro_ops;
+	else
+		init.ops = &zynqmp_clk_mux_ops;
+	init.flags = flags;
+	init.parent_names = parents;
+	init.num_parents = num_parents;
+
+	/* struct clk_mux assignments */
+	mux->flags = clk_mux_flags;
+	mux->hw.init = &init;
+	mux->clk_id = clk_id;
+
+	hw = &mux->hw;
+	ret = clk_hw_register(dev, hw);
+	if (ret) {
+		kfree(hw);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+EXPORT_SYMBOL_GPL(zynqmp_clk_register_mux);
diff --git a/drivers/clk/zynqmp/clk-zynqmp.h b/drivers/clk/zynqmp/clk-zynqmp.h
new file mode 100644
index 0000000..57e81d45
--- /dev/null
+++ b/drivers/clk/zynqmp/clk-zynqmp.h
@@ -0,0 +1,53 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  Copyright (C) 2016-2018 Xilinx
+ */
+
+#ifndef __LINUX_CLK_ZYNQMP_H_
+#define __LINUX_CLK_ZYNQMP_H_
+
+#include <linux/spinlock.h>
+
+#include <linux/firmware/xlnx-zynqmp.h>
+
+/* Clock APIs payload parameters */
+#define CLK_GET_NAME_RESP_LEN				16
+#define CLK_GET_TOPOLOGY_RESP_WORDS			3
+#define CLK_GET_PARENTS_RESP_WORDS			3
+#define CLK_GET_ATTR_RESP_WORDS				1
+
+enum topology_type {
+	TYPE_INVALID,
+	TYPE_MUX,
+	TYPE_PLL,
+	TYPE_FIXEDFACTOR,
+	TYPE_DIV1,
+	TYPE_DIV2,
+	TYPE_GATE,
+};
+
+struct clk_hw *zynqmp_clk_register_pll(struct device *dev, const char *name,
+				       u32 clk_id,
+				       const char *parent,
+				       unsigned long flag);
+
+struct clk_hw *zynqmp_clk_register_gate(struct device *dev, const char *name,
+					u32 clk_id,
+					const char *parent,
+					unsigned long flags,
+					u8 clk_gate_flags);
+
+struct clk_hw *zynqmp_clk_register_divider(struct device *dev,
+					   const char *name,
+					   u32 clk_id, u32 div_type,
+					   const char *parent,
+					   unsigned long flags,
+					   u8 clk_divider_flags);
+
+struct clk_hw *zynqmp_clk_register_mux(struct device *dev, const char *name,
+				       u32 clk_id,
+				       const char * const *parents,
+				       u8 num_parents,
+				       unsigned long flags,
+				       u8 clk_mux_flags);
+#endif
diff --git a/drivers/clk/zynqmp/clkc.c b/drivers/clk/zynqmp/clkc.c
new file mode 100644
index 0000000..a315fc2
--- /dev/null
+++ b/drivers/clk/zynqmp/clkc.c
@@ -0,0 +1,737 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Zynq UltraScale+ MPSoC clock controller
+ *
+ *  Copyright (C) 2016-2018 Xilinx
+ *
+ * Based on drivers/clk/zynq/clkc.c
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include "clk-zynqmp.h"
+
+#define MAX_PARENT			100
+#define MAX_NODES			6
+#define MAX_NAME_LEN			50
+#define MAX_CLOCK			300
+
+#define CLK_INIT_ENABLE_SHIFT		1
+#define CLK_TYPE_SHIFT			2
+
+#define PM_API_PAYLOAD_LEN		3
+
+#define NA_PARENT			0xFFFFFFFF
+#define DUMMY_PARENT			0xFFFFFFFE
+
+#define CLK_TYPE_FIELD_LEN		4
+#define CLK_TOPOLOGY_NODE_OFFSET	16
+#define NODES_PER_RESP			3
+
+#define CLK_TYPE_FIELD_MASK		0xF
+#define CLK_FLAG_FIELD_MASK		GENMASK(21, 8)
+#define CLK_TYPE_FLAG_FIELD_MASK	GENMASK(31, 24)
+
+#define CLK_PARENTS_ID_LEN		16
+#define CLK_PARENTS_ID_MASK		0xFFFF
+
+/* Flags for parents */
+#define PARENT_CLK_SELF			0
+#define PARENT_CLK_NODE1		1
+#define PARENT_CLK_NODE2		2
+#define PARENT_CLK_NODE3		3
+#define PARENT_CLK_NODE4		4
+#define PARENT_CLK_EXTERNAL		5
+
+#define END_OF_CLK_NAME			"END_OF_CLK"
+#define RESERVED_CLK_NAME		""
+
+#define CLK_VALID_MASK			0x1
+#define CLK_INIT_ENABLE_MASK		(0x1 << CLK_INIT_ENABLE_SHIFT)
+
+enum clk_type {
+	CLK_TYPE_OUTPUT,
+	CLK_TYPE_EXTERNAL,
+};
+
+/**
+ * struct clock_parent - Structure for parent of clock
+ * @name:	Parent name
+ * @id:		Parent clock ID
+ * @flag:	Parent flags
+ */
+struct clock_parent {
+	char name[MAX_NAME_LEN];
+	int id;
+	u32 flag;
+};
+
+/**
+ * struct clock_topology - Structure for topology of clock
+ * @type:	Type of topology
+ * @flag:	Topology flags
+ * @type_flag:	Topology type specific flag
+ */
+struct clock_topology {
+	u32 type;
+	u32 flag;
+	u32 type_flag;
+};
+
+/**
+ * struct zynqmp_clock - Structure for clock
+ * @clk_name:		Clock name
+ * @valid:		Validity flag of clock
+ * @init_enable:	init_enable flag of clock
+ * @type:		Clock type (Output/External)
+ * @node:		Clock tolology nodes
+ * @num_nodes:		Number of nodes present in topology
+ * @parent:		structure of parent of clock
+ * @num_parents:	Number of parents of clock
+ */
+struct zynqmp_clock {
+	char clk_name[MAX_NAME_LEN];
+	u32 valid;
+	u32 init_enable;
+	enum clk_type type;
+	struct clock_topology node[MAX_NODES];
+	u32 num_nodes;
+	struct clock_parent parent[MAX_PARENT];
+	u32 num_parents;
+};
+
+static const char clk_type_postfix[][10] = {
+	[TYPE_INVALID] = "",
+	[TYPE_MUX] = "_mux",
+	[TYPE_GATE] = "",
+	[TYPE_DIV1] = "_div1",
+	[TYPE_DIV2] = "_div2",
+	[TYPE_FIXEDFACTOR] = "_ff",
+	[TYPE_PLL] = ""
+};
+
+static struct zynqmp_clock clock[MAX_CLOCK];
+static struct clk_hw_onecell_data *zynqmp_data;
+static unsigned int clock_max_idx;
+static const struct zynqmp_eemi_ops *eemi_ops;
+
+/**
+ * zynqmp_is_valid_clock() - Check whether clock is valid or not
+ * @clk_id:	Clock index
+ * @valid:	1: if clock is valid
+ *		0: invalid clock
+ *
+ * Return: 0 on success else error code
+ */
+static int zynqmp_is_valid_clock(u32 clk_id, u32 *valid)
+{
+	if (clk_id > clock_max_idx)
+		return -ENODEV;
+
+	*valid = clock[clk_id].valid;
+
+	return *valid ? 0 : -EINVAL;
+}
+
+/**
+ * zynqmp_get_clock_name() - Get name of clock from Clock index
+ * @clk_id:	Clock index
+ * @clk_name:	Name of clock
+ *
+ * Return: 0 on success else error code
+ */
+static int zynqmp_get_clock_name(u32 clk_id, char *clk_name)
+{
+	int ret;
+	u32 valid;
+
+	ret = zynqmp_is_valid_clock(clk_id, &valid);
+	if (!ret && valid) {
+		strncpy(clk_name, clock[clk_id].clk_name, MAX_NAME_LEN);
+		return ret;
+	} else {
+		return ret;
+	}
+}
+
+/**
+ * zynqmp_get_clock_type() - Get type of clock
+ * @clk_id:	Clock index
+ * @type:	Clock type: CLK_TYPE_OUTPUT or CLK_TYPE_EXTERNAL
+ *
+ * Return: 0 on success else error code
+ */
+static int zynqmp_get_clock_type(u32 clk_id, u32 *type)
+{
+	int ret;
+	u32 valid;
+
+	ret = zynqmp_is_valid_clock(clk_id, &valid);
+	if (!ret && valid) {
+		*type = clock[clk_id].type;
+		return ret;
+	} else {
+		return ret;
+	}
+}
+
+/**
+ * zynqmp_pm_clock_get_name() - Get the name of clock for given id
+ * @clock_id:	ID of the clock to be queried
+ * @name:	Name of given clock
+ *
+ * This function is used to get name of clock specified by given
+ * clock ID.
+ *
+ * Return: Returns 0, in case of error name would be 0
+ */
+static int zynqmp_pm_clock_get_name(u32 clock_id, char *name)
+{
+	struct zynqmp_pm_query_data qdata = {0};
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+
+	qdata.qid = PM_QID_CLOCK_GET_NAME;
+	qdata.arg1 = clock_id;
+
+	eemi_ops->query_data(qdata, ret_payload);
+	memcpy(name, ret_payload, CLK_GET_NAME_RESP_LEN);
+
+	return 0;
+}
+
+/**
+ * zynqmp_pm_clock_get_topology() - Get the topology of clock for given id
+ * @clock_id:	ID of the clock to be queried
+ * @index:	Node index of clock topology
+ * @topology:	Buffer to store nodes in topology and flags
+ *
+ * This function is used to get topology information for the clock
+ * specified by given clock ID.
+ *
+ * This API will return 3 node of topology with a single response. To get
+ * other nodes, master should call same API in loop with new
+ * index till error is returned. E.g First call should have
+ * index 0 which will return nodes 0,1 and 2. Next call, index
+ * should be 3 which will return nodes 3,4 and 5 and so on.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_clock_get_topology(u32 clock_id, u32 index, u32 *topology)
+{
+	struct zynqmp_pm_query_data qdata = {0};
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+
+	qdata.qid = PM_QID_CLOCK_GET_TOPOLOGY;
+	qdata.arg1 = clock_id;
+	qdata.arg2 = index;
+
+	ret = eemi_ops->query_data(qdata, ret_payload);
+	memcpy(topology, &ret_payload[1], CLK_GET_TOPOLOGY_RESP_WORDS * 4);
+
+	return ret;
+}
+
+/**
+ * zynqmp_pm_clock_get_fixedfactor_params() - Get clock's fixed factor params
+ * @clock_id:	Clock ID
+ * @mul:	Multiplication value
+ * @div:	Divisor value
+ *
+ * This function is used to get fixed factor parameters for the fixed
+ * clock. This API is applicable only for the fixed clock.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_clock_get_fixedfactor_params(u32 clock_id,
+						  u32 *mul,
+						  u32 *div)
+{
+	struct zynqmp_pm_query_data qdata = {0};
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+
+	qdata.qid = PM_QID_CLOCK_GET_FIXEDFACTOR_PARAMS;
+	qdata.arg1 = clock_id;
+
+	ret = eemi_ops->query_data(qdata, ret_payload);
+	*mul = ret_payload[1];
+	*div = ret_payload[2];
+
+	return ret;
+}
+
+/**
+ * zynqmp_pm_clock_get_parents() - Get the first 3 parents of clock for given id
+ * @clock_id:	Clock ID
+ * @index:	Parent index
+ * @parents:	3 parents of the given clock
+ *
+ * This function is used to get 3 parents for the clock specified by
+ * given clock ID.
+ *
+ * This API will return 3 parents with a single response. To get
+ * other parents, master should call same API in loop with new
+ * parent index till error is returned. E.g First call should have
+ * index 0 which will return parents 0,1 and 2. Next call, index
+ * should be 3 which will return parent 3,4 and 5 and so on.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_clock_get_parents(u32 clock_id, u32 index, u32 *parents)
+{
+	struct zynqmp_pm_query_data qdata = {0};
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+
+	qdata.qid = PM_QID_CLOCK_GET_PARENTS;
+	qdata.arg1 = clock_id;
+	qdata.arg2 = index;
+
+	ret = eemi_ops->query_data(qdata, ret_payload);
+	memcpy(parents, &ret_payload[1], CLK_GET_PARENTS_RESP_WORDS * 4);
+
+	return ret;
+}
+
+/**
+ * zynqmp_pm_clock_get_attributes() - Get the attributes of clock for given id
+ * @clock_id:	Clock ID
+ * @attr:	Clock attributes
+ *
+ * This function is used to get clock's attributes(e.g. valid, clock type, etc).
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_clock_get_attributes(u32 clock_id, u32 *attr)
+{
+	struct zynqmp_pm_query_data qdata = {0};
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+
+	qdata.qid = PM_QID_CLOCK_GET_ATTRIBUTES;
+	qdata.arg1 = clock_id;
+
+	ret = eemi_ops->query_data(qdata, ret_payload);
+	memcpy(attr, &ret_payload[1], CLK_GET_ATTR_RESP_WORDS * 4);
+
+	return ret;
+}
+
+/**
+ * zynqmp_clock_get_topology() - Get topology of clock from firmware using
+ *				 PM_API
+ * @clk_id:		Clock index
+ * @clk_topology:	Structure of clock topology
+ * @num_nodes:		number of nodes
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_clock_get_topology(u32 clk_id,
+				     struct clock_topology *clk_topology,
+				     u32 *num_nodes)
+{
+	int j, k = 0, ret;
+	u32 pm_resp[PM_API_PAYLOAD_LEN] = {0};
+
+	*num_nodes = 0;
+	for (j = 0; j <= MAX_NODES; j += 3) {
+		ret = zynqmp_pm_clock_get_topology(clk_id, j, pm_resp);
+		if (ret)
+			return ret;
+		for (k = 0; k < PM_API_PAYLOAD_LEN; k++) {
+			if (!(pm_resp[k] & CLK_TYPE_FIELD_MASK))
+				return 0;
+			clk_topology[*num_nodes].type = pm_resp[k] &
+							CLK_TYPE_FIELD_MASK;
+			clk_topology[*num_nodes].flag =
+					FIELD_GET(CLK_FLAG_FIELD_MASK,
+						  pm_resp[k]);
+			clk_topology[*num_nodes].type_flag =
+				FIELD_GET(CLK_TYPE_FLAG_FIELD_MASK,
+					  pm_resp[k]);
+			(*num_nodes)++;
+		}
+	}
+	return 0;
+}
+
+/**
+ * zynqmp_clock_get_parents() - Get parents info from firmware using PM_API
+ * @clk_id:		Clock index
+ * @parents:		Structure of parent information
+ * @num_parents:	Total number of parents
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_clock_get_parents(u32 clk_id, struct clock_parent *parents,
+				    u32 *num_parents)
+{
+	int j = 0, k, ret, total_parents = 0;
+	u32 pm_resp[PM_API_PAYLOAD_LEN] = {0};
+	struct clock_parent *parent;
+
+	do {
+		/* Get parents from firmware */
+		ret = zynqmp_pm_clock_get_parents(clk_id, j, pm_resp);
+		if (ret)
+			return ret;
+
+		for (k = 0; k < PM_API_PAYLOAD_LEN; k++) {
+			if (pm_resp[k] == NA_PARENT) {
+				*num_parents = total_parents;
+				return 0;
+			}
+
+			parent = &parents[k + j];
+			parent->id = pm_resp[k] & CLK_PARENTS_ID_MASK;
+			if (pm_resp[k] == DUMMY_PARENT) {
+				strcpy(parent->name, "dummy_name");
+				parent->flag = 0;
+			} else {
+				parent->flag = pm_resp[k] >>
+							CLK_PARENTS_ID_LEN;
+				if (zynqmp_get_clock_name(parent->id,
+							  parent->name))
+					continue;
+			}
+			total_parents++;
+		}
+		j += PM_API_PAYLOAD_LEN;
+	} while (total_parents <= MAX_PARENT);
+	return 0;
+}
+
+/**
+ * zynqmp_get_parent_list() - Create list of parents name
+ * @np:			Device node
+ * @clk_id:		Clock index
+ * @parent_list:	List of parent's name
+ * @num_parents:	Total number of parents
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_get_parent_list(struct device_node *np, u32 clk_id,
+				  const char **parent_list, u32 *num_parents)
+{
+	int i = 0, ret;
+	u32 total_parents = clock[clk_id].num_parents;
+	struct clock_topology *clk_nodes;
+	struct clock_parent *parents;
+
+	clk_nodes = clock[clk_id].node;
+	parents = clock[clk_id].parent;
+
+	for (i = 0; i < total_parents; i++) {
+		if (!parents[i].flag) {
+			parent_list[i] = parents[i].name;
+		} else if (parents[i].flag == PARENT_CLK_EXTERNAL) {
+			ret = of_property_match_string(np, "clock-names",
+						       parents[i].name);
+			if (ret < 0)
+				strcpy(parents[i].name, "dummy_name");
+			parent_list[i] = parents[i].name;
+		} else {
+			strcat(parents[i].name,
+			       clk_type_postfix[clk_nodes[parents[i].flag - 1].
+			       type]);
+			parent_list[i] = parents[i].name;
+		}
+	}
+
+	*num_parents = total_parents;
+	return 0;
+}
+
+/**
+ * zynqmp_register_clk_topology() - Register clock topology
+ * @clk_id:		Clock index
+ * @clk_name:		Clock Name
+ * @num_parents:	Total number of parents
+ * @parent_names:	List of parents name
+ *
+ * Return: Returns either clock hardware or error+reason
+ */
+static struct clk_hw *zynqmp_register_clk_topology(int clk_id, char *clk_name,
+						   int num_parents,
+						   const char **parent_names)
+{
+	int j, ret;
+	u32 num_nodes, mult, div;
+	char *clk_out = NULL;
+	struct clock_topology *nodes;
+	struct clk_hw *hw = NULL;
+
+	nodes = clock[clk_id].node;
+	num_nodes = clock[clk_id].num_nodes;
+
+	for (j = 0; j < num_nodes; j++) {
+		/*
+		 * Clock name received from firmware is output clock name.
+		 * Intermediate clock names are postfixed with type of clock.
+		 */
+		if (j != (num_nodes - 1)) {
+			clk_out = kasprintf(GFP_KERNEL, "%s%s", clk_name,
+					    clk_type_postfix[nodes[j].type]);
+		} else {
+			clk_out = kasprintf(GFP_KERNEL, "%s", clk_name);
+		}
+
+		switch (nodes[j].type) {
+		case TYPE_MUX:
+			hw = zynqmp_clk_register_mux(NULL, clk_out,
+						     clk_id, parent_names,
+						     num_parents,
+						     nodes[j].flag,
+						     nodes[j].type_flag);
+			break;
+		case TYPE_PLL:
+			hw = zynqmp_clk_register_pll(NULL, clk_out, clk_id,
+						     parent_names[0],
+						     nodes[j].flag);
+			break;
+		case TYPE_FIXEDFACTOR:
+			ret = zynqmp_pm_clock_get_fixedfactor_params(clk_id,
+								     &mult,
+								     &div);
+			hw = clk_hw_register_fixed_factor(NULL, clk_out,
+							  parent_names[0],
+							  nodes[j].flag, mult,
+							  div);
+			break;
+		case TYPE_DIV1:
+		case TYPE_DIV2:
+			hw = zynqmp_clk_register_divider(NULL, clk_out, clk_id,
+							 nodes[j].type,
+							 parent_names[0],
+							 nodes[j].flag,
+							 nodes[j].type_flag);
+			break;
+		case TYPE_GATE:
+
+			hw = zynqmp_clk_register_gate(NULL, clk_out, clk_id,
+						      parent_names[0],
+						      nodes[j].flag,
+						      nodes[j].type_flag);
+			break;
+		default:
+			pr_err("%s() Unknown topology for %s\n",
+			       __func__, clk_out);
+			break;
+		}
+		if (IS_ERR(hw))
+			pr_warn_once("%s() %s register fail with %ld\n",
+				     __func__, clk_name, PTR_ERR(hw));
+
+		parent_names[0] = clk_out;
+	}
+	kfree(clk_out);
+	return hw;
+}
+
+/**
+ * zynqmp_register_clocks() - Register clocks
+ * @np:		Device node
+ *
+ * Return: 0 on success else error code
+ */
+static int zynqmp_register_clocks(struct device_node *np)
+{
+	int ret;
+	u32 i, total_parents = 0, type = 0;
+	const char *parent_names[MAX_PARENT];
+
+	for (i = 0; i < clock_max_idx; i++) {
+		char clk_name[MAX_NAME_LEN];
+
+		/* get clock name, continue to next clock if name not found */
+		if (zynqmp_get_clock_name(i, clk_name))
+			continue;
+
+		/* Check if clock is valid and output clock.
+		 * Do not regiter invalid or external clock.
+		 */
+		ret = zynqmp_get_clock_type(i, &type);
+		if (ret || type != CLK_TYPE_OUTPUT)
+			continue;
+
+		/* Get parents of clock*/
+		if (zynqmp_get_parent_list(np, i, parent_names,
+					   &total_parents)) {
+			WARN_ONCE(1, "No parents found for %s\n",
+				  clock[i].clk_name);
+			continue;
+		}
+
+		zynqmp_data->hws[i] =
+			zynqmp_register_clk_topology(i, clk_name,
+						     total_parents,
+						     parent_names);
+	}
+
+	for (i = 0; i < clock_max_idx; i++) {
+		if (IS_ERR(zynqmp_data->hws[i])) {
+			pr_err("Zynq Ultrascale+ MPSoC clk %s: register failed with %ld\n",
+			       clock[i].clk_name, PTR_ERR(zynqmp_data->hws[i]));
+			WARN_ON(1);
+		}
+	}
+	return 0;
+}
+
+/**
+ * zynqmp_get_clock_info() - Get clock information from firmware using PM_API
+ */
+static void zynqmp_get_clock_info(void)
+{
+	int i, ret;
+	u32 attr, type = 0;
+
+	memset(clock, 0, sizeof(clock));
+	for (i = 0; i < MAX_CLOCK; i++) {
+		zynqmp_pm_clock_get_name(i, clock[i].clk_name);
+		if (!strcmp(clock[i].clk_name, END_OF_CLK_NAME)) {
+			clock_max_idx = i;
+			break;
+		} else if (!strcmp(clock[i].clk_name, RESERVED_CLK_NAME)) {
+			continue;
+		}
+
+		ret = zynqmp_pm_clock_get_attributes(i, &attr);
+		if (ret)
+			continue;
+
+		clock[i].valid = attr & CLK_VALID_MASK;
+		clock[i].init_enable = !!(attr & CLK_INIT_ENABLE_MASK);
+		clock[i].type = attr >> CLK_TYPE_SHIFT ? CLK_TYPE_EXTERNAL :
+							CLK_TYPE_OUTPUT;
+	}
+
+	/* Get topology of all clock */
+	for (i = 0; i < clock_max_idx; i++) {
+		ret = zynqmp_get_clock_type(i, &type);
+		if (ret || type != CLK_TYPE_OUTPUT)
+			continue;
+
+		ret = zynqmp_clock_get_topology(i, clock[i].node,
+						&clock[i].num_nodes);
+		if (ret)
+			continue;
+
+		ret = zynqmp_clock_get_parents(i, clock[i].parent,
+					       &clock[i].num_parents);
+		if (ret)
+			continue;
+	}
+}
+
+/**
+ * zynqmp_validate_eemi_ops() - Validate eemi ops
+ *
+ * Return: 0 on success else error code
+ */
+static inline int zynqmp_validate_eemi_ops(void)
+{
+	eemi_ops = zynqmp_pm_get_eemi_ops();
+	if (!eemi_ops || !eemi_ops->query_data ||
+	    !eemi_ops->clock_setdivider ||
+	    !eemi_ops->clock_getdivider ||
+	    !eemi_ops->clock_setparent ||
+	    !eemi_ops->clock_getparent ||
+	    !eemi_ops->clock_getstate ||
+	    !eemi_ops->clock_disable ||
+	    !eemi_ops->clock_enable ||
+	    !eemi_ops->ioctl)
+		return -ENXIO;
+
+	return 0;
+}
+
+/**
+ * zynqmp_clk_setup() - Setup the clock framework and register clocks
+ * @np:		Device node
+ *
+ * Return: 0 on success else error code
+ */
+static int __init zynqmp_clk_setup(struct device_node *np)
+{
+	int idx;
+
+	idx = of_property_match_string(np, "clock-names", "pss_ref_clk");
+	if (idx < 0) {
+		pr_err("pss_ref_clk not provided\n");
+		return -ENOENT;
+	}
+	idx = of_property_match_string(np, "clock-names", "video_clk");
+	if (idx < 0) {
+		pr_err("video_clk not provided\n");
+		return -ENOENT;
+	}
+	idx = of_property_match_string(np, "clock-names", "pss_alt_ref_clk");
+	if (idx < 0) {
+		pr_err("pss_alt_ref_clk not provided\n");
+		return -ENOENT;
+	}
+	idx = of_property_match_string(np, "clock-names", "aux_ref_clk");
+	if (idx < 0) {
+		pr_err("aux_ref_clk not provided\n");
+		return -ENOENT;
+	}
+	idx = of_property_match_string(np, "clock-names", "gt_crx_ref_clk");
+	if (idx < 0) {
+		pr_err("aux_ref_clk not provided\n");
+		return -ENOENT;
+	}
+
+	zynqmp_data = kzalloc(sizeof(*zynqmp_data) + sizeof(*zynqmp_data) *
+						MAX_CLOCK, GFP_KERNEL);
+	if (!zynqmp_data)
+		return -ENOMEM;
+
+	zynqmp_get_clock_info();
+	zynqmp_register_clocks(np);
+
+	zynqmp_data->num = clock_max_idx;
+	of_clk_add_hw_provider(np, of_clk_hw_onecell_get, zynqmp_data);
+
+	return 0;
+}
+
+/**
+ * zynqmp_clock_init() - Initialize zynqmp clocks
+ *
+ * Return: 0 on success else error code
+ */
+static int __init zynqmp_clock_init(void)
+{
+	int ret;
+	struct device_node *np;
+
+	np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp");
+	if (!np)
+		return -ENOENT;
+	of_node_put(np);
+
+	np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp-clk");
+	if (!np) {
+		pr_err("%s: clk node not found\n", __func__);
+		return -ENOENT;
+	}
+
+	ret = zynqmp_validate_eemi_ops();
+	if (ret) {
+		pr_err("%s: eemi ops validation fail\n", __func__);
+		of_node_put(np);
+		return ret;
+	}
+
+	ret = zynqmp_clk_setup(np);
+	of_node_put(np);
+
+	return ret;
+}
+arch_initcall(zynqmp_clock_init);
diff --git a/drivers/clk/zynqmp/divider.c b/drivers/clk/zynqmp/divider.c
new file mode 100644
index 0000000..ef3e2e9
--- /dev/null
+++ b/drivers/clk/zynqmp/divider.c
@@ -0,0 +1,219 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Zynq UltraScale+ MPSoC Divider support
+ *
+ *  Copyright (C) 2016-2018 Xilinx
+ *
+ * Adjustable divider clock implementation
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include "clk-zynqmp.h"
+
+/*
+ * DOC: basic adjustable divider clock that cannot gate
+ *
+ * Traits of this clock:
+ * prepare - clk_prepare only ensures that parents are prepared
+ * enable - clk_enable only ensures that parents are enabled
+ * rate - rate is adjustable.  clk->rate = ceiling(parent->rate / divisor)
+ * parent - fixed parent.  No clk_set_parent support
+ */
+
+#define to_zynqmp_clk_divider(_hw)		\
+	container_of(_hw, struct zynqmp_clk_divider, hw)
+
+#define CLK_FRAC	BIT(13) /* has a fractional parent */
+
+/**
+ * struct zynqmp_clk_divider - adjustable divider clock
+ * @hw:		handle between common and hardware-specific interfaces
+ * @flags:	Hardware specific flags
+ * @clk_id:	Id of clock
+ * @div_type:	divisor type (TYPE_DIV1 or TYPE_DIV2)
+ */
+struct zynqmp_clk_divider {
+	struct clk_hw hw;
+	u8 flags;
+	u32 clk_id;
+	u32 div_type;
+};
+
+static int zynqmp_divider_get_val(unsigned long parent_rate, unsigned long rate)
+{
+	return DIV_ROUND_CLOSEST(parent_rate, rate);
+}
+
+/**
+ * zynqmp_clk_divider_recalc_rate() - Recalc rate of divider clock
+ * @hw:			handle between common and hardware-specific interfaces
+ * @parent_rate:	rate of parent clock
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static unsigned long zynqmp_clk_divider_recalc_rate(struct clk_hw *hw,
+						    unsigned long parent_rate)
+{
+	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = divider->clk_id;
+	u32 div_type = divider->div_type;
+	u32 div, value;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->clock_getdivider(clk_id, &div);
+
+	if (ret)
+		pr_warn_once("%s() get divider failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	if (div_type == TYPE_DIV1)
+		value = div & 0xFFFF;
+	else
+		value = (div >> 16) & 0xFFFF;
+
+	return DIV_ROUND_UP_ULL(parent_rate, value);
+}
+
+/**
+ * zynqmp_clk_divider_round_rate() - Round rate of divider clock
+ * @hw:			handle between common and hardware-specific interfaces
+ * @rate:		rate of clock to be set
+ * @prate:		rate of parent clock
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static long zynqmp_clk_divider_round_rate(struct clk_hw *hw,
+					  unsigned long rate,
+					  unsigned long *prate)
+{
+	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = divider->clk_id;
+	u32 div_type = divider->div_type;
+	u32 bestdiv;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	/* if read only, just return current value */
+	if (divider->flags & CLK_DIVIDER_READ_ONLY) {
+		ret = eemi_ops->clock_getdivider(clk_id, &bestdiv);
+
+		if (ret)
+			pr_warn_once("%s() get divider failed for %s, ret = %d\n",
+				     __func__, clk_name, ret);
+		if (div_type == TYPE_DIV1)
+			bestdiv = bestdiv & 0xFFFF;
+		else
+			bestdiv  = (bestdiv >> 16) & 0xFFFF;
+
+		return DIV_ROUND_UP_ULL((u64)*prate, bestdiv);
+	}
+
+	bestdiv = zynqmp_divider_get_val(*prate, rate);
+
+	if ((clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) &&
+	    (clk_hw_get_flags(hw) & CLK_FRAC))
+		bestdiv = rate % *prate ? 1 : bestdiv;
+	*prate = rate * bestdiv;
+
+	return rate;
+}
+
+/**
+ * zynqmp_clk_divider_set_rate() - Set rate of divider clock
+ * @hw:			handle between common and hardware-specific interfaces
+ * @rate:		rate of clock to be set
+ * @parent_rate:	rate of parent clock
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
+				       unsigned long parent_rate)
+{
+	struct zynqmp_clk_divider *divider = to_zynqmp_clk_divider(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = divider->clk_id;
+	u32 div_type = divider->div_type;
+	u32 value, div;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	value = zynqmp_divider_get_val(parent_rate, rate);
+	if (div_type == TYPE_DIV1) {
+		div = value & 0xFFFF;
+		div |= 0xffff << 16;
+	} else {
+		div = 0xffff;
+		div |= value << 16;
+	}
+
+	ret = eemi_ops->clock_setdivider(clk_id, div);
+
+	if (ret)
+		pr_warn_once("%s() set divider failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	return ret;
+}
+
+static const struct clk_ops zynqmp_clk_divider_ops = {
+	.recalc_rate = zynqmp_clk_divider_recalc_rate,
+	.round_rate = zynqmp_clk_divider_round_rate,
+	.set_rate = zynqmp_clk_divider_set_rate,
+};
+
+/**
+ * zynqmp_clk_register_divider() - register a divider clock
+ * @dev:		device registering this clock
+ * @name:		name of this clock
+ * @clk_id:		Id of clock
+ * @div_type:		Type of divisor
+ * @parent:		name of clock's parent
+ * @flags:		framework-specific flags
+ * @clk_divider_flags:	divider-specific flags for this clock
+ *
+ * Return: clock hardware to registered clock divider
+ */
+struct clk_hw *zynqmp_clk_register_divider(struct device *dev,
+					   const char *name,
+					   u32 clk_id, u32 div_type,
+					   const char *parent,
+					   unsigned long flags,
+					   u8 clk_divider_flags)
+{
+	struct zynqmp_clk_divider *div;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	/* allocate the divider */
+	div = kzalloc(sizeof(*div), GFP_KERNEL);
+	if (!div)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &zynqmp_clk_divider_ops;
+	init.flags = flags;
+	init.parent_names = &parent;
+	init.num_parents = 1;
+
+	/* struct clk_divider assignments */
+	div->flags = clk_divider_flags;
+	div->hw.init = &init;
+	div->clk_id = clk_id;
+	div->div_type = div_type;
+
+	hw = &div->hw;
+	ret = clk_hw_register(dev, hw);
+	if (ret) {
+		kfree(div);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+EXPORT_SYMBOL_GPL(zynqmp_clk_register_divider);
diff --git a/drivers/clk/zynqmp/pll.c b/drivers/clk/zynqmp/pll.c
new file mode 100644
index 0000000..1782829
--- /dev/null
+++ b/drivers/clk/zynqmp/pll.c
@@ -0,0 +1,345 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Zynq UltraScale+ MPSoC PLL driver
+ *
+ *  Copyright (C) 2016-2018 Xilinx
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include "clk-zynqmp.h"
+
+/**
+ * struct zynqmp_pll - Structure for PLL clock
+ * @hw:		Handle between common and hardware-specific interfaces
+ * @clk_id:	PLL clock ID
+ */
+struct zynqmp_pll {
+	struct clk_hw hw;
+	u32 clk_id;
+};
+
+#define to_zynqmp_pll(_hw)	container_of(_hw, struct zynqmp_pll, hw)
+
+#define PLL_FBDIV_MIN	25
+#define PLL_FBDIV_MAX	125
+
+#define PS_PLL_VCO_MIN 1500000000
+#define PS_PLL_VCO_MAX 3000000000UL
+
+enum pll_mode {
+	PLL_MODE_INT,
+	PLL_MODE_FRAC,
+};
+
+#define FRAC_OFFSET 0x8
+#define PLLFCFG_FRAC_EN	BIT(31)
+#define FRAC_DIV  BIT(16)  /* 2^16 */
+
+/**
+ * zynqmp_pll_get_mode() - Get mode of PLL
+ * @hw:		Handle between common and hardware-specific interfaces
+ *
+ * Return: Mode of PLL
+ */
+static inline enum pll_mode zynqmp_pll_get_mode(struct clk_hw *hw)
+{
+	struct zynqmp_pll *clk = to_zynqmp_pll(hw);
+	u32 clk_id = clk->clk_id;
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->ioctl(0, IOCTL_GET_PLL_FRAC_MODE, clk_id, 0,
+			      ret_payload);
+	if (ret)
+		pr_warn_once("%s() PLL get frac mode failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	return ret_payload[1];
+}
+
+/**
+ * zynqmp_pll_set_mode() - Set the PLL mode
+ * @hw:		Handle between common and hardware-specific interfaces
+ * @on:		Flag to determine the mode
+ */
+static inline void zynqmp_pll_set_mode(struct clk_hw *hw, bool on)
+{
+	struct zynqmp_pll *clk = to_zynqmp_pll(hw);
+	u32 clk_id = clk->clk_id;
+	const char *clk_name = clk_hw_get_name(hw);
+	int ret;
+	u32 mode;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	if (on)
+		mode = PLL_MODE_FRAC;
+	else
+		mode = PLL_MODE_INT;
+
+	ret = eemi_ops->ioctl(0, IOCTL_SET_PLL_FRAC_MODE, clk_id, mode, NULL);
+	if (ret)
+		pr_warn_once("%s() PLL set frac mode failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+}
+
+/**
+ * zynqmp_pll_round_rate() - Round a clock frequency
+ * @hw:		Handle between common and hardware-specific interfaces
+ * @rate:	Desired clock frequency
+ * @prate:	Clock frequency of parent clock
+ *
+ * Return: Frequency closest to @rate the hardware can generate
+ */
+static long zynqmp_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+				  unsigned long *prate)
+{
+	u32 fbdiv;
+	long rate_div, f;
+
+	/* Enable the fractional mode if needed */
+	rate_div = (rate * FRAC_DIV) / *prate;
+	f = rate_div % FRAC_DIV;
+	zynqmp_pll_set_mode(hw, !!f);
+
+	if (zynqmp_pll_get_mode(hw) == PLL_MODE_FRAC) {
+		if (rate > PS_PLL_VCO_MAX) {
+			fbdiv = rate / PS_PLL_VCO_MAX;
+			rate = rate / (fbdiv + 1);
+		}
+		if (rate < PS_PLL_VCO_MIN) {
+			fbdiv = DIV_ROUND_UP(PS_PLL_VCO_MIN, rate);
+			rate = rate * fbdiv;
+		}
+		return rate;
+	}
+
+	fbdiv = DIV_ROUND_CLOSEST(rate, *prate);
+	fbdiv = clamp_t(u32, fbdiv, PLL_FBDIV_MIN, PLL_FBDIV_MAX);
+	return *prate * fbdiv;
+}
+
+/**
+ * zynqmp_pll_recalc_rate() - Recalculate clock frequency
+ * @hw:			Handle between common and hardware-specific interfaces
+ * @parent_rate:	Clock frequency of parent clock
+ *
+ * Return: Current clock frequency
+ */
+static unsigned long zynqmp_pll_recalc_rate(struct clk_hw *hw,
+					    unsigned long parent_rate)
+{
+	struct zynqmp_pll *clk = to_zynqmp_pll(hw);
+	u32 clk_id = clk->clk_id;
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 fbdiv, data;
+	unsigned long rate, frac;
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	/*
+	 * makes probably sense to redundantly save fbdiv in the struct
+	 * zynqmp_pll to save the IO access.
+	 */
+	ret = eemi_ops->clock_getdivider(clk_id, &fbdiv);
+	if (ret)
+		pr_warn_once("%s() get divider failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	rate =  parent_rate * fbdiv;
+	if (zynqmp_pll_get_mode(hw) == PLL_MODE_FRAC) {
+		eemi_ops->ioctl(0, IOCTL_GET_PLL_FRAC_DATA, clk_id, 0,
+				ret_payload);
+		data = ret_payload[1];
+		frac = (parent_rate * data) / FRAC_DIV;
+		rate = rate + frac;
+	}
+
+	return rate;
+}
+
+/**
+ * zynqmp_pll_set_rate() - Set rate of PLL
+ * @hw:			Handle between common and hardware-specific interfaces
+ * @rate:		Frequency of clock to be set
+ * @parent_rate:	Clock frequency of parent clock
+ *
+ * Set PLL divider to set desired rate.
+ *
+ * Returns:            rate which is set on success else error code
+ */
+static int zynqmp_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+			       unsigned long parent_rate)
+{
+	struct zynqmp_pll *clk = to_zynqmp_pll(hw);
+	u32 clk_id = clk->clk_id;
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 fbdiv, data;
+	long rate_div, frac, m, f;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	if (zynqmp_pll_get_mode(hw) == PLL_MODE_FRAC) {
+		rate_div = ((rate * FRAC_DIV) / parent_rate);
+		m = rate_div / FRAC_DIV;
+		f = rate_div % FRAC_DIV;
+		m = clamp_t(u32, m, (PLL_FBDIV_MIN), (PLL_FBDIV_MAX));
+		rate = parent_rate * m;
+		frac = (parent_rate * f) / FRAC_DIV;
+
+		ret = eemi_ops->clock_setdivider(clk_id, m);
+		if (ret)
+			pr_warn_once("%s() set divider failed for %s, ret = %d\n",
+				     __func__, clk_name, ret);
+
+		data = (FRAC_DIV * f) / FRAC_DIV;
+		eemi_ops->ioctl(0, IOCTL_SET_PLL_FRAC_DATA, clk_id, data, NULL);
+
+		return rate + frac;
+	}
+
+	fbdiv = DIV_ROUND_CLOSEST(rate, parent_rate);
+	fbdiv = clamp_t(u32, fbdiv, PLL_FBDIV_MIN, PLL_FBDIV_MAX);
+	ret = eemi_ops->clock_setdivider(clk_id, fbdiv);
+	if (ret)
+		pr_warn_once("%s() set divider failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	return parent_rate * fbdiv;
+}
+
+/**
+ * zynqmp_pll_is_enabled() - Check if a clock is enabled
+ * @hw:		Handle between common and hardware-specific interfaces
+ *
+ * Return: 1 if the clock is enabled, 0 otherwise
+ */
+static int zynqmp_pll_is_enabled(struct clk_hw *hw)
+{
+	struct zynqmp_pll *clk = to_zynqmp_pll(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = clk->clk_id;
+	unsigned int state;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	ret = eemi_ops->clock_getstate(clk_id, &state);
+	if (ret) {
+		pr_warn_once("%s() clock get state failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+		return -EIO;
+	}
+
+	return state ? 1 : 0;
+}
+
+/**
+ * zynqmp_pll_enable() - Enable clock
+ * @hw:		Handle between common and hardware-specific interfaces
+ *
+ * Return: 0 on success else error code
+ */
+static int zynqmp_pll_enable(struct clk_hw *hw)
+{
+	struct zynqmp_pll *clk = to_zynqmp_pll(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = clk->clk_id;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	if (zynqmp_pll_is_enabled(hw))
+		return 0;
+
+	pr_info("PLL: enable\n");
+
+	ret = eemi_ops->clock_enable(clk_id);
+	if (ret)
+		pr_warn_once("%s() clock enable failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+
+	return ret;
+}
+
+/**
+ * zynqmp_pll_disable() - Disable clock
+ * @hw:		Handle between common and hardware-specific interfaces
+ */
+static void zynqmp_pll_disable(struct clk_hw *hw)
+{
+	struct zynqmp_pll *clk = to_zynqmp_pll(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = clk->clk_id;
+	int ret;
+	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+
+	if (!zynqmp_pll_is_enabled(hw))
+		return;
+
+	pr_info("PLL: shutdown\n");
+
+	ret = eemi_ops->clock_disable(clk_id);
+	if (ret)
+		pr_warn_once("%s() clock disable failed for %s, ret = %d\n",
+			     __func__, clk_name, ret);
+}
+
+static const struct clk_ops zynqmp_pll_ops = {
+	.enable = zynqmp_pll_enable,
+	.disable = zynqmp_pll_disable,
+	.is_enabled = zynqmp_pll_is_enabled,
+	.round_rate = zynqmp_pll_round_rate,
+	.recalc_rate = zynqmp_pll_recalc_rate,
+	.set_rate = zynqmp_pll_set_rate,
+};
+
+/**
+ * zynqmp_clk_register_pll() - Register PLL with the clock framework
+ * @dev:	Device pointer
+ * @name:	PLL name
+ * @clk_id:	Clock ID
+ * @parent:	Parent clock name
+ * @flag:	PLL flgas
+ *
+ * Return: clock hardware to the registered clock
+ */
+struct clk_hw *zynqmp_clk_register_pll(struct device *dev, const char *name,
+				       u32 clk_id,
+				       const char *parent,
+				       unsigned long flag)
+{
+	struct zynqmp_pll *pll;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	init.name = name;
+	init.ops = &zynqmp_pll_ops;
+	init.flags = flag;
+	init.parent_names = &parent;
+	init.num_parents = 1;
+
+	pll = kmalloc(sizeof(*pll), GFP_KERNEL);
+	if (!pll)
+		return ERR_PTR(-ENOMEM);
+
+	/* Populate the struct */
+	pll->hw.init = &init;
+	pll->clk_id = clk_id;
+
+	hw = &pll->hw;
+	ret = clk_hw_register(dev, hw);
+	if (ret) {
+		kfree(pll);
+		return ERR_PTR(ret);
+	}
+
+	clk_hw_set_rate_range(hw, PS_PLL_VCO_MIN, PS_PLL_VCO_MAX);
+	if (ret < 0)
+		pr_err("%s:ERROR clk_set_rate_range failed %d\n", name, ret);
+
+	return hw;
+}