@@ -107,4 +107,10 @@ config CLK_RK3588
help
Build the driver for RK3588 Clock Driver.
+config ROCKCHIP_CLK_OUT
+ tristate "Rockchip Clk Out / Input Switch"
+ default y
+ help
+ Say y here to enable clk out / input switch.
+
endif
@@ -29,3 +29,5 @@ obj-$(CONFIG_CLK_RK3368) += clk-rk3368.o
obj-$(CONFIG_CLK_RK3399) += clk-rk3399.o
obj-$(CONFIG_CLK_RK3568) += clk-rk3568.o
obj-$(CONFIG_CLK_RK3588) += clk-rk3588.o rst-rk3588.o
+
+obj-$(CONFIG_ROCKCHIP_CLK_OUT) += clk-out.o
new file mode 100644
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2023 Rockchip Electronics Co., Ltd
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+static DEFINE_SPINLOCK(clk_out_lock);
+
+static int rockchip_clk_out_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = pdev->dev.of_node;
+ struct clk_hw *hw;
+ struct resource *res;
+ const char *clk_name = node->name;
+ const char *parent_name;
+ void __iomem *reg;
+ u32 shift = 0;
+ u8 clk_gate_flags = CLK_GATE_HIWORD_MASK;
+ int ret;
+
+ ret = device_property_read_string(dev, "clock-output-names", &clk_name);
+ if (ret)
+ return ret;
+
+ ret = device_property_read_u32(dev, "rockchip,bit-shift", &shift);
+ if (ret)
+ return ret;
+
+ if (device_property_read_bool(dev, "rockchip,bit-set-to-disable"))
+ clk_gate_flags |= CLK_GATE_SET_TO_DISABLE;
+
+ ret = of_clk_parent_fill(node, &parent_name, 1);
+ if (ret != 1)
+ return -EINVAL;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOMEM;
+
+ reg = devm_ioremap(dev, res->start, resource_size(res));
+ if (!reg)
+ return -ENOMEM;
+
+ pm_runtime_enable(dev);
+
+ hw = clk_hw_register_gate(dev, clk_name, parent_name, CLK_SET_RATE_PARENT,
+ reg, shift, clk_gate_flags, &clk_out_lock);
+ if (IS_ERR(hw)) {
+ ret = -EINVAL;
+ goto err_disable_pm_runtime;
+ }
+
+ of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
+
+ return 0;
+
+err_disable_pm_runtime:
+ pm_runtime_disable(dev);
+
+ return ret;
+}
+
+static int rockchip_clk_out_remove(struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+
+ of_clk_del_provider(node);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static const struct of_device_id rockchip_clk_out_match[] = {
+ { .compatible = "rockchip,clk-out", },
+ {},
+};
+
+static struct platform_driver rockchip_clk_out_driver = {
+ .driver = {
+ .name = "rockchip-clk-out",
+ .of_match_table = rockchip_clk_out_match,
+ },
+ .probe = rockchip_clk_out_probe,
+ .remove = rockchip_clk_out_remove,
+};
+
+module_platform_driver(rockchip_clk_out_driver);
+
+MODULE_DESCRIPTION("Rockchip Clock Input-Output-Switch");
+MODULE_AUTHOR("Sugar Zhang <sugar.zhang@rock-chips.com>");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, rockchip_clk_out_match);
This patch add support switch for clk-bidirection which located at GRF, such as SAIx_MCLK_{IN OUT} which share the same pin. and these config maybe located in many pieces of GRF, which hard to addressed in one single clk driver. so, we add this simple helper driver to address this situation. In order to simplify implement and usage, and also for safety clk usage (avoid high freq glitch), we set all clk out as disabled (which means Input default for clk-bidrection) in the pre-stage, such boot-loader or init by HW default. And then set a safety freq before enable clk-out, such as "assign-clock-rates" or clk_set_rate in drivers. e.g. 1. mclk{out,in}_sai0 define: mclkin_sai0: mclkin-sai0 { compatible = "fixed-clock"; #clock-cells = <0>; clock-frequency = <12288000>; clock-output-names = "mclk_sai0_from_io"; }; mclkout_sai0: mclkout-sai0@ff040070 { compatible = "rockchip,clk-out"; reg = <0 0xff040070 0 0x4>; clocks = <&cru MCLK_SAI0_OUT2IO>; #clock-cells = <0>; clock-output-names = "mclk_sai0_to_io"; rockchip,bit-shift = <4>; //example with PD if reg access needed power-domains = <&power RK3562_PD_VO>; }; Note: clock-output-names of mclkin_sai0 should equal to strings in drivers. such as: drivers/clk/rockchip/clk-rk3562.c: PNAME(clk_sai0_p) = { "clk_sai0_src", "clk_sai0_frac", "xin_osc0_half", "mclk_sai0_from_io" }; 2. mclkout_sai0 usage: &ext_codec { clocks = <&mclkout_sai0>; clock-names = "mclk"; assigned-clocks = <&mclkout_sai0>; assigned-clock-rates = <12288000>; pinctrl-names = "default"; pinctrl-0 = <&i2s0m0_mclk>; }; clk_summary on sai0 work: cat /sys/kernel/debug/clk/clk_summary | egrep "pll|sai0" clk_sai0_src 1 1 0 1188000000 0 0 50000 clk_sai0_frac 1 1 0 12288000 0 0 50000 clk_sai0 1 1 0 12288000 0 0 50000 mclk_sai0 1 1 0 12288000 0 0 50000 mclk_sai0_out2io 1 1 0 12288000 0 0 50000 mclk_sai0_to_io 1 1 0 12288000 0 0 50000 example with PD if reg access needed: * PD status when mclk_sai0_to_io on: cat /sys/kernel/debug/pm_genpd/pm_genpd_summary domain status children /device runtime status ---------------------------------------------------------------------- ... vo on /devices/platform/clocks/ff040070.mclkout-sai0 active ... * PD status when mclk_sai0_to_io off: cat /sys/kernel/debug/pm_genpd/pm_genpd_summary domain status children /device runtime status ---------------------------------------------------------------------- ... vo off-0 /devices/platform/clocks/ff040070.mclkout-sai0 suspended ... 3. mclkin_sai0 usage: please override freq of mclkin as the real external clkin, such as: &mclkin_sai0 { clock-frequency = <24576000>; } &ext_codec { clocks = <&mclkin_sai0>; clock-names = "mclk"; assigned-clocks = <&cru CLK_SAI0>; assigned-clock-parents = <&mclkin_sai0>; pinctrl-names = "default"; pinctrl-0 = <&i2s0m0_mclk>; }; clk_summary on sai0 work: cat /sys/kernel/debug/clk/clk_summary | egrep "pll|sai0" mclk_sai0_from_io 1 1 0 12288000 0 0 50000 clk_sai0 1 1 0 12288000 0 0 50000 mclk_sai0 1 1 0 12288000 0 0 50000 mclk_sai0_out2io 0 0 0 12288000 0 0 50000 mclk_sai0_to_io 0 0 0 12288000 0 0 50000 Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com> --- drivers/clk/rockchip/Kconfig | 6 +++ drivers/clk/rockchip/Makefile | 2 + drivers/clk/rockchip/clk-out.c | 99 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 107 insertions(+) create mode 100644 drivers/clk/rockchip/clk-out.c