diff mbox

[2/3] Phy: Exynos: Add Exynos5250 sata phy driver

Message ID 1380609183-21430-3-git-send-email-yuvaraj.cd@samsung.com
State New, archived
Headers show

Commit Message

Yuvaraj CD Oct. 1, 2013, 6:33 a.m. UTC
This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
phy comprises of CMU and TRSV blocks which are of I2C register Map.
So this patch also adds a i2c client driver, which is used configure
the CMU and TRSV block of exynos5250 SATA PHY.

This patch incorporates the generic phy framework to deal with sata
phy.

This patch depends on the below patch
	[1].drivers: phy: add generic PHY framework
		by Kishon Vijay Abraham I<kishon@ti.com>

Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
Signed-off-by: Girish K S <ks.giri@samsung.com>
Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
---
 drivers/phy/Kconfig                      |    6 +
 drivers/phy/Makefile                     |    1 +
 drivers/phy/exynos/Kconfig               |    5 +
 drivers/phy/exynos/Makefile              |    5 +
 drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
 drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
 drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
 7 files changed, 351 insertions(+)
 create mode 100644 drivers/phy/exynos/Kconfig
 create mode 100644 drivers/phy/exynos/Makefile
 create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
 create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
 create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h

Comments

Sachin Kamat Oct. 1, 2013, 8:15 a.m. UTC | #1
Hi Yuvaraj,

On 1 October 2013 12:03, Yuvaraj Kumar C D <yuvaraj.cd@gmail.com> wrote:

> +static int exynos_sata_i2c_remove(struct i2c_client *client)
> +{
> +       dev_info(&client->adapter->dev,
> +               "detached %s from i2c adapter successfully\n",
> +               client->name);
> +
> +       return 0;
> +}
> +

Since this function does not do anything, this could be removed.

> +static const struct i2c_device_id phy_i2c_device_match[] = {
> +       { "sata-phy-i2c", 0 },
> +};
> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
> +
> +struct i2c_driver sataphy_i2c_driver = {
> +       .probe    = exynos_sata_i2c_probe,
> +       .id_table = phy_i2c_device_match,
> +       .remove         = exynos_sata_i2c_remove,
> +       .driver   = {
> +               .name = "sata-phy-i2c",
> +               .owner = THIS_MODULE,
> +               .of_match_table = (void *)phy_i2c_device_match,

type casting is not required.
Kishon Vijay Abraham I Oct. 1, 2013, 12:51 p.m. UTC | #2
On Tuesday 01 October 2013 12:03 PM, Yuvaraj Kumar C D wrote:
> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
> phy comprises of CMU and TRSV blocks which are of I2C register Map.
> So this patch also adds a i2c client driver, which is used configure
> the CMU and TRSV block of exynos5250 SATA PHY.

Why not make the Exynos5250 sata phy as a i2c client driver instead?
> 
> This patch incorporates the generic phy framework to deal with sata
> phy.
> 
> This patch depends on the below patch
> 	[1].drivers: phy: add generic PHY framework
> 		by Kishon Vijay Abraham I<kishon@ti.com>
> 
> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
> Signed-off-by: Girish K S <ks.giri@samsung.com>
> Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
> ---
>  drivers/phy/Kconfig                      |    6 +
>  drivers/phy/Makefile                     |    1 +
>  drivers/phy/exynos/Kconfig               |    5 +
>  drivers/phy/exynos/Makefile              |    5 +
>  drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
>  drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
>  drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
>  7 files changed, 351 insertions(+)
>  create mode 100644 drivers/phy/exynos/Kconfig
>  create mode 100644 drivers/phy/exynos/Makefile
>  create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 5f85909..ab3d1c6 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -11,3 +11,9 @@ menuconfig GENERIC_PHY
>  	  devices present in the kernel. This layer will have the generic
>  	  API by which phy drivers can create PHY using the phy framework and
>  	  phy users can obtain reference to the PHY.
> +
> +if GENERIC_PHY

NAK. Just select GENERIC_PHY from your driver Kconfig.
> +
> +source "drivers/phy/exynos/Kconfig"
> +
> +endif
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 9e9560f..e0223d7 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -3,3 +3,4 @@
>  #
>  
>  obj-$(CONFIG_GENERIC_PHY)	+= phy-core.o
> +obj-$(CONFIG_PHY_SAMSUNG_SATA)	+= exynos/

simply have phy-exynos5250 in drivers/phy.
> diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
> new file mode 100644
> index 0000000..fa125fb
> --- /dev/null
> +++ b/drivers/phy/exynos/Kconfig
> @@ -0,0 +1,5 @@
> +config PHY_SAMSUNG_SATA
> +	tristate "Samsung Sata SerDes/PHY driver"
> +	help
> +	  Support for Samsung sata SerDes/Phy found on Samsung
> +	  SoCs.
> diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
> new file mode 100644
> index 0000000..50dc7eb
> --- /dev/null
> +++ b/drivers/phy/exynos/Makefile
> @@ -0,0 +1,5 @@
> +#
> +# Makefile for the exynos phy drivers.
> +#
> +ccflags-y := -Idrivers/phy/exynos
> +obj-$(CONFIG_PHY_SAMSUNG_SATA)	+= sata_phy_exynos5250.o exynos5250_phy_i2c.o
> diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
> new file mode 100644
> index 0000000..9c75d3b
> --- /dev/null
> +++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
> @@ -0,0 +1,53 @@
> +/*
> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
> + * Author:
> + *	Yuvaraj C D <yuvaraj.cd@samsung.com>
> + *
> + * This program is free software; you can redistribute  it and/or modify it
> + * under  the terms of  the GNU General  Public License as published by the
> + * Free Software Foundation;  either version 2 of the  License, or (at your
> + * option) any later version.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include "sata_phy_exynos5250.h"
> +
> +static int exynos_sata_i2c_probe(struct i2c_client *client,
> +		const struct i2c_device_id *i2c_id)
> +{
> +	sataphy_attach_i2c_client(client);
> +
> +	dev_info(&client->adapter->dev,
> +		"attached %s into i2c adapter successfully\n",
> +		client->name);
> +
> +	return 0;
> +}
> +
> +static int exynos_sata_i2c_remove(struct i2c_client *client)
> +{
> +	dev_info(&client->adapter->dev,
> +		"detached %s from i2c adapter successfully\n",
> +		client->name);
> +
> +	return 0;
> +}
> +
> +static const struct i2c_device_id phy_i2c_device_match[] = {
> +	{ "sata-phy-i2c", 0 },
> +};
> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
> +
> +struct i2c_driver sataphy_i2c_driver = {
> +	.probe    = exynos_sata_i2c_probe,
> +	.id_table = phy_i2c_device_match,
> +	.remove		= exynos_sata_i2c_remove,
> +	.driver   = {
> +		.name = "sata-phy-i2c",
> +		.owner = THIS_MODULE,
> +		.of_match_table = (void *)phy_i2c_device_match,
> +		},
> +};

As I just mentioned above, we can merge this driver with the below one.
> diff --git a/drivers/phy/exynos/sata_phy_exynos5250.c b/drivers/phy/exynos/sata_phy_exynos5250.c
> new file mode 100644
> index 0000000..726c10e
> --- /dev/null
> +++ b/drivers/phy/exynos/sata_phy_exynos5250.c
> @@ -0,0 +1,248 @@
> +/*
> + * Samsung SATA SerDes(PHY) driver
> + *
> + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
> + * Authors: Girish K S <ks.giri@samsung.com>
> + *         Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/i2c.h>
> +#include <linux/platform_device.h>
> +#include <linux/spinlock.h>
> +#include <linux/clk.h>
> +#include "sata_phy_exynos5250.h"
> +
> +static struct i2c_client *phy_i2c_client;
> +
> +struct exynos_sata_phy {
> +	struct phy *phy;
> +	struct clk *phyclk;
> +	void __iomem *regs;
> +	void __iomem *pmureg;
> +};
> +
> +static bool wait_for_reg_status(void __iomem *base, u32 reg, u32 checkbit,
> +				u32 status)
> +{
> +	unsigned long timeout = jiffies + usecs_to_jiffies(1000);
> +	while (time_before(jiffies, timeout)) {
> +		if ((readl(base + reg) & checkbit) == status)
> +			return true;
> +	}
> +	return false;
> +}
> +
> +void sataphy_attach_i2c_client(struct i2c_client *sata_phy)
> +{
> +	if (sata_phy)
> +		phy_i2c_client = sata_phy;
> +}
> +
> +static int __set_phy_state(struct exynos_sata_phy *state, unsigned int on)
> +{
> +	u32 reg;
> +
> +	reg = readl(state->pmureg);
> +	if (on)
> +		reg |= EXYNOS_SATA_PHY_EN;
> +	else
> +		reg &= ~EXYNOS_SATA_PHY_EN;
> +	writel(reg, state->pmureg);
> +
> +	return 0;
> +}
> +
> +static int exynos_sata_phy_power_on(struct phy *phy)
> +{
> +	struct exynos_sata_phy *state = phy_get_drvdata(phy);
> +
> +	return __set_phy_state(state, 1);
> +}
> +
> +static int exynos_sata_phy_power_off(struct phy *phy)
> +{
> +	struct exynos_sata_phy *state = phy_get_drvdata(phy);
> +
> +	return __set_phy_state(state, 0);
> +}
> +
> +static int exynos_sataphy_parse_dt(struct device *dev,
> +				struct exynos_sata_phy *sata)
> +{
> +	struct device_node *np = dev->of_node;
> +	struct device_node *sataphy_pmu;
> +
> +	sataphy_pmu = of_get_child_by_name(np, "sataphy-pmu");
> +	if (!sataphy_pmu) {
> +		dev_err(dev, "No PMU interface for sata-phy\n");
> +		return -ENODEV;
> +	}
> +
> +	sata->pmureg = of_iomap(sataphy_pmu, 0);
> +	if (!sata->pmureg) {
> +		dev_err(dev, "Can't get sata-phy pmu control register\n");
> +		of_node_put(sataphy_pmu);
> +		return -ENXIO;
> +	}
> +
> +	of_node_put(sataphy_pmu);
> +	return 0;
> +}
> +
> +static int exynos_sata_phy_init(struct phy *phy)
> +{
> +	u32 val;
> +	int ret = 0;
> +	u8 buf[] = { 0x3A, 0x0B };
> +	struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
> +
> +	if (!phy_i2c_client)
> +		return -EPROBE_DEFER;
> +
> +	writel(EXYNOS_SATA_PHY_EN, sata_phy->pmureg);
> +
> +	val = 0;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
> +
> +	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
> +	val |= 0xFF;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
> +
> +	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
> +	val |= LINK_RESET;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
> +
> +	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
> +	val |= RESET_CMN_RST_N;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
> +	val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
> +	val &= ~PHCTRLM_REF_RATE;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
> +
> +	/* High speed enable for Gen3 */
> +	val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
> +	val |= PHCTRLM_HIGH_SPEED;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
> +
> +	val |= CTRL0_P0_PHY_CALIBRATED_SEL | CTRL0_P0_PHY_CALIBRATED;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_CTRL0);
> +
> +	writel(0x2, sata_phy->regs + EXYNOS5_SATA_MODE0);
> +
> +	ret = i2c_master_send(phy_i2c_client, buf, sizeof(buf));
> +	if (ret < 0)
> +		return -ENXIO;
> +
> +	/* release cmu reset */
> +	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
> +	val &= ~RESET_CMN_RST_N;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
> +
> +	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
> +	val |= RESET_CMN_RST_N;
> +	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
> +
> +	return (wait_for_reg_status(sata_phy->regs, EXYNOS5_SATA_PHSATA_STATM,
> +		PHSTATM_PLL_LOCKED, 1)) ? 0 : -EINVAL;
> +
> +}
> +
> +static struct phy_ops exynos_sata_phy_ops = {
> +	.init		= exynos_sata_phy_init,
> +	.power_on	= exynos_sata_phy_power_on,
> +	.power_off	= exynos_sata_phy_power_off,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static int exynos_sata_phy_probe(struct platform_device *pdev)
> +{
> +	struct exynos_sata_phy *sata;
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct phy_provider *phy_provider;
> +	char label[9];
> +	int ret = 0;
> +
> +	sata = devm_kzalloc(dev, sizeof(*sata), GFP_KERNEL);
> +	if (!sata)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> +	sata->regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(sata->regs))
> +		return PTR_ERR(sata->regs);
> +
> +	dev_set_drvdata(dev, sata);
> +
> +	if (i2c_add_driver(&sataphy_i2c_driver)) {
> +		dev_err(dev, "failed to register sataphy i2c driver\n");
> +		return -ENOENT;
> +	}
> +
> +	sata->phyclk = devm_clk_get(dev, "sata_phyctrl");
> +	if (IS_ERR(sata->phyclk)) {
> +		dev_err(dev, "failed to get clk for PHY\n");
> +		return PTR_ERR(sata->phyclk);
> +	}
> +
> +	ret = clk_prepare_enable(sata->phyclk);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to enable source clk\n");
> +		return ret;
> +	}
> +
> +	if (dev->of_node) {
> +		ret = exynos_sataphy_parse_dt(dev, sata);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	phy_provider = devm_of_phy_provider_register(dev,
> +					of_phy_simple_xlate);
> +	if (IS_ERR(phy_provider))
> +		return PTR_ERR(phy_provider);
> +
> +	snprintf(label, sizeof(label), "%s.%d", "sata-phy", pdev->id);
> +
> +	sata->phy = devm_phy_create(dev, pdev->id, &exynos_sata_phy_ops, label);

Alright. You are using a older version of PHY framework. I'll wait for you to
adapt to the latest version of PHY framework [1] before reviewing any further.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux-phy.git next

Thanks
Kishon
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Yuvaraj CD Oct. 7, 2013, 2:05 p.m. UTC | #3
On Tue, Oct 1, 2013 at 6:21 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
> On Tuesday 01 October 2013 12:03 PM, Yuvaraj Kumar C D wrote:
>> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
>> phy comprises of CMU and TRSV blocks which are of I2C register Map.
>> So this patch also adds a i2c client driver, which is used configure
>> the CMU and TRSV block of exynos5250 SATA PHY.
>
> Why not make the Exynos5250 sata phy as a i2c client driver instead?
>>
>> This patch incorporates the generic phy framework to deal with sata
>> phy.
>>
>> This patch depends on the below patch
>>       [1].drivers: phy: add generic PHY framework
>>               by Kishon Vijay Abraham I<kishon@ti.com>
>>
>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
>> Signed-off-by: Girish K S <ks.giri@samsung.com>
>> Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
>> ---
>>  drivers/phy/Kconfig                      |    6 +
>>  drivers/phy/Makefile                     |    1 +
>>  drivers/phy/exynos/Kconfig               |    5 +
>>  drivers/phy/exynos/Makefile              |    5 +
>>  drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
>>  drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
>>  drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
>>  7 files changed, 351 insertions(+)
>>  create mode 100644 drivers/phy/exynos/Kconfig
>>  create mode 100644 drivers/phy/exynos/Makefile
>>  create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h
>>
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index 5f85909..ab3d1c6 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -11,3 +11,9 @@ menuconfig GENERIC_PHY
>>         devices present in the kernel. This layer will have the generic
>>         API by which phy drivers can create PHY using the phy framework and
>>         phy users can obtain reference to the PHY.
>> +
>> +if GENERIC_PHY
>
> NAK. Just select GENERIC_PHY from your driver Kconfig.
>> +
>> +source "drivers/phy/exynos/Kconfig"
>> +
>> +endif
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index 9e9560f..e0223d7 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -3,3 +3,4 @@
>>  #
>>
>>  obj-$(CONFIG_GENERIC_PHY)    += phy-core.o
>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += exynos/
>
> simply have phy-exynos5250 in drivers/phy.
ok.
>> diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
>> new file mode 100644
>> index 0000000..fa125fb
>> --- /dev/null
>> +++ b/drivers/phy/exynos/Kconfig
>> @@ -0,0 +1,5 @@
>> +config PHY_SAMSUNG_SATA
>> +     tristate "Samsung Sata SerDes/PHY driver"
>> +     help
>> +       Support for Samsung sata SerDes/Phy found on Samsung
>> +       SoCs.
>> diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
>> new file mode 100644
>> index 0000000..50dc7eb
>> --- /dev/null
>> +++ b/drivers/phy/exynos/Makefile
>> @@ -0,0 +1,5 @@
>> +#
>> +# Makefile for the exynos phy drivers.
>> +#
>> +ccflags-y := -Idrivers/phy/exynos
>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += sata_phy_exynos5250.o exynos5250_phy_i2c.o
>> diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
>> new file mode 100644
>> index 0000000..9c75d3b
>> --- /dev/null
>> +++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
>> @@ -0,0 +1,53 @@
>> +/*
>> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
>> + * Author:
>> + *   Yuvaraj C D <yuvaraj.cd@samsung.com>
>> + *
>> + * This program is free software; you can redistribute  it and/or modify it
>> + * under  the terms of  the GNU General  Public License as published by the
>> + * Free Software Foundation;  either version 2 of the  License, or (at your
>> + * option) any later version.
>> + *
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/i2c.h>
>> +#include <linux/module.h>
>> +#include "sata_phy_exynos5250.h"
>> +
>> +static int exynos_sata_i2c_probe(struct i2c_client *client,
>> +             const struct i2c_device_id *i2c_id)
>> +{
>> +     sataphy_attach_i2c_client(client);
>> +
>> +     dev_info(&client->adapter->dev,
>> +             "attached %s into i2c adapter successfully\n",
>> +             client->name);
>> +
>> +     return 0;
>> +}
>> +
>> +static int exynos_sata_i2c_remove(struct i2c_client *client)
>> +{
>> +     dev_info(&client->adapter->dev,
>> +             "detached %s from i2c adapter successfully\n",
>> +             client->name);
>> +
>> +     return 0;
>> +}
>> +
>> +static const struct i2c_device_id phy_i2c_device_match[] = {
>> +     { "sata-phy-i2c", 0 },
>> +};
>> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
>> +
>> +struct i2c_driver sataphy_i2c_driver = {
>> +     .probe    = exynos_sata_i2c_probe,
>> +     .id_table = phy_i2c_device_match,
>> +     .remove         = exynos_sata_i2c_remove,
>> +     .driver   = {
>> +             .name = "sata-phy-i2c",
>> +             .owner = THIS_MODULE,
>> +             .of_match_table = (void *)phy_i2c_device_match,
>> +             },
>> +};
>
> As I just mentioned above, we can merge this driver with the below one.
True, Initially it was merged.But already existing drivers of which
are of similar to this kind were done in this way.
Please refer  /drivers/gpu/drm//exynos/exynos_hdmiphy.c

>> diff --git a/drivers/phy/exynos/sata_phy_exynos5250.c b/drivers/phy/exynos/sata_phy_exynos5250.c
>> new file mode 100644
>> index 0000000..726c10e
>> --- /dev/null
>> +++ b/drivers/phy/exynos/sata_phy_exynos5250.c
>> @@ -0,0 +1,248 @@
>> +/*
>> + * Samsung SATA SerDes(PHY) driver
>> + *
>> + * Copyright (C) 2013 Samsung Electronics Co., Ltd.
>> + * Authors: Girish K S <ks.giri@samsung.com>
>> + *         Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#include <linux/delay.h>
>> +#include <linux/io.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/i2c.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/spinlock.h>
>> +#include <linux/clk.h>
>> +#include "sata_phy_exynos5250.h"
>> +
>> +static struct i2c_client *phy_i2c_client;
>> +
>> +struct exynos_sata_phy {
>> +     struct phy *phy;
>> +     struct clk *phyclk;
>> +     void __iomem *regs;
>> +     void __iomem *pmureg;
>> +};
>> +
>> +static bool wait_for_reg_status(void __iomem *base, u32 reg, u32 checkbit,
>> +                             u32 status)
>> +{
>> +     unsigned long timeout = jiffies + usecs_to_jiffies(1000);
>> +     while (time_before(jiffies, timeout)) {
>> +             if ((readl(base + reg) & checkbit) == status)
>> +                     return true;
>> +     }
>> +     return false;
>> +}
>> +
>> +void sataphy_attach_i2c_client(struct i2c_client *sata_phy)
>> +{
>> +     if (sata_phy)
>> +             phy_i2c_client = sata_phy;
>> +}
>> +
>> +static int __set_phy_state(struct exynos_sata_phy *state, unsigned int on)
>> +{
>> +     u32 reg;
>> +
>> +     reg = readl(state->pmureg);
>> +     if (on)
>> +             reg |= EXYNOS_SATA_PHY_EN;
>> +     else
>> +             reg &= ~EXYNOS_SATA_PHY_EN;
>> +     writel(reg, state->pmureg);
>> +
>> +     return 0;
>> +}
>> +
>> +static int exynos_sata_phy_power_on(struct phy *phy)
>> +{
>> +     struct exynos_sata_phy *state = phy_get_drvdata(phy);
>> +
>> +     return __set_phy_state(state, 1);
>> +}
>> +
>> +static int exynos_sata_phy_power_off(struct phy *phy)
>> +{
>> +     struct exynos_sata_phy *state = phy_get_drvdata(phy);
>> +
>> +     return __set_phy_state(state, 0);
>> +}
>> +
>> +static int exynos_sataphy_parse_dt(struct device *dev,
>> +                             struct exynos_sata_phy *sata)
>> +{
>> +     struct device_node *np = dev->of_node;
>> +     struct device_node *sataphy_pmu;
>> +
>> +     sataphy_pmu = of_get_child_by_name(np, "sataphy-pmu");
>> +     if (!sataphy_pmu) {
>> +             dev_err(dev, "No PMU interface for sata-phy\n");
>> +             return -ENODEV;
>> +     }
>> +
>> +     sata->pmureg = of_iomap(sataphy_pmu, 0);
>> +     if (!sata->pmureg) {
>> +             dev_err(dev, "Can't get sata-phy pmu control register\n");
>> +             of_node_put(sataphy_pmu);
>> +             return -ENXIO;
>> +     }
>> +
>> +     of_node_put(sataphy_pmu);
>> +     return 0;
>> +}
>> +
>> +static int exynos_sata_phy_init(struct phy *phy)
>> +{
>> +     u32 val;
>> +     int ret = 0;
>> +     u8 buf[] = { 0x3A, 0x0B };
>> +     struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
>> +
>> +     if (!phy_i2c_client)
>> +             return -EPROBE_DEFER;
>> +
>> +     writel(EXYNOS_SATA_PHY_EN, sata_phy->pmureg);
>> +
>> +     val = 0;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
>> +
>> +     val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
>> +     val |= 0xFF;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
>> +
>> +     val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
>> +     val |= LINK_RESET;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
>> +
>> +     val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
>> +     val |= RESET_CMN_RST_N;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
>> +     val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
>> +     val &= ~PHCTRLM_REF_RATE;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
>> +
>> +     /* High speed enable for Gen3 */
>> +     val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
>> +     val |= PHCTRLM_HIGH_SPEED;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
>> +
>> +     val |= CTRL0_P0_PHY_CALIBRATED_SEL | CTRL0_P0_PHY_CALIBRATED;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_CTRL0);
>> +
>> +     writel(0x2, sata_phy->regs + EXYNOS5_SATA_MODE0);
>> +
>> +     ret = i2c_master_send(phy_i2c_client, buf, sizeof(buf));
>> +     if (ret < 0)
>> +             return -ENXIO;
>> +
>> +     /* release cmu reset */
>> +     val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
>> +     val &= ~RESET_CMN_RST_N;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
>> +
>> +     val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
>> +     val |= RESET_CMN_RST_N;
>> +     writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
>> +
>> +     return (wait_for_reg_status(sata_phy->regs, EXYNOS5_SATA_PHSATA_STATM,
>> +             PHSTATM_PLL_LOCKED, 1)) ? 0 : -EINVAL;
>> +
>> +}
>> +
>> +static struct phy_ops exynos_sata_phy_ops = {
>> +     .init           = exynos_sata_phy_init,
>> +     .power_on       = exynos_sata_phy_power_on,
>> +     .power_off      = exynos_sata_phy_power_off,
>> +     .owner          = THIS_MODULE,
>> +};
>> +
>> +static int exynos_sata_phy_probe(struct platform_device *pdev)
>> +{
>> +     struct exynos_sata_phy *sata;
>> +     struct device *dev = &pdev->dev;
>> +     struct resource *res;
>> +     struct phy_provider *phy_provider;
>> +     char label[9];
>> +     int ret = 0;
>> +
>> +     sata = devm_kzalloc(dev, sizeof(*sata), GFP_KERNEL);
>> +     if (!sata)
>> +             return -ENOMEM;
>> +
>> +     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +
>> +     sata->regs = devm_ioremap_resource(dev, res);
>> +     if (IS_ERR(sata->regs))
>> +             return PTR_ERR(sata->regs);
>> +
>> +     dev_set_drvdata(dev, sata);
>> +
>> +     if (i2c_add_driver(&sataphy_i2c_driver)) {
>> +             dev_err(dev, "failed to register sataphy i2c driver\n");
>> +             return -ENOENT;
>> +     }
>> +
>> +     sata->phyclk = devm_clk_get(dev, "sata_phyctrl");
>> +     if (IS_ERR(sata->phyclk)) {
>> +             dev_err(dev, "failed to get clk for PHY\n");
>> +             return PTR_ERR(sata->phyclk);
>> +     }
>> +
>> +     ret = clk_prepare_enable(sata->phyclk);
>> +     if (ret < 0) {
>> +             dev_err(dev, "failed to enable source clk\n");
>> +             return ret;
>> +     }
>> +
>> +     if (dev->of_node) {
>> +             ret = exynos_sataphy_parse_dt(dev, sata);
>> +             if (ret)
>> +                     return ret;
>> +     }
>> +
>> +     phy_provider = devm_of_phy_provider_register(dev,
>> +                                     of_phy_simple_xlate);
>> +     if (IS_ERR(phy_provider))
>> +             return PTR_ERR(phy_provider);
>> +
>> +     snprintf(label, sizeof(label), "%s.%d", "sata-phy", pdev->id);
>> +
>> +     sata->phy = devm_phy_create(dev, pdev->id, &exynos_sata_phy_ops, label);
>
> Alright. You are using a older version of PHY framework. I'll wait for you to
> adapt to the latest version of PHY framework [1] before reviewing any further.
Sure,I will adapt to the latest version of PHY framework and post soon.
>
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux-phy.git next
>
> Thanks
> Kishon
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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Kishon Vijay Abraham I Nov. 14, 2013, 5:48 a.m. UTC | #4
Hi,

On Monday 07 October 2013 07:35 PM, Yuvaraj Cd wrote:
> On Tue, Oct 1, 2013 at 6:21 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>> On Tuesday 01 October 2013 12:03 PM, Yuvaraj Kumar C D wrote:
>>> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
>>> phy comprises of CMU and TRSV blocks which are of I2C register Map.
>>> So this patch also adds a i2c client driver, which is used configure
>>> the CMU and TRSV block of exynos5250 SATA PHY.
>>
>> Why not make the Exynos5250 sata phy as a i2c client driver instead?
>>>
>>> This patch incorporates the generic phy framework to deal with sata
>>> phy.
>>>
>>> This patch depends on the below patch
>>>       [1].drivers: phy: add generic PHY framework
>>>               by Kishon Vijay Abraham I<kishon@ti.com>
>>>
>>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
>>> Signed-off-by: Girish K S <ks.giri@samsung.com>
>>> Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
>>> ---
>>>  drivers/phy/Kconfig                      |    6 +
>>>  drivers/phy/Makefile                     |    1 +
>>>  drivers/phy/exynos/Kconfig               |    5 +
>>>  drivers/phy/exynos/Makefile              |    5 +
>>>  drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
>>>  drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
>>>  drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
>>>  7 files changed, 351 insertions(+)
>>>  create mode 100644 drivers/phy/exynos/Kconfig
>>>  create mode 100644 drivers/phy/exynos/Makefile
>>>  create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h
>>>
>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>> index 5f85909..ab3d1c6 100644
>>> --- a/drivers/phy/Kconfig
>>> +++ b/drivers/phy/Kconfig
>>> @@ -11,3 +11,9 @@ menuconfig GENERIC_PHY
>>>         devices present in the kernel. This layer will have the generic
>>>         API by which phy drivers can create PHY using the phy framework and
>>>         phy users can obtain reference to the PHY.
>>> +
>>> +if GENERIC_PHY
>>
>> NAK. Just select GENERIC_PHY from your driver Kconfig.
>>> +
>>> +source "drivers/phy/exynos/Kconfig"
>>> +
>>> +endif
>>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>>> index 9e9560f..e0223d7 100644
>>> --- a/drivers/phy/Makefile
>>> +++ b/drivers/phy/Makefile
>>> @@ -3,3 +3,4 @@
>>>  #
>>>
>>>  obj-$(CONFIG_GENERIC_PHY)    += phy-core.o
>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += exynos/
>>
>> simply have phy-exynos5250 in drivers/phy.
> ok.
>>> diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
>>> new file mode 100644
>>> index 0000000..fa125fb
>>> --- /dev/null
>>> +++ b/drivers/phy/exynos/Kconfig
>>> @@ -0,0 +1,5 @@
>>> +config PHY_SAMSUNG_SATA
>>> +     tristate "Samsung Sata SerDes/PHY driver"
>>> +     help
>>> +       Support for Samsung sata SerDes/Phy found on Samsung
>>> +       SoCs.
>>> diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
>>> new file mode 100644
>>> index 0000000..50dc7eb
>>> --- /dev/null
>>> +++ b/drivers/phy/exynos/Makefile
>>> @@ -0,0 +1,5 @@
>>> +#
>>> +# Makefile for the exynos phy drivers.
>>> +#
>>> +ccflags-y := -Idrivers/phy/exynos
>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += sata_phy_exynos5250.o exynos5250_phy_i2c.o
>>> diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>> new file mode 100644
>>> index 0000000..9c75d3b
>>> --- /dev/null
>>> +++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>> @@ -0,0 +1,53 @@
>>> +/*
>>> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
>>> + * Author:
>>> + *   Yuvaraj C D <yuvaraj.cd@samsung.com>
>>> + *
>>> + * This program is free software; you can redistribute  it and/or modify it
>>> + * under  the terms of  the GNU General  Public License as published by the
>>> + * Free Software Foundation;  either version 2 of the  License, or (at your
>>> + * option) any later version.
>>> + *
>>> + */
>>> +
>>> +#include <linux/kernel.h>
>>> +#include <linux/i2c.h>
>>> +#include <linux/module.h>
>>> +#include "sata_phy_exynos5250.h"
>>> +
>>> +static int exynos_sata_i2c_probe(struct i2c_client *client,
>>> +             const struct i2c_device_id *i2c_id)
>>> +{
>>> +     sataphy_attach_i2c_client(client);
>>> +
>>> +     dev_info(&client->adapter->dev,
>>> +             "attached %s into i2c adapter successfully\n",
>>> +             client->name);
>>> +
>>> +     return 0;
>>> +}
>>> +
>>> +static int exynos_sata_i2c_remove(struct i2c_client *client)
>>> +{
>>> +     dev_info(&client->adapter->dev,
>>> +             "detached %s from i2c adapter successfully\n",
>>> +             client->name);
>>> +
>>> +     return 0;
>>> +}
>>> +
>>> +static const struct i2c_device_id phy_i2c_device_match[] = {
>>> +     { "sata-phy-i2c", 0 },
>>> +};
>>> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
>>> +
>>> +struct i2c_driver sataphy_i2c_driver = {
>>> +     .probe    = exynos_sata_i2c_probe,
>>> +     .id_table = phy_i2c_device_match,
>>> +     .remove         = exynos_sata_i2c_remove,
>>> +     .driver   = {
>>> +             .name = "sata-phy-i2c",
>>> +             .owner = THIS_MODULE,
>>> +             .of_match_table = (void *)phy_i2c_device_match,
>>> +             },
>>> +};
>>
>> As I just mentioned above, we can merge this driver with the below one.
> True, Initially it was merged.But already existing drivers of which
> are of similar to this kind were done in this way.
> Please refer  /drivers/gpu/drm//exynos/exynos_hdmiphy.c

Can you point to any discussions where it was decided to go with this approach?

Thanks
Kishon
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Yuvaraj CD Nov. 15, 2013, 5:47 a.m. UTC | #5
On Thu, Nov 14, 2013 at 11:18 AM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
> Hi,
>
> On Monday 07 October 2013 07:35 PM, Yuvaraj Cd wrote:
>> On Tue, Oct 1, 2013 at 6:21 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>>> On Tuesday 01 October 2013 12:03 PM, Yuvaraj Kumar C D wrote:
>>>> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
>>>> phy comprises of CMU and TRSV blocks which are of I2C register Map.
>>>> So this patch also adds a i2c client driver, which is used configure
>>>> the CMU and TRSV block of exynos5250 SATA PHY.
>>>
>>> Why not make the Exynos5250 sata phy as a i2c client driver instead?
>>>>
>>>> This patch incorporates the generic phy framework to deal with sata
>>>> phy.
>>>>
>>>> This patch depends on the below patch
>>>>       [1].drivers: phy: add generic PHY framework
>>>>               by Kishon Vijay Abraham I<kishon@ti.com>
>>>>
>>>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
>>>> Signed-off-by: Girish K S <ks.giri@samsung.com>
>>>> Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
>>>> ---
>>>>  drivers/phy/Kconfig                      |    6 +
>>>>  drivers/phy/Makefile                     |    1 +
>>>>  drivers/phy/exynos/Kconfig               |    5 +
>>>>  drivers/phy/exynos/Makefile              |    5 +
>>>>  drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
>>>>  drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
>>>>  drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
>>>>  7 files changed, 351 insertions(+)
>>>>  create mode 100644 drivers/phy/exynos/Kconfig
>>>>  create mode 100644 drivers/phy/exynos/Makefile
>>>>  create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h
>>>>
>>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>>> index 5f85909..ab3d1c6 100644
>>>> --- a/drivers/phy/Kconfig
>>>> +++ b/drivers/phy/Kconfig
>>>> @@ -11,3 +11,9 @@ menuconfig GENERIC_PHY
>>>>         devices present in the kernel. This layer will have the generic
>>>>         API by which phy drivers can create PHY using the phy framework and
>>>>         phy users can obtain reference to the PHY.
>>>> +
>>>> +if GENERIC_PHY
>>>
>>> NAK. Just select GENERIC_PHY from your driver Kconfig.
>>>> +
>>>> +source "drivers/phy/exynos/Kconfig"
>>>> +
>>>> +endif
>>>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>>>> index 9e9560f..e0223d7 100644
>>>> --- a/drivers/phy/Makefile
>>>> +++ b/drivers/phy/Makefile
>>>> @@ -3,3 +3,4 @@
>>>>  #
>>>>
>>>>  obj-$(CONFIG_GENERIC_PHY)    += phy-core.o
>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += exynos/
>>>
>>> simply have phy-exynos5250 in drivers/phy.
>> ok.
>>>> diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
>>>> new file mode 100644
>>>> index 0000000..fa125fb
>>>> --- /dev/null
>>>> +++ b/drivers/phy/exynos/Kconfig
>>>> @@ -0,0 +1,5 @@
>>>> +config PHY_SAMSUNG_SATA
>>>> +     tristate "Samsung Sata SerDes/PHY driver"
>>>> +     help
>>>> +       Support for Samsung sata SerDes/Phy found on Samsung
>>>> +       SoCs.
>>>> diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
>>>> new file mode 100644
>>>> index 0000000..50dc7eb
>>>> --- /dev/null
>>>> +++ b/drivers/phy/exynos/Makefile
>>>> @@ -0,0 +1,5 @@
>>>> +#
>>>> +# Makefile for the exynos phy drivers.
>>>> +#
>>>> +ccflags-y := -Idrivers/phy/exynos
>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += sata_phy_exynos5250.o exynos5250_phy_i2c.o
>>>> diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>> new file mode 100644
>>>> index 0000000..9c75d3b
>>>> --- /dev/null
>>>> +++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>> @@ -0,0 +1,53 @@
>>>> +/*
>>>> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
>>>> + * Author:
>>>> + *   Yuvaraj C D <yuvaraj.cd@samsung.com>
>>>> + *
>>>> + * This program is free software; you can redistribute  it and/or modify it
>>>> + * under  the terms of  the GNU General  Public License as published by the
>>>> + * Free Software Foundation;  either version 2 of the  License, or (at your
>>>> + * option) any later version.
>>>> + *
>>>> + */
>>>> +
>>>> +#include <linux/kernel.h>
>>>> +#include <linux/i2c.h>
>>>> +#include <linux/module.h>
>>>> +#include "sata_phy_exynos5250.h"
>>>> +
>>>> +static int exynos_sata_i2c_probe(struct i2c_client *client,
>>>> +             const struct i2c_device_id *i2c_id)
>>>> +{
>>>> +     sataphy_attach_i2c_client(client);
>>>> +
>>>> +     dev_info(&client->adapter->dev,
>>>> +             "attached %s into i2c adapter successfully\n",
>>>> +             client->name);
>>>> +
>>>> +     return 0;
>>>> +}
>>>> +
>>>> +static int exynos_sata_i2c_remove(struct i2c_client *client)
>>>> +{
>>>> +     dev_info(&client->adapter->dev,
>>>> +             "detached %s from i2c adapter successfully\n",
>>>> +             client->name);
>>>> +
>>>> +     return 0;
>>>> +}
>>>> +
>>>> +static const struct i2c_device_id phy_i2c_device_match[] = {
>>>> +     { "sata-phy-i2c", 0 },
>>>> +};
>>>> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
>>>> +
>>>> +struct i2c_driver sataphy_i2c_driver = {
>>>> +     .probe    = exynos_sata_i2c_probe,
>>>> +     .id_table = phy_i2c_device_match,
>>>> +     .remove         = exynos_sata_i2c_remove,
>>>> +     .driver   = {
>>>> +             .name = "sata-phy-i2c",
>>>> +             .owner = THIS_MODULE,
>>>> +             .of_match_table = (void *)phy_i2c_device_match,
>>>> +             },
>>>> +};
>>>
>>> As I just mentioned above, we can merge this driver with the below one.
>> True, Initially it was merged.But already existing drivers of which
>> are of similar to this kind were done in this way.
>> Please refer  /drivers/gpu/drm//exynos/exynos_hdmiphy.c
>
> Can you point to any discussions where it was decided to go with this approach?
Sorry,what I meant is exynos_hdmiphy.c is already exist in the
mainline with this approach.

Initially it was merged on my local patches(Not upstreamed).But after
referring to the
exynos_hdmiphy.c driver and with lot of internal discussions ,it was
decided to go with
the already existing approach.

>
> Thanks
> Kishon
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Kishon Vijay Abraham I Nov. 19, 2013, 9:52 a.m. UTC | #6
On Friday 15 November 2013 11:17 AM, Yuvaraj Kumar wrote:
> On Thu, Nov 14, 2013 at 11:18 AM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>> Hi,
>>
>> On Monday 07 October 2013 07:35 PM, Yuvaraj Cd wrote:
>>> On Tue, Oct 1, 2013 at 6:21 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>>>> On Tuesday 01 October 2013 12:03 PM, Yuvaraj Kumar C D wrote:
>>>>> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
>>>>> phy comprises of CMU and TRSV blocks which are of I2C register Map.
>>>>> So this patch also adds a i2c client driver, which is used configure
>>>>> the CMU and TRSV block of exynos5250 SATA PHY.
>>>>
>>>> Why not make the Exynos5250 sata phy as a i2c client driver instead?
>>>>>
>>>>> This patch incorporates the generic phy framework to deal with sata
>>>>> phy.
>>>>>
>>>>> This patch depends on the below patch
>>>>>       [1].drivers: phy: add generic PHY framework
>>>>>               by Kishon Vijay Abraham I<kishon@ti.com>
>>>>>
>>>>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
>>>>> Signed-off-by: Girish K S <ks.giri@samsung.com>
>>>>> Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
>>>>> ---
>>>>>  drivers/phy/Kconfig                      |    6 +
>>>>>  drivers/phy/Makefile                     |    1 +
>>>>>  drivers/phy/exynos/Kconfig               |    5 +
>>>>>  drivers/phy/exynos/Makefile              |    5 +
>>>>>  drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
>>>>>  drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
>>>>>  drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
>>>>>  7 files changed, 351 insertions(+)
>>>>>  create mode 100644 drivers/phy/exynos/Kconfig
>>>>>  create mode 100644 drivers/phy/exynos/Makefile
>>>>>  create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
>>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h
>>>>>
>>>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>>>> index 5f85909..ab3d1c6 100644
>>>>> --- a/drivers/phy/Kconfig
>>>>> +++ b/drivers/phy/Kconfig
>>>>> @@ -11,3 +11,9 @@ menuconfig GENERIC_PHY
>>>>>         devices present in the kernel. This layer will have the generic
>>>>>         API by which phy drivers can create PHY using the phy framework and
>>>>>         phy users can obtain reference to the PHY.
>>>>> +
>>>>> +if GENERIC_PHY
>>>>
>>>> NAK. Just select GENERIC_PHY from your driver Kconfig.
>>>>> +
>>>>> +source "drivers/phy/exynos/Kconfig"
>>>>> +
>>>>> +endif
>>>>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>>>>> index 9e9560f..e0223d7 100644
>>>>> --- a/drivers/phy/Makefile
>>>>> +++ b/drivers/phy/Makefile
>>>>> @@ -3,3 +3,4 @@
>>>>>  #
>>>>>
>>>>>  obj-$(CONFIG_GENERIC_PHY)    += phy-core.o
>>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += exynos/
>>>>
>>>> simply have phy-exynos5250 in drivers/phy.
>>> ok.
>>>>> diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
>>>>> new file mode 100644
>>>>> index 0000000..fa125fb
>>>>> --- /dev/null
>>>>> +++ b/drivers/phy/exynos/Kconfig
>>>>> @@ -0,0 +1,5 @@
>>>>> +config PHY_SAMSUNG_SATA
>>>>> +     tristate "Samsung Sata SerDes/PHY driver"
>>>>> +     help
>>>>> +       Support for Samsung sata SerDes/Phy found on Samsung
>>>>> +       SoCs.
>>>>> diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
>>>>> new file mode 100644
>>>>> index 0000000..50dc7eb
>>>>> --- /dev/null
>>>>> +++ b/drivers/phy/exynos/Makefile
>>>>> @@ -0,0 +1,5 @@
>>>>> +#
>>>>> +# Makefile for the exynos phy drivers.
>>>>> +#
>>>>> +ccflags-y := -Idrivers/phy/exynos
>>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += sata_phy_exynos5250.o exynos5250_phy_i2c.o
>>>>> diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>> new file mode 100644
>>>>> index 0000000..9c75d3b
>>>>> --- /dev/null
>>>>> +++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>> @@ -0,0 +1,53 @@
>>>>> +/*
>>>>> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
>>>>> + * Author:
>>>>> + *   Yuvaraj C D <yuvaraj.cd@samsung.com>
>>>>> + *
>>>>> + * This program is free software; you can redistribute  it and/or modify it
>>>>> + * under  the terms of  the GNU General  Public License as published by the
>>>>> + * Free Software Foundation;  either version 2 of the  License, or (at your
>>>>> + * option) any later version.
>>>>> + *
>>>>> + */
>>>>> +
>>>>> +#include <linux/kernel.h>
>>>>> +#include <linux/i2c.h>
>>>>> +#include <linux/module.h>
>>>>> +#include "sata_phy_exynos5250.h"
>>>>> +
>>>>> +static int exynos_sata_i2c_probe(struct i2c_client *client,
>>>>> +             const struct i2c_device_id *i2c_id)
>>>>> +{
>>>>> +     sataphy_attach_i2c_client(client);
>>>>> +
>>>>> +     dev_info(&client->adapter->dev,
>>>>> +             "attached %s into i2c adapter successfully\n",
>>>>> +             client->name);
>>>>> +
>>>>> +     return 0;
>>>>> +}
>>>>> +
>>>>> +static int exynos_sata_i2c_remove(struct i2c_client *client)
>>>>> +{
>>>>> +     dev_info(&client->adapter->dev,
>>>>> +             "detached %s from i2c adapter successfully\n",
>>>>> +             client->name);
>>>>> +
>>>>> +     return 0;
>>>>> +}
>>>>> +
>>>>> +static const struct i2c_device_id phy_i2c_device_match[] = {
>>>>> +     { "sata-phy-i2c", 0 },
>>>>> +};
>>>>> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
>>>>> +
>>>>> +struct i2c_driver sataphy_i2c_driver = {
>>>>> +     .probe    = exynos_sata_i2c_probe,
>>>>> +     .id_table = phy_i2c_device_match,
>>>>> +     .remove         = exynos_sata_i2c_remove,
>>>>> +     .driver   = {
>>>>> +             .name = "sata-phy-i2c",
>>>>> +             .owner = THIS_MODULE,
>>>>> +             .of_match_table = (void *)phy_i2c_device_match,
>>>>> +             },
>>>>> +};
>>>>
>>>> As I just mentioned above, we can merge this driver with the below one.
>>> True, Initially it was merged.But already existing drivers of which
>>> are of similar to this kind were done in this way.
>>> Please refer  /drivers/gpu/drm//exynos/exynos_hdmiphy.c
>>
>> Can you point to any discussions where it was decided to go with this approach?
> Sorry,what I meant is exynos_hdmiphy.c is already exist in the
> mainline with this approach.
> 
> Initially it was merged on my local patches(Not upstreamed).But after
> referring to the
> exynos_hdmiphy.c driver and with lot of internal discussions ,it was
> decided to go with

I don't have any idea about the internal discussions whatever you had. IMO
Exynos5250 sata phy driver should be modelled as an i2c client driver if you
don't have a good reason to do otherwise.

Thanks
Kishon

> the already existing approach.
> 
>>
>> Thanks
>> Kishon

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Yuvaraj CD Nov. 19, 2013, 10:12 a.m. UTC | #7
On Tue, Nov 19, 2013 at 3:22 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
> On Friday 15 November 2013 11:17 AM, Yuvaraj Kumar wrote:
>> On Thu, Nov 14, 2013 at 11:18 AM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>>> Hi,
>>>
>>> On Monday 07 October 2013 07:35 PM, Yuvaraj Cd wrote:
>>>> On Tue, Oct 1, 2013 at 6:21 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>>>>> On Tuesday 01 October 2013 12:03 PM, Yuvaraj Kumar C D wrote:
>>>>>> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
>>>>>> phy comprises of CMU and TRSV blocks which are of I2C register Map.
>>>>>> So this patch also adds a i2c client driver, which is used configure
>>>>>> the CMU and TRSV block of exynos5250 SATA PHY.
>>>>>
>>>>> Why not make the Exynos5250 sata phy as a i2c client driver instead?
>>>>>>
>>>>>> This patch incorporates the generic phy framework to deal with sata
>>>>>> phy.
>>>>>>
>>>>>> This patch depends on the below patch
>>>>>>       [1].drivers: phy: add generic PHY framework
>>>>>>               by Kishon Vijay Abraham I<kishon@ti.com>
>>>>>>
>>>>>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
>>>>>> Signed-off-by: Girish K S <ks.giri@samsung.com>
>>>>>> Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
>>>>>> ---
>>>>>>  drivers/phy/Kconfig                      |    6 +
>>>>>>  drivers/phy/Makefile                     |    1 +
>>>>>>  drivers/phy/exynos/Kconfig               |    5 +
>>>>>>  drivers/phy/exynos/Makefile              |    5 +
>>>>>>  drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
>>>>>>  drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
>>>>>>  drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
>>>>>>  7 files changed, 351 insertions(+)
>>>>>>  create mode 100644 drivers/phy/exynos/Kconfig
>>>>>>  create mode 100644 drivers/phy/exynos/Makefile
>>>>>>  create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
>>>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h
>>>>>>
>>>>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>>>>> index 5f85909..ab3d1c6 100644
>>>>>> --- a/drivers/phy/Kconfig
>>>>>> +++ b/drivers/phy/Kconfig
>>>>>> @@ -11,3 +11,9 @@ menuconfig GENERIC_PHY
>>>>>>         devices present in the kernel. This layer will have the generic
>>>>>>         API by which phy drivers can create PHY using the phy framework and
>>>>>>         phy users can obtain reference to the PHY.
>>>>>> +
>>>>>> +if GENERIC_PHY
>>>>>
>>>>> NAK. Just select GENERIC_PHY from your driver Kconfig.
>>>>>> +
>>>>>> +source "drivers/phy/exynos/Kconfig"
>>>>>> +
>>>>>> +endif
>>>>>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>>>>>> index 9e9560f..e0223d7 100644
>>>>>> --- a/drivers/phy/Makefile
>>>>>> +++ b/drivers/phy/Makefile
>>>>>> @@ -3,3 +3,4 @@
>>>>>>  #
>>>>>>
>>>>>>  obj-$(CONFIG_GENERIC_PHY)    += phy-core.o
>>>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += exynos/
>>>>>
>>>>> simply have phy-exynos5250 in drivers/phy.
>>>> ok.
>>>>>> diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
>>>>>> new file mode 100644
>>>>>> index 0000000..fa125fb
>>>>>> --- /dev/null
>>>>>> +++ b/drivers/phy/exynos/Kconfig
>>>>>> @@ -0,0 +1,5 @@
>>>>>> +config PHY_SAMSUNG_SATA
>>>>>> +     tristate "Samsung Sata SerDes/PHY driver"
>>>>>> +     help
>>>>>> +       Support for Samsung sata SerDes/Phy found on Samsung
>>>>>> +       SoCs.
>>>>>> diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
>>>>>> new file mode 100644
>>>>>> index 0000000..50dc7eb
>>>>>> --- /dev/null
>>>>>> +++ b/drivers/phy/exynos/Makefile
>>>>>> @@ -0,0 +1,5 @@
>>>>>> +#
>>>>>> +# Makefile for the exynos phy drivers.
>>>>>> +#
>>>>>> +ccflags-y := -Idrivers/phy/exynos
>>>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += sata_phy_exynos5250.o exynos5250_phy_i2c.o
>>>>>> diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>>> new file mode 100644
>>>>>> index 0000000..9c75d3b
>>>>>> --- /dev/null
>>>>>> +++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>>> @@ -0,0 +1,53 @@
>>>>>> +/*
>>>>>> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
>>>>>> + * Author:
>>>>>> + *   Yuvaraj C D <yuvaraj.cd@samsung.com>
>>>>>> + *
>>>>>> + * This program is free software; you can redistribute  it and/or modify it
>>>>>> + * under  the terms of  the GNU General  Public License as published by the
>>>>>> + * Free Software Foundation;  either version 2 of the  License, or (at your
>>>>>> + * option) any later version.
>>>>>> + *
>>>>>> + */
>>>>>> +
>>>>>> +#include <linux/kernel.h>
>>>>>> +#include <linux/i2c.h>
>>>>>> +#include <linux/module.h>
>>>>>> +#include "sata_phy_exynos5250.h"
>>>>>> +
>>>>>> +static int exynos_sata_i2c_probe(struct i2c_client *client,
>>>>>> +             const struct i2c_device_id *i2c_id)
>>>>>> +{
>>>>>> +     sataphy_attach_i2c_client(client);
>>>>>> +
>>>>>> +     dev_info(&client->adapter->dev,
>>>>>> +             "attached %s into i2c adapter successfully\n",
>>>>>> +             client->name);
>>>>>> +
>>>>>> +     return 0;
>>>>>> +}
>>>>>> +
>>>>>> +static int exynos_sata_i2c_remove(struct i2c_client *client)
>>>>>> +{
>>>>>> +     dev_info(&client->adapter->dev,
>>>>>> +             "detached %s from i2c adapter successfully\n",
>>>>>> +             client->name);
>>>>>> +
>>>>>> +     return 0;
>>>>>> +}
>>>>>> +
>>>>>> +static const struct i2c_device_id phy_i2c_device_match[] = {
>>>>>> +     { "sata-phy-i2c", 0 },
>>>>>> +};
>>>>>> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
>>>>>> +
>>>>>> +struct i2c_driver sataphy_i2c_driver = {
>>>>>> +     .probe    = exynos_sata_i2c_probe,
>>>>>> +     .id_table = phy_i2c_device_match,
>>>>>> +     .remove         = exynos_sata_i2c_remove,
>>>>>> +     .driver   = {
>>>>>> +             .name = "sata-phy-i2c",
>>>>>> +             .owner = THIS_MODULE,
>>>>>> +             .of_match_table = (void *)phy_i2c_device_match,
>>>>>> +             },
>>>>>> +};
>>>>>
>>>>> As I just mentioned above, we can merge this driver with the below one.
>>>> True, Initially it was merged.But already existing drivers of which
>>>> are of similar to this kind were done in this way.
>>>> Please refer  /drivers/gpu/drm//exynos/exynos_hdmiphy.c
>>>
>>> Can you point to any discussions where it was decided to go with this approach?
>> Sorry,what I meant is exynos_hdmiphy.c is already exist in the
>> mainline with this approach.
>>
>> Initially it was merged on my local patches(Not upstreamed).But after
>> referring to the
>> exynos_hdmiphy.c driver and with lot of internal discussions ,it was
>> decided to go with
>
> I don't have any idea about the internal discussions whatever you had. IMO
> Exynos5250 sata phy driver should be modelled as an i2c client driver if you
> don't have a good reason to do otherwise.
In Exynos5250,some of the registers of SATA PHY controller are I/O
mapped and some are accessible
only through I2C controller.
As the whole registers of SATA PHY controller cannot be accessible
through I2C bus, it cannot be made as an i2c client driver.
>
> Thanks
> Kishon
>
>> the already existing approach.
>>
>>>
>>> Thanks
>>> Kishon
>
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Kishon Vijay Abraham I Nov. 19, 2013, 10:40 a.m. UTC | #8
On Tuesday 19 November 2013 03:42 PM, Yuvaraj Kumar wrote:
> On Tue, Nov 19, 2013 at 3:22 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>> On Friday 15 November 2013 11:17 AM, Yuvaraj Kumar wrote:
>>> On Thu, Nov 14, 2013 at 11:18 AM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>>>> Hi,
>>>>
>>>> On Monday 07 October 2013 07:35 PM, Yuvaraj Cd wrote:
>>>>> On Tue, Oct 1, 2013 at 6:21 PM, Kishon Vijay Abraham I <kishon@ti.com> wrote:
>>>>>> On Tuesday 01 October 2013 12:03 PM, Yuvaraj Kumar C D wrote:
>>>>>>> This patch adds the sata phy driver for Exynos5250.Exynos5250 sata
>>>>>>> phy comprises of CMU and TRSV blocks which are of I2C register Map.
>>>>>>> So this patch also adds a i2c client driver, which is used configure
>>>>>>> the CMU and TRSV block of exynos5250 SATA PHY.
>>>>>>
>>>>>> Why not make the Exynos5250 sata phy as a i2c client driver instead?
>>>>>>>
>>>>>>> This patch incorporates the generic phy framework to deal with sata
>>>>>>> phy.
>>>>>>>
>>>>>>> This patch depends on the below patch
>>>>>>>       [1].drivers: phy: add generic PHY framework
>>>>>>>               by Kishon Vijay Abraham I<kishon@ti.com>
>>>>>>>
>>>>>>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
>>>>>>> Signed-off-by: Girish K S <ks.giri@samsung.com>
>>>>>>> Signed-off-by: Vasanth Ananthan <vasanth.a@samsung.com>
>>>>>>> ---
>>>>>>>  drivers/phy/Kconfig                      |    6 +
>>>>>>>  drivers/phy/Makefile                     |    1 +
>>>>>>>  drivers/phy/exynos/Kconfig               |    5 +
>>>>>>>  drivers/phy/exynos/Makefile              |    5 +
>>>>>>>  drivers/phy/exynos/exynos5250_phy_i2c.c  |   53 +++++++
>>>>>>>  drivers/phy/exynos/sata_phy_exynos5250.c |  248 ++++++++++++++++++++++++++++++
>>>>>>>  drivers/phy/exynos/sata_phy_exynos5250.h |   33 ++++
>>>>>>>  7 files changed, 351 insertions(+)
>>>>>>>  create mode 100644 drivers/phy/exynos/Kconfig
>>>>>>>  create mode 100644 drivers/phy/exynos/Makefile
>>>>>>>  create mode 100644 drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.c
>>>>>>>  create mode 100644 drivers/phy/exynos/sata_phy_exynos5250.h
>>>>>>>
>>>>>>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>>>>>>> index 5f85909..ab3d1c6 100644
>>>>>>> --- a/drivers/phy/Kconfig
>>>>>>> +++ b/drivers/phy/Kconfig
>>>>>>> @@ -11,3 +11,9 @@ menuconfig GENERIC_PHY
>>>>>>>         devices present in the kernel. This layer will have the generic
>>>>>>>         API by which phy drivers can create PHY using the phy framework and
>>>>>>>         phy users can obtain reference to the PHY.
>>>>>>> +
>>>>>>> +if GENERIC_PHY
>>>>>>
>>>>>> NAK. Just select GENERIC_PHY from your driver Kconfig.
>>>>>>> +
>>>>>>> +source "drivers/phy/exynos/Kconfig"
>>>>>>> +
>>>>>>> +endif
>>>>>>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>>>>>>> index 9e9560f..e0223d7 100644
>>>>>>> --- a/drivers/phy/Makefile
>>>>>>> +++ b/drivers/phy/Makefile
>>>>>>> @@ -3,3 +3,4 @@
>>>>>>>  #
>>>>>>>
>>>>>>>  obj-$(CONFIG_GENERIC_PHY)    += phy-core.o
>>>>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += exynos/
>>>>>>
>>>>>> simply have phy-exynos5250 in drivers/phy.
>>>>> ok.
>>>>>>> diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
>>>>>>> new file mode 100644
>>>>>>> index 0000000..fa125fb
>>>>>>> --- /dev/null
>>>>>>> +++ b/drivers/phy/exynos/Kconfig
>>>>>>> @@ -0,0 +1,5 @@
>>>>>>> +config PHY_SAMSUNG_SATA
>>>>>>> +     tristate "Samsung Sata SerDes/PHY driver"
>>>>>>> +     help
>>>>>>> +       Support for Samsung sata SerDes/Phy found on Samsung
>>>>>>> +       SoCs.
>>>>>>> diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
>>>>>>> new file mode 100644
>>>>>>> index 0000000..50dc7eb
>>>>>>> --- /dev/null
>>>>>>> +++ b/drivers/phy/exynos/Makefile
>>>>>>> @@ -0,0 +1,5 @@
>>>>>>> +#
>>>>>>> +# Makefile for the exynos phy drivers.
>>>>>>> +#
>>>>>>> +ccflags-y := -Idrivers/phy/exynos
>>>>>>> +obj-$(CONFIG_PHY_SAMSUNG_SATA)       += sata_phy_exynos5250.o exynos5250_phy_i2c.o
>>>>>>> diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>>>> new file mode 100644
>>>>>>> index 0000000..9c75d3b
>>>>>>> --- /dev/null
>>>>>>> +++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
>>>>>>> @@ -0,0 +1,53 @@
>>>>>>> +/*
>>>>>>> + * Copyright (C) 2013 Samsung Electronics Co.Ltd
>>>>>>> + * Author:
>>>>>>> + *   Yuvaraj C D <yuvaraj.cd@samsung.com>
>>>>>>> + *
>>>>>>> + * This program is free software; you can redistribute  it and/or modify it
>>>>>>> + * under  the terms of  the GNU General  Public License as published by the
>>>>>>> + * Free Software Foundation;  either version 2 of the  License, or (at your
>>>>>>> + * option) any later version.
>>>>>>> + *
>>>>>>> + */
>>>>>>> +
>>>>>>> +#include <linux/kernel.h>
>>>>>>> +#include <linux/i2c.h>
>>>>>>> +#include <linux/module.h>
>>>>>>> +#include "sata_phy_exynos5250.h"
>>>>>>> +
>>>>>>> +static int exynos_sata_i2c_probe(struct i2c_client *client,
>>>>>>> +             const struct i2c_device_id *i2c_id)
>>>>>>> +{
>>>>>>> +     sataphy_attach_i2c_client(client);
>>>>>>> +
>>>>>>> +     dev_info(&client->adapter->dev,
>>>>>>> +             "attached %s into i2c adapter successfully\n",
>>>>>>> +             client->name);
>>>>>>> +
>>>>>>> +     return 0;
>>>>>>> +}
>>>>>>> +
>>>>>>> +static int exynos_sata_i2c_remove(struct i2c_client *client)
>>>>>>> +{
>>>>>>> +     dev_info(&client->adapter->dev,
>>>>>>> +             "detached %s from i2c adapter successfully\n",
>>>>>>> +             client->name);
>>>>>>> +
>>>>>>> +     return 0;
>>>>>>> +}
>>>>>>> +
>>>>>>> +static const struct i2c_device_id phy_i2c_device_match[] = {
>>>>>>> +     { "sata-phy-i2c", 0 },
>>>>>>> +};
>>>>>>> +MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
>>>>>>> +
>>>>>>> +struct i2c_driver sataphy_i2c_driver = {
>>>>>>> +     .probe    = exynos_sata_i2c_probe,
>>>>>>> +     .id_table = phy_i2c_device_match,
>>>>>>> +     .remove         = exynos_sata_i2c_remove,
>>>>>>> +     .driver   = {
>>>>>>> +             .name = "sata-phy-i2c",
>>>>>>> +             .owner = THIS_MODULE,
>>>>>>> +             .of_match_table = (void *)phy_i2c_device_match,
>>>>>>> +             },
>>>>>>> +};
>>>>>>
>>>>>> As I just mentioned above, we can merge this driver with the below one.
>>>>> True, Initially it was merged.But already existing drivers of which
>>>>> are of similar to this kind were done in this way.
>>>>> Please refer  /drivers/gpu/drm//exynos/exynos_hdmiphy.c
>>>>
>>>> Can you point to any discussions where it was decided to go with this approach?
>>> Sorry,what I meant is exynos_hdmiphy.c is already exist in the
>>> mainline with this approach.
>>>
>>> Initially it was merged on my local patches(Not upstreamed).But after
>>> referring to the
>>> exynos_hdmiphy.c driver and with lot of internal discussions ,it was
>>> decided to go with
>>
>> I don't have any idea about the internal discussions whatever you had. IMO
>> Exynos5250 sata phy driver should be modelled as an i2c client driver if you
>> don't have a good reason to do otherwise.
> In Exynos5250,some of the registers of SATA PHY controller are I/O
> mapped and some are accessible
> only through I2C controller.
> As the whole registers of SATA PHY controller cannot be accessible
> through I2C bus, it cannot be made as an i2c client driver.

Ah ok.. Makes sense. Thanks for clarifying.

Cheers
Kishon

>>
>> Thanks
>> Kishon
>>
>>> the already existing approach.
>>>
>>>>
>>>> Thanks
>>>> Kishon
>>

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diff mbox

Patch

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 5f85909..ab3d1c6 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -11,3 +11,9 @@  menuconfig GENERIC_PHY
 	  devices present in the kernel. This layer will have the generic
 	  API by which phy drivers can create PHY using the phy framework and
 	  phy users can obtain reference to the PHY.
+
+if GENERIC_PHY
+
+source "drivers/phy/exynos/Kconfig"
+
+endif
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 9e9560f..e0223d7 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -3,3 +3,4 @@ 
 #
 
 obj-$(CONFIG_GENERIC_PHY)	+= phy-core.o
+obj-$(CONFIG_PHY_SAMSUNG_SATA)	+= exynos/
diff --git a/drivers/phy/exynos/Kconfig b/drivers/phy/exynos/Kconfig
new file mode 100644
index 0000000..fa125fb
--- /dev/null
+++ b/drivers/phy/exynos/Kconfig
@@ -0,0 +1,5 @@ 
+config PHY_SAMSUNG_SATA
+	tristate "Samsung Sata SerDes/PHY driver"
+	help
+	  Support for Samsung sata SerDes/Phy found on Samsung
+	  SoCs.
diff --git a/drivers/phy/exynos/Makefile b/drivers/phy/exynos/Makefile
new file mode 100644
index 0000000..50dc7eb
--- /dev/null
+++ b/drivers/phy/exynos/Makefile
@@ -0,0 +1,5 @@ 
+#
+# Makefile for the exynos phy drivers.
+#
+ccflags-y := -Idrivers/phy/exynos
+obj-$(CONFIG_PHY_SAMSUNG_SATA)	+= sata_phy_exynos5250.o exynos5250_phy_i2c.o
diff --git a/drivers/phy/exynos/exynos5250_phy_i2c.c b/drivers/phy/exynos/exynos5250_phy_i2c.c
new file mode 100644
index 0000000..9c75d3b
--- /dev/null
+++ b/drivers/phy/exynos/exynos5250_phy_i2c.c
@@ -0,0 +1,53 @@ 
+/*
+ * Copyright (C) 2013 Samsung Electronics Co.Ltd
+ * Author:
+ *	Yuvaraj C D <yuvaraj.cd@samsung.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include "sata_phy_exynos5250.h"
+
+static int exynos_sata_i2c_probe(struct i2c_client *client,
+		const struct i2c_device_id *i2c_id)
+{
+	sataphy_attach_i2c_client(client);
+
+	dev_info(&client->adapter->dev,
+		"attached %s into i2c adapter successfully\n",
+		client->name);
+
+	return 0;
+}
+
+static int exynos_sata_i2c_remove(struct i2c_client *client)
+{
+	dev_info(&client->adapter->dev,
+		"detached %s from i2c adapter successfully\n",
+		client->name);
+
+	return 0;
+}
+
+static const struct i2c_device_id phy_i2c_device_match[] = {
+	{ "sata-phy-i2c", 0 },
+};
+MODULE_DEVICE_TABLE(of, phy_i2c_device_match);
+
+struct i2c_driver sataphy_i2c_driver = {
+	.probe    = exynos_sata_i2c_probe,
+	.id_table = phy_i2c_device_match,
+	.remove		= exynos_sata_i2c_remove,
+	.driver   = {
+		.name = "sata-phy-i2c",
+		.owner = THIS_MODULE,
+		.of_match_table = (void *)phy_i2c_device_match,
+		},
+};
diff --git a/drivers/phy/exynos/sata_phy_exynos5250.c b/drivers/phy/exynos/sata_phy_exynos5250.c
new file mode 100644
index 0000000..726c10e
--- /dev/null
+++ b/drivers/phy/exynos/sata_phy_exynos5250.c
@@ -0,0 +1,248 @@ 
+/*
+ * Samsung SATA SerDes(PHY) driver
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Authors: Girish K S <ks.giri@samsung.com>
+ *         Yuvaraj Kumar C D <yuvaraj.cd@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/clk.h>
+#include "sata_phy_exynos5250.h"
+
+static struct i2c_client *phy_i2c_client;
+
+struct exynos_sata_phy {
+	struct phy *phy;
+	struct clk *phyclk;
+	void __iomem *regs;
+	void __iomem *pmureg;
+};
+
+static bool wait_for_reg_status(void __iomem *base, u32 reg, u32 checkbit,
+				u32 status)
+{
+	unsigned long timeout = jiffies + usecs_to_jiffies(1000);
+	while (time_before(jiffies, timeout)) {
+		if ((readl(base + reg) & checkbit) == status)
+			return true;
+	}
+	return false;
+}
+
+void sataphy_attach_i2c_client(struct i2c_client *sata_phy)
+{
+	if (sata_phy)
+		phy_i2c_client = sata_phy;
+}
+
+static int __set_phy_state(struct exynos_sata_phy *state, unsigned int on)
+{
+	u32 reg;
+
+	reg = readl(state->pmureg);
+	if (on)
+		reg |= EXYNOS_SATA_PHY_EN;
+	else
+		reg &= ~EXYNOS_SATA_PHY_EN;
+	writel(reg, state->pmureg);
+
+	return 0;
+}
+
+static int exynos_sata_phy_power_on(struct phy *phy)
+{
+	struct exynos_sata_phy *state = phy_get_drvdata(phy);
+
+	return __set_phy_state(state, 1);
+}
+
+static int exynos_sata_phy_power_off(struct phy *phy)
+{
+	struct exynos_sata_phy *state = phy_get_drvdata(phy);
+
+	return __set_phy_state(state, 0);
+}
+
+static int exynos_sataphy_parse_dt(struct device *dev,
+				struct exynos_sata_phy *sata)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *sataphy_pmu;
+
+	sataphy_pmu = of_get_child_by_name(np, "sataphy-pmu");
+	if (!sataphy_pmu) {
+		dev_err(dev, "No PMU interface for sata-phy\n");
+		return -ENODEV;
+	}
+
+	sata->pmureg = of_iomap(sataphy_pmu, 0);
+	if (!sata->pmureg) {
+		dev_err(dev, "Can't get sata-phy pmu control register\n");
+		of_node_put(sataphy_pmu);
+		return -ENXIO;
+	}
+
+	of_node_put(sataphy_pmu);
+	return 0;
+}
+
+static int exynos_sata_phy_init(struct phy *phy)
+{
+	u32 val;
+	int ret = 0;
+	u8 buf[] = { 0x3A, 0x0B };
+	struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
+
+	if (!phy_i2c_client)
+		return -EPROBE_DEFER;
+
+	writel(EXYNOS_SATA_PHY_EN, sata_phy->pmureg);
+
+	val = 0;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+	val |= 0xFF;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+	val |= LINK_RESET;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+	val |= RESET_CMN_RST_N;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+	val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
+	val &= ~PHCTRLM_REF_RATE;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
+
+	/* High speed enable for Gen3 */
+	val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
+	val |= PHCTRLM_HIGH_SPEED;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
+
+	val |= CTRL0_P0_PHY_CALIBRATED_SEL | CTRL0_P0_PHY_CALIBRATED;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_CTRL0);
+
+	writel(0x2, sata_phy->regs + EXYNOS5_SATA_MODE0);
+
+	ret = i2c_master_send(phy_i2c_client, buf, sizeof(buf));
+	if (ret < 0)
+		return -ENXIO;
+
+	/* release cmu reset */
+	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+	val &= ~RESET_CMN_RST_N;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+	val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
+	val |= RESET_CMN_RST_N;
+	writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
+
+	return (wait_for_reg_status(sata_phy->regs, EXYNOS5_SATA_PHSATA_STATM,
+		PHSTATM_PLL_LOCKED, 1)) ? 0 : -EINVAL;
+
+}
+
+static struct phy_ops exynos_sata_phy_ops = {
+	.init		= exynos_sata_phy_init,
+	.power_on	= exynos_sata_phy_power_on,
+	.power_off	= exynos_sata_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static int exynos_sata_phy_probe(struct platform_device *pdev)
+{
+	struct exynos_sata_phy *sata;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct phy_provider *phy_provider;
+	char label[9];
+	int ret = 0;
+
+	sata = devm_kzalloc(dev, sizeof(*sata), GFP_KERNEL);
+	if (!sata)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	sata->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(sata->regs))
+		return PTR_ERR(sata->regs);
+
+	dev_set_drvdata(dev, sata);
+
+	if (i2c_add_driver(&sataphy_i2c_driver)) {
+		dev_err(dev, "failed to register sataphy i2c driver\n");
+		return -ENOENT;
+	}
+
+	sata->phyclk = devm_clk_get(dev, "sata_phyctrl");
+	if (IS_ERR(sata->phyclk)) {
+		dev_err(dev, "failed to get clk for PHY\n");
+		return PTR_ERR(sata->phyclk);
+	}
+
+	ret = clk_prepare_enable(sata->phyclk);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable source clk\n");
+		return ret;
+	}
+
+	if (dev->of_node) {
+		ret = exynos_sataphy_parse_dt(dev, sata);
+		if (ret)
+			return ret;
+	}
+
+	phy_provider = devm_of_phy_provider_register(dev,
+					of_phy_simple_xlate);
+	if (IS_ERR(phy_provider))
+		return PTR_ERR(phy_provider);
+
+	snprintf(label, sizeof(label), "%s.%d", "sata-phy", pdev->id);
+
+	sata->phy = devm_phy_create(dev, pdev->id, &exynos_sata_phy_ops, label);
+	if (IS_ERR(sata->phy)) {
+		dev_err(dev, "failed to create PHY %s\n", label);
+		return PTR_ERR(sata->phy);
+	}
+	phy_set_drvdata(sata->phy, sata);
+
+	return 0;
+}
+
+static const struct of_device_id exynos_sata_phy_of_match[] = {
+	{ .compatible = "samsung,exynos5250-sata-phy" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, exynos_sata_phy_of_match);
+
+static struct platform_driver exynos_sata_phy_driver = {
+	.probe	= exynos_sata_phy_probe,
+	.driver = {
+		.of_match_table	= exynos_sata_phy_of_match,
+		.name  = "samsung,sata-phy",
+		.owner = THIS_MODULE,
+	}
+};
+module_platform_driver(exynos_sata_phy_driver);
+
+MODULE_DESCRIPTION("Samsung SerDes PHY driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("ks.giri <ks.giri@samsung.com>");
+MODULE_AUTHOR("Yuvaraj C D <yuvaraj.cd@samsung.com>");
diff --git a/drivers/phy/exynos/sata_phy_exynos5250.h b/drivers/phy/exynos/sata_phy_exynos5250.h
new file mode 100644
index 0000000..64e38a1
--- /dev/null
+++ b/drivers/phy/exynos/sata_phy_exynos5250.h
@@ -0,0 +1,33 @@ 
+/*
+ *
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * Author:
+ *	Yuvaraj Kumar C D<yuvaraj.cd@samsung.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#define EXYNOS5_SATA_RESET		0x4
+#define EXYNOS5_SATA_MODE0              0x10
+#define EXYNOS5_SATA_CTRL0              0x14
+#define EXYNOS5_SATA_STAT0		0x18
+#define EXYNOS5_SATA_PHSATA_CTRLM       0xE0
+#define EXYNOS5_SATA_PHSATA_CTRL0       0xE4
+#define EXYNOS5_SATA_PHSATA_STATM       0xF0
+#define EXYNOS5_SATA_PHSTAT0            0xF4
+
+#define RESET_CMN_RST_N			(1 << 1)
+#define LINK_RESET			0xF0000
+#define CTRL0_P0_PHY_CALIBRATED_SEL	(1 << 9)
+#define CTRL0_P0_PHY_CALIBRATED		(1 << 8)
+#define PHCTRLM_REF_RATE		(1 << 1)
+#define PHCTRLM_HIGH_SPEED		(1 << 0)
+#define PHSTATM_PLL_LOCKED		(1 << 0)
+#define SATA_PHY_CON_RESET              (LINK_RESET | 3F)
+#define EXYNOS_SATA_PHY_EN		(1 << 0)
+
+void sataphy_attach_i2c_client(struct i2c_client *sata_phy);
+extern struct i2c_driver sataphy_i2c_driver;