Re: [PATCH v3 1/3] phy: exynos-dp-video: Use syscon support to control pmu register

[Kishon Vijay Abraham I]

On Thursday 18 September 2014 08:55 AM, Vivek Gautam wrote:
> Hi Kishon,
> 
> 
> On Wed, Sep 17, 2014 at 10:24 PM, Kishon Vijay Abraham I <kishon@xxxxxx> wrote:
>>
>>
>> On Tuesday 16 September 2014 10:32 AM, Vivek Gautam wrote:
>>> Currently the DP_PHY_ENABLE register is mapped in the driver,
>>> and accessed to control power to the PHY.
>>> With mfd-syscon and regmap interface available at our disposal,
>>> it's wise to use that instead of using a 'reg' property for the
>>> controller and allocating a memory resource for that.
>>>
>>> To facilitate this, we have added another compatible string
>>> for Exynso5420 SoC to acquire driver data which contains
>>> different DP-PHY-CONTROL register offset.
>>>
>>> Signed-off-by: Vivek Gautam <gautam.vivek@xxxxxxxxxxx>
>>> Cc: Jingoo Han <jg1.han@xxxxxxxxxxx>
>>> Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
>>
>> Taking this in linux-phy tree. If someone has already taken this patch, please
>> let me know.
> 
> Thanks for taking this. But just one check, i think i need to separate
> out the Documentation
> to a separate patch even before this driver patch. Isn't it ?

no.. that's alright.

Thanks
Kishon
> 
>>
>> Thanks
>> Kishon
>>
>>> ---
>>>
>>> Changes since v2:
>>>  - Using 'EXYNOS5_PHY_ENABLE' macro instead of 'EXYNOS_DPTX_PHY_ENABLE'
>>>    since that's available with us in "linux/mfd/syscon/exynos5-pmu.h" file.
>>>
>>> Changes since v1:
>>>  - state->regs should have been "struct regmap *" instead of
>>>    "void __iomem *". So corrected the same.
>>>
>>>  .../devicetree/bindings/phy/samsung-phy.txt        |    7 +-
>>>  drivers/phy/phy-exynos-dp-video.c                  |   79 +++++++++++++-------
>>>  2 files changed, 59 insertions(+), 27 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> index 7a6feea..15e0f2c 100644
>>> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
>>> @@ -17,8 +17,11 @@ Samsung EXYNOS SoC series Display Port PHY
>>>  -------------------------------------------------
>>>
>>>  Required properties:
>>> -- compatible : should be "samsung,exynos5250-dp-video-phy";
>>> -- reg : offset and length of the Display Port PHY register set;
>>> +- compatible : should be one of the following supported values:
>>> +      - "samsung,exynos5250-dp-video-phy"
>>> +      - "samsung,exynos5420-dp-video-phy"
>>> +- samsung,pmu-syscon: phandle for PMU system controller interface, used to
>>> +                   control pmu registers for power isolation.
>>>  - #phy-cells : from the generic PHY bindings, must be 0;
>>>
>>>  Samsung S5P/EXYNOS SoC series USB PHY
>>> diff --git a/drivers/phy/phy-exynos-dp-video.c b/drivers/phy/phy-exynos-dp-video.c
>>> index 8b3026e..53f44a0 100644
>>> --- a/drivers/phy/phy-exynos-dp-video.c
>>> +++ b/drivers/phy/phy-exynos-dp-video.c
>>> @@ -13,44 +13,55 @@
>>>  #include <linux/io.h>
>>>  #include <linux/kernel.h>
>>>  #include <linux/module.h>
>>> +#include <linux/mfd/syscon.h>
>>> +#include <linux/mfd/syscon/exynos5-pmu.h>
>>>  #include <linux/of.h>
>>>  #include <linux/of_address.h>
>>>  #include <linux/phy/phy.h>
>>>  #include <linux/platform_device.h>
>>> +#include <linux/regmap.h>
>>>
>>> -/* DPTX_PHY_CONTROL register */
>>> -#define EXYNOS_DPTX_PHY_ENABLE               (1 << 0)
>>> +struct exynos_dp_video_phy_drvdata {
>>> +     u32 phy_ctrl_offset;
>>> +};
>>>
>>>  struct exynos_dp_video_phy {
>>> -     void __iomem *regs;
>>> +     struct regmap *regs;
>>> +     const struct exynos_dp_video_phy_drvdata *drvdata;
>>>  };
>>>
>>> -static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int on)
>>> +static void exynos_dp_video_phy_pwr_isol(struct exynos_dp_video_phy *state,
>>> +                                                     unsigned int on)
>>>  {
>>> -     u32 reg;
>>> +     unsigned int val;
>>> +
>>> +     if (IS_ERR(state->regs))
>>> +             return;
>>>
>>> -     reg = readl(state->regs);
>>> -     if (on)
>>> -             reg |= EXYNOS_DPTX_PHY_ENABLE;
>>> -     else
>>> -             reg &= ~EXYNOS_DPTX_PHY_ENABLE;
>>> -     writel(reg, state->regs);
>>> +     val = on ? 0 : EXYNOS5_PHY_ENABLE;
>>>
>>> -     return 0;
>>> +     regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
>>> +                        EXYNOS5_PHY_ENABLE, val);
>>>  }
>>>
>>>  static int exynos_dp_video_phy_power_on(struct phy *phy)
>>>  {
>>>       struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
>>>
>>> -     return __set_phy_state(state, 1);
>>> +     /* Disable power isolation on DP-PHY */
>>> +     exynos_dp_video_phy_pwr_isol(state, 0);
>>> +
>>> +     return 0;
>>>  }
>>>
>>>  static int exynos_dp_video_phy_power_off(struct phy *phy)
>>>  {
>>>       struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
>>>
>>> -     return __set_phy_state(state, 0);
>>> +     /* Enable power isolation on DP-PHY */
>>> +     exynos_dp_video_phy_pwr_isol(state, 1);
>>> +
>>> +     return 0;
>>>  }
>>>
>>>  static struct phy_ops exynos_dp_video_phy_ops = {
>>> @@ -59,11 +70,31 @@ static struct phy_ops exynos_dp_video_phy_ops = {
>>>       .owner          = THIS_MODULE,
>>>  };
>>>
>>> +static const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
>>> +     .phy_ctrl_offset        = EXYNOS5_DPTX_PHY_CONTROL,
>>> +};
>>> +
>>> +static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
>>> +     .phy_ctrl_offset        = EXYNOS5420_DPTX_PHY_CONTROL,
>>> +};
>>> +
>>> +static const struct of_device_id exynos_dp_video_phy_of_match[] = {
>>> +     {
>>> +             .compatible = "samsung,exynos5250-dp-video-phy",
>>> +             .data = &exynos5250_dp_video_phy,
>>> +     }, {
>>> +             .compatible = "samsung,exynos5420-dp-video-phy",
>>> +             .data = &exynos5420_dp_video_phy,
>>> +     },
>>> +     { },
>>> +};
>>> +MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
>>> +
>>>  static int exynos_dp_video_phy_probe(struct platform_device *pdev)
>>>  {
>>>       struct exynos_dp_video_phy *state;
>>>       struct device *dev = &pdev->dev;
>>> -     struct resource *res;
>>> +     const struct of_device_id *match;
>>>       struct phy_provider *phy_provider;
>>>       struct phy *phy;
>>>
>>> @@ -71,11 +102,15 @@ static int exynos_dp_video_phy_probe(struct platform_device *pdev)
>>>       if (!state)
>>>               return -ENOMEM;
>>>
>>> -     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> -
>>> -     state->regs = devm_ioremap_resource(dev, res);
>>> -     if (IS_ERR(state->regs))
>>> +     state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
>>> +                                                   "samsung,pmu-syscon");
>>> +     if (IS_ERR(state->regs)) {
>>> +             dev_err(dev, "Failed to lookup PMU regmap\n");
>>>               return PTR_ERR(state->regs);
>>> +     }
>>> +
>>> +     match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node);
>>> +     state->drvdata = match->data;
>>>
>>>       phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops, NULL);
>>>       if (IS_ERR(phy)) {
>>> @@ -89,12 +124,6 @@ static int exynos_dp_video_phy_probe(struct platform_device *pdev)
>>>       return PTR_ERR_OR_ZERO(phy_provider);
>>>  }
>>>
>>> -static const struct of_device_id exynos_dp_video_phy_of_match[] = {
>>> -     { .compatible = "samsung,exynos5250-dp-video-phy" },
>>> -     { },
>>> -};
>>> -MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
>>> -
>>>  static struct platform_driver exynos_dp_video_phy_driver = {
>>>       .probe  = exynos_dp_video_phy_probe,
>>>       .driver = {
>>>
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