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Date: Thu, 18 Sep 2014 08:55:58 +0530
From: Vivek Gautam <gautam.vivek@...sung.com>
To: Kishon Vijay Abraham I <kishon@...com>
Cc: dri-devel@...ts.freedesktop.org,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
inki.dae@...sung.com, Sean Paul <seanpaul@...gle.com>,
Jingoo Han <jg1.han@...sung.com>, ajaykumar.rs@...sung.com
Subject: Re: [PATCH v3 1/3] phy: exynos-dp-video: Use syscon support to
control pmu register
Hi Kishon,
On Wed, Sep 17, 2014 at 10:24 PM, Kishon Vijay Abraham I <kishon@...com> 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@...sung.com>
>> Cc: Jingoo Han <jg1.han@...sung.com>
>> Cc: Kishon Vijay Abraham I <kishon@...com>
>
> 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 ?
>
> 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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--
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India
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