Re: [PATCH v3 1/3] phy: exynos-dp-video: Use syscon support to control pmu register
From: Kishon Vijay Abraham I
Date: Wed Sep 17 2014 - 12:54:50 EST
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
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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