phy: exynos-dp-video: Use syscon support to control pmu register

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@samsung.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

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 7a6feea2a48b..15e0f2c7130f 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 8b3026e2af7f..53f44a0fe0aa 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 = {