phy: exynos5-usbdrd: Add facility for VBUS-BOOST-5V supply

Some Exynos boards have a separate regulator controlling a
Boost 5V supply which goes as input for VBUS regulator.
So adding a control for the same in driver, to enable
vbus supply on the port.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

1 files changed, 30 insertions, 2 deletions

diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
index 99ba56dc63dd..04374018425f 100644
--- a/drivers/phy/phy-exynos5-usbdrd.c
+++ b/drivers/phy/phy-exynos5-usbdrd.c
@@ -159,6 +159,8 @@ struct exynos5_usbdrd_phy_drvdata {
  *             reference clocks' for SS and HS operations
  * @ref_clk: reference clock to PHY block from which PHY's
  *           operational clocks are derived
+ * vbus: VBUS regulator for phy
+ * vbus_boost: Boost regulator for VBUS present on few Exynos boards
  */
 struct exynos5_usbdrd_phy {
         struct device *dev;
@@ -178,6 +180,7 @@ struct exynos5_usbdrd_phy {
         u32 extrefclk;
         struct clk *ref_clk;
         struct regulator *vbus;
+        struct regulator *vbus_boost;
 };
 
 static inline
@@ -460,11 +463,20 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)
         }
 
         /* Enable VBUS supply */
+        if (phy_drd->vbus_boost) {
+                ret = regulator_enable(phy_drd->vbus_boost);
+                if (ret) {
+                        dev_err(phy_drd->dev,
+                                "Failed to enable VBUS boost supply\n");
+                        goto fail_vbus;
+                }
+        }
+
         if (phy_drd->vbus) {
                 ret = regulator_enable(phy_drd->vbus);
                 if (ret) {
                         dev_err(phy_drd->dev, "Failed to enable VBUS supply\n");
-                        goto fail_vbus;
+                        goto fail_vbus_boost;
                 }
         }
 
@@ -473,6 +485,10 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)
 
         return 0;
 
+fail_vbus_boost:
+        if (phy_drd->vbus_boost)
+                regulator_disable(phy_drd->vbus_boost);
+
 fail_vbus:
         clk_disable_unprepare(phy_drd->ref_clk);
         if (!phy_drd->drv_data->has_common_clk_gate) {
@@ -497,6 +513,8 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy)
         /* Disable VBUS supply */
         if (phy_drd->vbus)
                 regulator_disable(phy_drd->vbus);
+        if (phy_drd->vbus_boost)
+                regulator_disable(phy_drd->vbus_boost);
 
         clk_disable_unprepare(phy_drd->ref_clk);
         if (!phy_drd->drv_data->has_common_clk_gate) {
@@ -690,7 +708,7 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
                 break;
         }
 
-        /* Get Vbus regulator */
+        /* Get Vbus regulators */
         phy_drd->vbus = devm_regulator_get(dev, "vbus");
         if (IS_ERR(phy_drd->vbus)) {
                 ret = PTR_ERR(phy_drd->vbus);
@@ -701,6 +719,16 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
                 phy_drd->vbus = NULL;
         }
 
+        phy_drd->vbus_boost = devm_regulator_get(dev, "vbus-boost");
+        if (IS_ERR(phy_drd->vbus_boost)) {
+                ret = PTR_ERR(phy_drd->vbus_boost);
+                if (ret == -EPROBE_DEFER)
+                        return ret;
+
+                dev_warn(dev, "Failed to get VBUS boost supply regulator\n");
+                phy_drd->vbus_boost = NULL;
+        }
+
         dev_vdbg(dev, "Creating usbdrd_phy phy\n");
 
         for (i = 0; i < EXYNOS5_DRDPHYS_NUM; i++) {