[PATCH v2 3/4] phy: exynos5-usbdrd: Add facility for VBUS-BOOST-5V supply

[Vivek Gautam]

Some Exynos SoCs 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.vi...@samsung.com>
---
 drivers/phy/phy-exynos5-usbdrd.c |   30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
index 013ee84..57e8a0a 100644
--- a/drivers/phy/phy-exynos5-usbdrd.c
+++ b/drivers/phy/phy-exynos5-usbdrd.c
@@ -176,6 +176,7 @@ struct exynos5_usbdrd_phy {
        u32 extrefclk;
        struct clk *ref_clk;
        struct regulator *vbus;
+       struct regulator *vbus_boost;
 };
 
 static inline
@@ -455,11 +456,20 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)
        clk_prepare_enable(phy_drd->ref_clk);
 
        /* 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;
                }
        }
 
@@ -468,6 +478,10 @@ 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);
        clk_disable_unprepare(phy_drd->pipeclk);
@@ -489,6 +503,8 @@ 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);
        clk_disable_unprepare(phy_drd->pipeclk);
@@ -644,7 +660,7 @@ 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);
@@ -655,6 +671,16 @@ 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++) {
-- 
1.7.10.4

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