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Subject[PATCH 06/11] phy: exynos5-usbdrd: Add facility for VBUS-BOOST-5V supply
Date
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>
---
drivers/phy/phy-exynos5-usbdrd.c | 32 ++++++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
index 3654712..1f54639 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++) {
--
1.7.10.4


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