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Subject[PATCH v5 2/2] phy: exynos5-usbdrd: Add facility for VBUS supply
Date
Adding support to enable/disable VBUS controlled by a
regulator, to enable vbus supply on the port.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
---

This is v2 version of patch:
[PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio on/off
https://lkml.org/lkml/2014/4/9/186

Changes from v1:
- Using regulator APIs instead of gpio to control VBUS.

drivers/phy/phy-exynos5-usbdrd.c | 36 +++++++++++++++++++++++++++++++++++-
1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
index 89d7ae8..d7e3745 100644
--- a/drivers/phy/phy-exynos5-usbdrd.c
+++ b/drivers/phy/phy-exynos5-usbdrd.c
@@ -23,6 +23,7 @@
#include <linux/mutex.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>

/* Exynos USB PHY registers */
#define EXYNOS5_FSEL_9MHZ6 0x0
@@ -172,6 +173,7 @@ struct exynos5_usbdrd_phy {
unsigned int extrefclk;
struct clk *ref_clk;
unsigned long ref_rate;
+ struct regulator *vbus;
};

#define to_usbdrd_phy(inst) \
@@ -442,6 +444,7 @@ static int exynos5_usbdrd_phy_exit(struct phy *phy)

static int exynos5_usbdrd_phy_power_on(struct phy *phy)
{
+ int ret;
struct phy_usb_instance *inst = phy_get_drvdata(phy);
struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);

@@ -449,10 +452,26 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)

clk_prepare_enable(phy_drd->ref_clk);

+ /* Enable VBUS supply */
+ 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;
+ }
+ }
+
/* Power-on PHY*/
inst->phy_cfg->phy_isol(inst, 0);

return 0;
+
+fail_vbus:
+ clk_disable_unprepare(phy_drd->ref_clk);
+ if (!IS_ERR(phy_drd->usb30_sclk))
+ clk_disable_unprepare(phy_drd->usb30_sclk);
+
+ return ret;
}

static int exynos5_usbdrd_phy_power_off(struct phy *phy)
@@ -465,6 +484,10 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy)
/* Power-off the PHY */
inst->phy_cfg->phy_isol(inst, 1);

+ /* Disable VBUS supply */
+ if (phy_drd->vbus)
+ regulator_disable(phy_drd->vbus);
+
clk_disable_unprepare(phy_drd->ref_clk);

return 0;
@@ -537,7 +560,7 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
const struct exynos5_usbdrd_phy_drvdata *drv_data;
struct regmap *reg_pmu;
u32 pmu_offset;
- int i;
+ int i, ret;

phy_drd = devm_kzalloc(dev, sizeof(*phy_drd), GFP_KERNEL);
if (!phy_drd)
@@ -580,6 +603,17 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
return PTR_ERR(reg_pmu);
}

+ /* Get required GPIO for vbus */
+ phy_drd->vbus = devm_regulator_get(dev, "vbus");
+ if (IS_ERR(phy_drd->vbus)) {
+ ret = PTR_ERR(phy_drd->vbus);
+ if (ret == -EPROBE_DEFER)
+ return ret;
+
+ dev_warn(dev, "Failed to get VBUS supply regulator\n");
+ phy_drd->vbus = NULL;
+ }
+
if (of_property_read_u32(node, "samsung,pmu-offset", &pmu_offset)) {
dev_err(dev, "Missing pmu-offset for phy isolation\n");
return -EINVAL;
--
1.7.10.4


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