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phy: exynos5-usbdrd: Add facility for VBUS supply 

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>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Vivek Gautam 2014-05-13 15:30:17 +05:30 committed by Kishon Vijay Abraham I
parent 59025887fb
commit 4fc8a4e65f
1 changed files with 32 additions and 0 deletions
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32
drivers/phy/phy-exynos5-usbdrd.c
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@ -24,6 +24,7 @@
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/exynos5-pmu.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
/* Exynos USB PHY registers */
#define EXYNOS5_FSEL_9MHZ6 0x0
@ -170,6 +171,7 @@ struct exynos5_usbdrd_phy {
} phys[EXYNOS5_DRDPHYS_NUM];
u32 extrefclk;
struct clk *ref_clk;
struct regulator *vbus;
};
static inline
@ -438,6 +440,7 @@ 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);
@ -445,10 +448,24 @@ 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);
return ret;
}
static int exynos5_usbdrd_phy_power_off(struct phy *phy)
@ -461,6 +478,10 @@ 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;
@ -600,6 +621,17 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
break;
}
/* Get Vbus regulator */
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;
}
dev_vdbg(dev, "Creating usbdrd_phy phy\n");
for (i = 0; i < EXYNOS5_DRDPHYS_NUM; i++) {