Adding support to enable/disable VBUS controlled by a regulator, to enable vbus supply on the port.
Signed-off-by: Vivek Gautam <gautam.vi...@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 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
