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

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Message-Id: <1409212920-28526-4-git-send-email-gautam.vivek@samsung.com>
Date:	Thu, 28 Aug 2014 13:31:58 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	linux-usb@...r.kernel.org
Cc:	devicetree@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-omap@...r.kernel.org, gregkh@...uxfoundation.org,
	balbi@...com, kishon@...com, kgene.kim@...sung.com,
	Vivek Gautam <gautam.vivek@...sung.com>
Subject: [PATCH 3/5] phy: exynos5-usbdrd: Add facility for VBUS-BOOST-5V supply

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.vivek@...sung.com>
---
 drivers/phy/phy-exynos5-usbdrd.c |   27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
index 685c108..a6d0cb7 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
@@ -457,11 +458,19 @@ 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;
 		}
 	}
 
@@ -470,6 +479,9 @@ 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 (!IS_ERR(phy_drd->pipeclk))
@@ -493,6 +505,8 @@ 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 (!IS_ERR(phy_drd->pipeclk))
@@ -645,7 +659,7 @@ 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 +669,15 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
 		dev_warn(dev, "Failed to get VBUS supply regulator\n");
 		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");
 
-- 
1.7.10.4

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