linux-kernel - [PATCH 2/5] phy: exynos5-usbdrd: Add pipe-clk and utmi-clk support

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Message-Id: <1409212920-28526-3-git-send-email-gautam.vivek@samsung.com>
Date:	Thu, 28 Aug 2014 13:31:57 +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 2/5] phy: exynos5-usbdrd: Add pipe-clk and utmi-clk support

Exynos7 SoC has now separate gate control for 125MHz pipe3 phy
clock, as well as 60MHz utmi phy clock.
So get the same and control in the phy-exynos5-usbdrd driver.

Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
---
 .../devicetree/bindings/phy/samsung-phy.txt        |    4 ++++
 drivers/phy/phy-exynos5-usbdrd.c                   |   24 ++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
index 7a6feea..b64d616 100644
--- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
+++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
@@ -135,6 +135,10 @@ Required properties:
 	       PHY operations, associated by phy name. It is used to
 	       determine bit values for clock settings register.
 	       For Exynos5420 this is given as 'sclk_usbphy30' in CMU.
+	- optional clocks: Next gen Exynos SoCs have following additional
+			   gate clocks available:
+			   - phy_pipe: for PIPE3 phy
+			   - phy_utmi: for UTMI+ phy
 - samsung,pmu-syscon: phandle for PMU system controller interface, used to
 		      control pmu registers for power isolation.
 - #phy-cells : from the generic PHY bindings, must be 1;
diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
index b05302b..685c108 100644
--- a/drivers/phy/phy-exynos5-usbdrd.c
+++ b/drivers/phy/phy-exynos5-usbdrd.c
@@ -148,6 +148,8 @@ struct exynos5_usbdrd_phy_drvdata {
  * @dev: pointer to device instance of this platform device
  * @reg_phy: usb phy controller register memory base
  * @clk: phy clock for register access
+ * @pipeclk: clock for pipe3 phy
+ * @utmiclk: clock for utmi+ phy
  * @drv_data: pointer to SoC level driver data structure
  * @phys[]: array for 'EXYNOS5_DRDPHYS_NUM' number of PHY
  *	    instances each with its 'phy' and 'phy_cfg'.
@@ -161,6 +163,8 @@ struct exynos5_usbdrd_phy {
 	struct device *dev;
 	void __iomem *reg_phy;
 	struct clk *clk;
+	struct clk *pipeclk;
+	struct clk *utmiclk;
 	const struct exynos5_usbdrd_phy_drvdata *drv_data;
 	struct phy_usb_instance {
 		struct phy *phy;
@@ -446,6 +450,10 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)
 
 	dev_dbg(phy_drd->dev, "Request to power_on usbdrd_phy phy\n");
 
+	if (!IS_ERR(phy_drd->utmiclk))
+		clk_prepare_enable(phy_drd->utmiclk);
+	if (!IS_ERR(phy_drd->pipeclk))
+		clk_prepare_enable(phy_drd->pipeclk);
 	clk_prepare_enable(phy_drd->ref_clk);
 
 	/* Enable VBUS supply */
@@ -464,6 +472,10 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy)
 
 fail_vbus:
 	clk_disable_unprepare(phy_drd->ref_clk);
+	if (!IS_ERR(phy_drd->pipeclk))
+		clk_disable_unprepare(phy_drd->pipeclk);
+	if (!IS_ERR(phy_drd->utmiclk))
+		clk_disable_unprepare(phy_drd->utmiclk);
 
 	return ret;
 }
@@ -483,6 +495,10 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy)
 		regulator_disable(phy_drd->vbus);
 
 	clk_disable_unprepare(phy_drd->ref_clk);
+	if (!IS_ERR(phy_drd->pipeclk))
+		clk_disable_unprepare(phy_drd->pipeclk);
+	if (!IS_ERR(phy_drd->utmiclk))
+		clk_disable_unprepare(phy_drd->utmiclk);
 
 	return 0;
 }
@@ -581,6 +597,14 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
 		return PTR_ERR(phy_drd->clk);
 	}
 
+	phy_drd->pipeclk = devm_clk_get(dev, "phy_pipe");
+	if (IS_ERR(phy_drd->pipeclk))
+		dev_warn(dev, "Failed to get pipe3 phy operational clock\n");
+
+	phy_drd->utmiclk = devm_clk_get(dev, "phy_utmi");
+	if (IS_ERR(phy_drd->utmiclk))
+		dev_warn(dev, "Failed to get utmi phy operational clock\n");
+
 	phy_drd->ref_clk = devm_clk_get(dev, "ref");
 	if (IS_ERR(phy_drd->ref_clk)) {
 		dev_err(dev, "Failed to get reference clock of usbdrd phy\n");
-- 
1.7.10.4

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