linux-kernel - [PATCH 03/11] dwc3: exynos: Add provision for suspend clock

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Date:	Fri, 21 Nov 2014 19:05:46 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	balbi@...com, kishon@...com
Cc:	linux-omap@...r.kernel.org, gregkh@...uxfoundation.org,
	tomasz.figa@...il.com, s.nawrocki@...sung.com, robh+dt@...nel.org,
	stern@...land.harvard.edu, kgene.kim@...sung.com,
	Vivek Gautam <gautam.vivek@...sung.com>
Subject: [PATCH 03/11] dwc3: exynos: Add provision for suspend clock

DWC3 controller on Exynos SoC series have separate control for
suspend clock which replaces pipe3_rx_pclk as clock source to
a small part of DWC3 core that operates when SS PHY is in its
lowest power state (P3) in states SS.disabled and U3.

Suggested-by: Anton Tikhomirov <av.tikhomirov@...sung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
---
 drivers/usb/dwc3/dwc3-exynos.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index 7109de7..af15ab3 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -35,6 +35,8 @@ struct dwc3_exynos {
 	struct device		*dev;
 
 	struct clk		*clk;
+	struct clk		*susp_clk;
+
 	struct regulator	*vdd33;
 	struct regulator	*vdd10;
 };
@@ -141,6 +143,13 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 	}
 	clk_prepare_enable(exynos->clk);
 
+	exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
+	if (IS_ERR(exynos->susp_clk)) {
+		dev_dbg(dev, "no suspend clk specified\n");
+		exynos->susp_clk = NULL;
+	}
+	clk_prepare_enable(exynos->susp_clk);
+
 	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 	if (IS_ERR(exynos->vdd33)) {
 		ret = PTR_ERR(exynos->vdd33);
@@ -182,6 +191,7 @@ err4:
 err3:
 	regulator_disable(exynos->vdd33);
 err2:
+	clk_disable_unprepare(exynos->susp_clk);
 	clk_disable_unprepare(exynos->clk);
 	return ret;
 }
@@ -194,6 +204,7 @@ static int dwc3_exynos_remove(struct platform_device *pdev)
 	platform_device_unregister(exynos->usb2_phy);
 	platform_device_unregister(exynos->usb3_phy);
 
+	clk_disable_unprepare(exynos->susp_clk);
 	clk_disable_unprepare(exynos->clk);
 
 	regulator_disable(exynos->vdd33);
-- 
1.7.10.4

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