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Subject[PATCH 03/11] dwc3: exynos: Add provision for suspend clock
Date
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@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.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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