usb: 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@samsung.com>
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index 14f85a0..a1782d8 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -34,6 +34,8 @@
struct device *dev;
struct clk *clk;
+ struct clk *susp_clk;
+
struct regulator *vdd33;
struct regulator *vdd10;
};
@@ -140,6 +142,13 @@
}
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);
@@ -181,6 +190,7 @@
err3:
regulator_disable(exynos->vdd33);
err2:
+ clk_disable_unprepare(exynos->susp_clk);
clk_disable_unprepare(exynos->clk);
return ret;
}
@@ -193,6 +203,7 @@
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);