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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>
This commit is contained in:
Vivek Gautam 2014-11-21 19:05:46 +05:30 committed by Felipe Balbi
parent c1a3acaadd
commit 72d996fc7a
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/dwc3/dwc3-exynos.c
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@ -34,6 +34,8 @@ struct dwc3_exynos {
struct device *dev; struct device *dev;
struct clk *clk; struct clk *clk;
struct clk *susp_clk;
struct regulator *vdd33; struct regulator *vdd33;
struct regulator *vdd10; struct regulator *vdd10;
}; };
@ -140,6 +142,13 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
} }
clk_prepare_enable(exynos->clk); 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"); exynos->vdd33 = devm_regulator_get(dev, "vdd33");
if (IS_ERR(exynos->vdd33)) { if (IS_ERR(exynos->vdd33)) {
ret = PTR_ERR(exynos->vdd33); ret = PTR_ERR(exynos->vdd33);
@ -181,6 +190,7 @@ err4:
err3: err3:
regulator_disable(exynos->vdd33); regulator_disable(exynos->vdd33);
err2: err2:
clk_disable_unprepare(exynos->susp_clk);
clk_disable_unprepare(exynos->clk); clk_disable_unprepare(exynos->clk);
return ret; return ret;
} }
@ -193,6 +203,7 @@ static int dwc3_exynos_remove(struct platform_device *pdev)
platform_device_unregister(exynos->usb2_phy); platform_device_unregister(exynos->usb2_phy);
platform_device_unregister(exynos->usb3_phy); platform_device_unregister(exynos->usb3_phy);
clk_disable_unprepare(exynos->susp_clk);
clk_disable_unprepare(exynos->clk); clk_disable_unprepare(exynos->clk);
regulator_disable(exynos->vdd33); regulator_disable(exynos->vdd33);