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usb: dwc3: exynos: add basic suspend/resume support 

Adds suspend and resume callbacks to exynos dwc3 driver as part of
power management support.

This change does gating of dwc3 clock during suspend/resume cycles.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Vikas C Sajjan <vikas.sajjan@linaro.org>
CC: Doug Anderson <dianders@chromium.org>
Tested-by: Vivek Gautam <gautam.vivek@samsung.com>

[ balbi@ti.com : refreshed to current linus/master ]

Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Vikas Sajjan 2012-10-16 15:15:38 +05:30 committed by Felipe Balbi
parent f3e117f443
commit 0646caf754
1 changed files with 34 additions and 0 deletions
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34
drivers/usb/dwc3/dwc3-exynos.c
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@ -187,12 +187,46 @@ static const struct of_device_id exynos_dwc3_match[] = {
MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
#endif
#ifdef CONFIG_PM
static int dwc3_exynos_suspend(struct device *dev)
{
struct dwc3_exynos *exynos = dev_get_drvdata(dev);
clk_disable(exynos->clk);
return 0;
}
static int dwc3_exynos_resume(struct device *dev)
{
struct dwc3_exynos *exynos = dev_get_drvdata(dev);
clk_enable(exynos->clk);
/* runtime set active to reflect active state. */
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
}
static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
};
#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
#else
#define DEV_PM_OPS NULL
#endif /* CONFIG_PM */
static struct platform_driver dwc3_exynos_driver = {
.probe = dwc3_exynos_probe,
.remove = dwc3_exynos_remove,
.driver = {
.name = "exynos-dwc3",
.of_match_table = of_match_ptr(exynos_dwc3_match),
.pm = DEV_PM_OPS,
},
};