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>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index b082bec7343e..e12e45248862 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -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,
         },
 };