usb: chipidea: imx: add system power management support

Add basic system power management support

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 8b1482aa1291..75421c2187f5 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -208,6 +208,41 @@ static int ci_hdrc_imx_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int imx_controller_suspend(struct device *dev)
+{
+        struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+
+        dev_dbg(dev, "at %s\n", __func__);
+
+        clk_disable_unprepare(data->clk);
+
+        return 0;
+}
+
+static int imx_controller_resume(struct device *dev)
+{
+        struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+
+        dev_dbg(dev, "at %s\n", __func__);
+
+        return clk_prepare_enable(data->clk);
+}
+
+static int ci_hdrc_imx_suspend(struct device *dev)
+{
+        return imx_controller_suspend(dev);
+}
+
+static int ci_hdrc_imx_resume(struct device *dev)
+{
+        return imx_controller_resume(dev);
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops ci_hdrc_imx_pm_ops = {
+        SET_SYSTEM_SLEEP_PM_OPS(ci_hdrc_imx_suspend, ci_hdrc_imx_resume)
+};
 static struct platform_driver ci_hdrc_imx_driver = {
         .probe = ci_hdrc_imx_probe,
         .remove = ci_hdrc_imx_remove,
@@ -215,6 +250,7 @@ static struct platform_driver ci_hdrc_imx_driver = {
                 .name = "imx_usb",
                 .owner = THIS_MODULE,
                 .of_match_table = ci_hdrc_imx_dt_ids,
+                .pm = &ci_hdrc_imx_pm_ops,
          },
 };