usb: misc: usb3503: Add system sleep support in non-I2C mode

USB3503 chip can be used without any I2C connection, what is handled by
a simple platform device driver. Add support for resetting the chip (via
GPIO lines) during system suspend/resume cycle by adding calls to existing
suspend/resume functions used for E2C device.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/usb3503.c

@@ -355,11 +355,8 @@ static int usb3503_platform_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
-static int usb3503_i2c_suspend(struct device *dev)
+static int usb3503_suspend(struct usb3503 *hub)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct usb3503 *hub = i2c_get_clientdata(client);
-
 	usb3503_switch_mode(hub, USB3503_MODE_STANDBY);
 
 	if (hub->clk)
@@ -368,11 +365,8 @@ static int usb3503_i2c_suspend(struct device *dev)
 	return 0;
 }
 
-static int usb3503_i2c_resume(struct device *dev)
+static int usb3503_resume(struct usb3503 *hub)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct usb3503 *hub = i2c_get_clientdata(client);
-
 	if (hub->clk)
 		clk_prepare_enable(hub->clk);
 
@@ -380,11 +374,38 @@ static int usb3503_i2c_resume(struct device *dev)
 
 	return 0;
 }
+
+static int usb3503_i2c_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return usb3503_suspend(i2c_get_clientdata(client));
+}
+
+static int usb3503_i2c_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return usb3503_resume(i2c_get_clientdata(client));
+}
+
+static int usb3503_platform_suspend(struct device *dev)
+{
+	return usb3503_suspend(dev_get_drvdata(dev));
+}
+
+static int usb3503_platform_resume(struct device *dev)
+{
+	return usb3503_resume(dev_get_drvdata(dev));
+}
 #endif
 
 static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
 		usb3503_i2c_resume);
 
+static SIMPLE_DEV_PM_OPS(usb3503_platform_pm_ops, usb3503_platform_suspend,
+		usb3503_platform_resume);
+
 static const struct i2c_device_id usb3503_id[] = {
 	{ USB3503_I2C_NAME, 0 },
 	{ }
@@ -415,6 +436,7 @@ static struct platform_driver usb3503_platform_driver = {
 	.driver = {
 		.name = USB3503_I2C_NAME,
 		.of_match_table = of_match_ptr(usb3503_of_match),
+		.pm = &usb3503_platform_pm_ops,
 	},
 	.probe		= usb3503_platform_probe,
 	.remove		= usb3503_platform_remove,