pinctrl: single: adopt pinctrl sleep mode management

Make pinctrl-single able to handle suspend/resume events and change
hogged pins states accordingly.
Signed-off-by: Hebbar Gururaja <gururaja.hebbar@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-single.c

@@ -1483,6 +1483,29 @@ static int pcs_add_gpio_func(struct device_node *node, struct pcs_device *pcs)
 	return ret;
 }
 
+static int pinctrl_single_suspend(struct platform_device *pdev,
+					pm_message_t state)
+{
+	struct pcs_device *pcs;
+
+	pcs = platform_get_drvdata(pdev);
+	if (!pcs)
+		return -EINVAL;
+
+	return pinctrl_force_sleep(pcs->pctl);
+}
+
+static int pinctrl_single_resume(struct platform_device *pdev)
+{
+	struct pcs_device *pcs;
+
+	pcs = platform_get_drvdata(pdev);
+	if (!pcs)
+		return -EINVAL;
+
+	return pinctrl_force_default(pcs->pctl);
+}
+
 static int pcs_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -1631,6 +1654,10 @@ static struct platform_driver pcs_driver = {
 		.name		= DRIVER_NAME,
 		.of_match_table	= pcs_of_match,
 	},
+#ifdef CONFIG_PM
+	.suspend = pinctrl_single_suspend,
+	.resume = pinctrl_single_resume,
+#endif
 };
 
 module_platform_driver(pcs_driver);