[PATCH 3/7] gpio: rcar: Add minimal runtime PM support

From: Geert Uytterhoeven <geert+renesas@glider.be>

This is just enough to automatically enable the functional clock, if
present. Clock management during suspend/resume is still to be added.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Linus Walleij <redacted>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: <redacted>
---
 drivers/gpio/gpio-rcar.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 03c91482432c..c6995f6c3c40 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c

@@ -26,6 +26,7 @@
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_data/gpio-rcar.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>

@@ -377,6 +378,9 @@ static int gpio_rcar_probe(struct platform_device *pdev)

 	platform_set_drvdata(pdev, p);

+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
 	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

@@ -460,6 +464,8 @@ static int gpio_rcar_probe(struct platform_device *pdev)

err1:
 	irq_domain_remove(p->irq_domain);
 err0:
+	pm_runtime_put_sync(dev);

+	pm_runtime_disable(dev);
 	return ret;
 }

@@ -473,6 +479,8 @@ static int gpio_rcar_remove(struct platform_device

*pdev) return ret;

 	irq_domain_remove(p->irq_domain);
+	pm_runtime_put_sync(&pdev->dev);

+	pm_runtime_disable(&pdev->dev);
 	return 0;
 }