[PATCH v3 2/3] drivers: sh: pm_runtime implementation needs to suspend and resume devices

[Geert Uytterhoeven <geert+renesas@glider.be>]

From: Ben Dooks <ben.dooks@codethink.co.uk>

If we override the platform bus calls for pm_runtime then we end up
with the calls to the devices' suspend and resume methods ignored
in favour of the bus ones.

Change to calling the pm_runtime calls to suspend and resume the
devices specifically in the drivers/sh/pm_runtime.c implementation
to allow any device that may want to run power management to do so.

Note, all the current sh driver implementations do not use their
own power management code so this is not a major implementation
issues.

This also brings the implementation into line with the versions
used by the Davinci and Keystone PM domain code, so once fully
tested these implementations could be merged together.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
v3:
  - Add Reviewed-by
v2:
  - New
---
 drivers/sh/pm_runtime.c |   37 +++++++++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/drivers/sh/pm_runtime.c b/drivers/sh/pm_runtime.c
index 00b82ec94442..25eafbe4da33 100644
--- a/drivers/sh/pm_runtime.c
+++ b/drivers/sh/pm_runtime.c
@@ -21,10 +21,43 @@
 #include <linux/slab.h>
 
 #ifdef CONFIG_PM_RUNTIME
+static int sh_pm_runtime_suspend(struct device *dev)
+{
+	int ret;
+
+	ret = pm_generic_runtime_suspend(dev);
+	if (ret) {
+		dev_err(dev, "failed to suspend device\n");
+		return ret;
+	}
+
+	ret = pm_clk_suspend(dev);
+	if (ret) {
+		dev_err(dev, "failed to suspend clock\n");
+		pm_generic_runtime_resume(dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sh_pm_runtime_resume(struct device *dev)
+{
+	int ret;
+
+	ret = pm_clk_resume(dev);
+	if (ret) {
+		dev_err(dev, "failed to resume clock\n");
+		return ret;
+	}
+
+	return pm_generic_runtime_resume(dev);
+}
+
 static struct dev_pm_domain default_pm_domain = {
 	.ops = {
-		.runtime_suspend = pm_clk_suspend,
-		.runtime_resume = pm_clk_resume,
+		.runtime_suspend = sh_pm_runtime_suspend,
+		.runtime_resume = sh_pm_runtime_resume,
 		USE_PLATFORM_PM_SLEEP_OPS
 	},
 };
-- 
1.7.9.5