PM: Run-time PM platform device bus support

This patch adds default Runtime PM callbacks to the dev_pm_ops
belonging to the platform bus. The callbacks are weak symbols
that architecture specific code can override.

Allows Runtime PM even though CONFIG_PM_SLEEP=n.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 37 insertions, 9 deletions

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index d28c289e4a3f..0f7d434ce983 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -17,6 +17,7 @@
 #include <linux/bootmem.h>
 #include <linux/err.h>
 #include <linux/slab.h>
+#include <linux/pm_runtime.h>
 
 #include "base.h"
 
@@ -656,6 +657,13 @@ static void platform_pm_complete(struct device *dev)
                 drv->pm->complete(dev);
 }
 
+#else /* !CONFIG_PM_SLEEP */
+
+#define platform_pm_prepare             NULL
+#define platform_pm_complete            NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
 #ifdef CONFIG_SUSPEND
 
 static int platform_pm_suspend(struct device *dev)
@@ -886,6 +894,31 @@ static int platform_pm_restore_noirq(struct device *dev)
 
 #endif /* !CONFIG_HIBERNATION */
 
+#ifdef CONFIG_PM_RUNTIME
+
+int __weak platform_pm_runtime_suspend(struct device *dev)
+{
+        return -ENOSYS;
+};
+
+int __weak platform_pm_runtime_resume(struct device *dev)
+{
+        return -ENOSYS;
+};
+
+int __weak platform_pm_runtime_idle(struct device *dev)
+{
+        return -ENOSYS;
+};
+
+#else /* !CONFIG_PM_RUNTIME */
+
+#define platform_pm_runtime_suspend NULL
+#define platform_pm_runtime_resume NULL
+#define platform_pm_runtime_idle NULL
+
+#endif /* !CONFIG_PM_RUNTIME */
+
 static const struct dev_pm_ops platform_dev_pm_ops = {
         .prepare = platform_pm_prepare,
         .complete = platform_pm_complete,
@@ -901,22 +934,17 @@ static const struct dev_pm_ops platform_dev_pm_ops = {
         .thaw_noirq = platform_pm_thaw_noirq,
         .poweroff_noirq = platform_pm_poweroff_noirq,
         .restore_noirq = platform_pm_restore_noirq,
+        .runtime_suspend = platform_pm_runtime_suspend,
+        .runtime_resume = platform_pm_runtime_resume,
+        .runtime_idle = platform_pm_runtime_idle,
 };
 
-#define PLATFORM_PM_OPS_PTR     (&platform_dev_pm_ops)
-
-#else /* !CONFIG_PM_SLEEP */
-
-#define PLATFORM_PM_OPS_PTR     NULL
-
-#endif /* !CONFIG_PM_SLEEP */
-
 struct bus_type platform_bus_type = {
         .name           = "platform",
         .dev_attrs      = platform_dev_attrs,
         .match          = platform_match,
         .uevent         = platform_uevent,
-        .pm             = PLATFORM_PM_OPS_PTR,
+        .pm             = &platform_dev_pm_ops,
 };
 EXPORT_SYMBOL_GPL(platform_bus_type);