PM / Domains: Move code from under #ifdef CONFIG_PM_RUNTIME (v2)

There is some code in drivers/base/power/domain.c that will be useful
for both runtime PM and system-wide power transitions, so make it
depend on CONFIG_PM instead of CONFIG_PM_RUNTIME.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Kevin Hilman <khilman@ti.com>

drivers/base/power/domain.c

@@ -14,7 +14,15 @@
 #include <linux/slab.h>
 #include <linux/err.h>
 
-#ifdef CONFIG_PM_RUNTIME
+#ifdef CONFIG_PM
+
+static struct generic_pm_domain *dev_to_genpd(struct device *dev)
+{
+	if (IS_ERR_OR_NULL(dev->pm_domain))
+		return ERR_PTR(-EINVAL);
+
+	return container_of(dev->pm_domain, struct generic_pm_domain, domain);
+}
 
 static void genpd_sd_counter_dec(struct generic_pm_domain *genpd)
 {
@@ -22,6 +30,58 @@ static void genpd_sd_counter_dec(struct generic_pm_domain *genpd)
 			genpd->sd_count--;
 }
 
+/**
+ * pm_genpd_poweron - Restore power to a given PM domain and its parents.
+ * @genpd: PM domain to power up.
+ *
+ * Restore power to @genpd and all of its parents so that it is possible to
+ * resume a device belonging to it.
+ */
+static int pm_genpd_poweron(struct generic_pm_domain *genpd)
+{
+	int ret = 0;
+
+ start:
+	if (genpd->parent)
+		mutex_lock(&genpd->parent->lock);
+	mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
+
+	if (!genpd->power_is_off)
+		goto out;
+
+	if (genpd->parent && genpd->parent->power_is_off) {
+		mutex_unlock(&genpd->lock);
+		mutex_unlock(&genpd->parent->lock);
+
+		ret = pm_genpd_poweron(genpd->parent);
+		if (ret)
+			return ret;
+
+		goto start;
+	}
+
+	if (genpd->power_on) {
+		int ret = genpd->power_on(genpd);
+		if (ret)
+			goto out;
+	}
+
+	genpd->power_is_off = false;
+	if (genpd->parent)
+		genpd->parent->sd_count++;
+
+ out:
+	mutex_unlock(&genpd->lock);
+	if (genpd->parent)
+		mutex_unlock(&genpd->parent->lock);
+
+	return ret;
+}
+
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_PM_RUNTIME
+
 /**
  * __pm_genpd_save_device - Save the pre-suspend state of a device.
  * @dle: Device list entry of the device to save the state of.
@@ -174,11 +234,10 @@ static int pm_genpd_runtime_suspend(struct device *dev)
 
 	dev_dbg(dev, "%s()\n", __func__);
 
-	if (IS_ERR_OR_NULL(dev->pm_domain))
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
 		return -EINVAL;
 
-	genpd = container_of(dev->pm_domain, struct generic_pm_domain, domain);
-
 	if (genpd->parent)
 		mutex_lock(&genpd->parent->lock);
 	mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
@@ -200,54 +259,6 @@ static int pm_genpd_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-/**
- * pm_genpd_poweron - Restore power to a given PM domain and its parents.
- * @genpd: PM domain to power up.
- *
- * Restore power to @genpd and all of its parents so that it is possible to
- * resume a device belonging to it.
- */
-static int pm_genpd_poweron(struct generic_pm_domain *genpd)
-{
-	int ret = 0;
-
- start:
-	if (genpd->parent)
-		mutex_lock(&genpd->parent->lock);
-	mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
-
-	if (!genpd->power_is_off)
-		goto out;
-
-	if (genpd->parent && genpd->parent->power_is_off) {
-		mutex_unlock(&genpd->lock);
-		mutex_unlock(&genpd->parent->lock);
-
-		ret = pm_genpd_poweron(genpd->parent);
-		if (ret)
-			return ret;
-
-		goto start;
-	}
-
-	if (genpd->power_on) {
-		int ret = genpd->power_on(genpd);
-		if (ret)
-			goto out;
-	}
-
-	genpd->power_is_off = false;
-	if (genpd->parent)
-		genpd->parent->sd_count++;
-
- out:
-	mutex_unlock(&genpd->lock);
-	if (genpd->parent)
-		mutex_unlock(&genpd->parent->lock);
-
-	return ret;
-}
-
 /**
  * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
  * @dev: Device to resume.
@@ -264,11 +275,10 @@ static int pm_genpd_runtime_resume(struct device *dev)
 
 	dev_dbg(dev, "%s()\n", __func__);
 
-	if (IS_ERR_OR_NULL(dev->pm_domain))
+	genpd = dev_to_genpd(dev);
+	if (IS_ERR(genpd))
 		return -EINVAL;
 
-	genpd = container_of(dev->pm_domain, struct generic_pm_domain, domain);
-
 	ret = pm_genpd_poweron(genpd);
 	if (ret)
 		return ret;