sh: MTU2: Basic runtime PM support

Modify the SH MTU2 clock event device driver to support runtime PM at
a basic level (i.e. device clocks can be disabled and enabled, but
domain power must be on, because the device has to be marked as
"irq safe").

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>

1 files changed, 23 insertions, 6 deletions

diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 1a95cad96819..c5eea858054a 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -32,6 +32,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
 
 struct sh_mtu2_priv {
         void __iomem *mapbase;
@@ -123,6 +124,9 @@ static int sh_mtu2_enable(struct sh_mtu2_priv *p)
 {
         int ret;
 
+        pm_runtime_get_sync(&p->pdev->dev);
+        dev_pm_syscore_device(&p->pdev->dev, true);
+
         /* enable clock */
         ret = clk_enable(p->clk);
         if (ret) {
@@ -157,6 +161,9 @@ static void sh_mtu2_disable(struct sh_mtu2_priv *p)
 
         /* stop clock */
         clk_disable(p->clk);
+
+        dev_pm_syscore_device(&p->pdev->dev, false);
+        pm_runtime_put(&p->pdev->dev);
 }
 
 static irqreturn_t sh_mtu2_interrupt(int irq, void *dev_id)
@@ -317,18 +324,17 @@ static int sh_mtu2_setup(struct sh_mtu2_priv *p, struct platform_device *pdev)
 static int __devinit sh_mtu2_probe(struct platform_device *pdev)
 {
         struct sh_mtu2_priv *p = platform_get_drvdata(pdev);
+        struct sh_timer_config *cfg = pdev->dev.platform_data;
         int ret;
 
         if (!is_early_platform_device(pdev)) {
-                struct sh_timer_config *cfg = pdev->dev.platform_data;
-
-                if (cfg->clockevent_rating)
-                        dev_pm_syscore_device(&pdev->dev, true);
+                pm_runtime_set_active(&pdev->dev);
+                pm_runtime_enable(&pdev->dev);
         }
 
         if (p) {
                 dev_info(&pdev->dev, "kept as earlytimer\n");
-                return 0;
+                goto out;
         }
 
         p = kmalloc(sizeof(*p), GFP_KERNEL);
@@ -341,8 +347,19 @@ static int __devinit sh_mtu2_probe(struct platform_device *pdev)
         if (ret) {
                 kfree(p);
                 platform_set_drvdata(pdev, NULL);
+                pm_runtime_idle(&pdev->dev);
+                return ret;
         }
-        return ret;
+        if (is_early_platform_device(pdev))
+                return 0;
+
+ out:
+        if (cfg->clockevent_rating)
+                pm_runtime_irq_safe(&pdev->dev);
+        else
+                pm_runtime_idle(&pdev->dev);
+
+        return 0;
 }
 
 static int __devexit sh_mtu2_remove(struct platform_device *pdev)