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>
diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 1a95cad..c5eea85 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 @@
{
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 @@
/* 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 __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 @@
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)