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sh: MTU2: Basic runtime PM support

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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>
This commit is contained in:
Rafael J. Wysocki 2012-08-13 14:00:16 +02:00
parent bad813831e
commit 3cb6f10a4d
1 changed files with 23 additions and 6 deletions
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29
drivers/clocksource/sh_mtu2.c
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@ -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)