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clocksource: sh_tmu: Runtime PM support

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Add Runtime PM support to the TMU driver.

The hardware device is enabled as long as the clocksource
or the clockevent portion of the driver is used.

Signed-off-by: Magnus Damm <damm@opensource.se>
Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2011-04-25 22:40:26 +09:00 committed by Paul Mundt
parent 0aeac458d9
commit 1b842e91fe
1 changed files with 10 additions and 2 deletions
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12
drivers/clocksource/sh_tmu.c
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@ -25,6 +25,7 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <linux/irq.h>
#include <linux/err.h>
#include <linux/clocksource.h>
@ -109,10 +110,12 @@ static int sh_tmu_enable(struct sh_tmu_priv *p)
{
int ret;
/* enable clock */
/* wake up device and enable clock */
pm_runtime_get_sync(&p->pdev->dev);
ret = clk_enable(p->clk);
if (ret) {
dev_err(&p->pdev->dev, "cannot enable clock\n");
pm_runtime_put_sync(&p->pdev->dev);
return ret;
}
@ -141,8 +144,9 @@ static void sh_tmu_disable(struct sh_tmu_priv *p)
/* disable interrupts in TMU block */
sh_tmu_write(p, TCR, 0x0000);
/* stop clock */
/* stop clock and mark device as idle */
clk_disable(p->clk);
pm_runtime_put_sync(&p->pdev->dev);
}
static void sh_tmu_set_next(struct sh_tmu_priv *p, unsigned long delta,
@ -411,6 +415,7 @@ static int __devinit sh_tmu_probe(struct platform_device *pdev)
if (p) {
dev_info(&pdev->dev, "kept as earlytimer\n");
pm_runtime_enable(&pdev->dev);
return 0;
}
@ -425,6 +430,9 @@ static int __devinit sh_tmu_probe(struct platform_device *pdev)
kfree(p);
platform_set_drvdata(pdev, NULL);
}
if (!is_early_platform_device(pdev))
pm_runtime_enable(&pdev->dev);
return ret;
}