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authorMagnus Damm <damm@opensource.se>2011-04-25 22:40:26 +0900
committerPaul Mundt <lethal@linux-sh.org>2011-05-23 14:34:07 +0900
commit1b842e91fea9447eff5eb687e28ad61c02f5033e (patch)
tree294d8962d4337153597bac12b9b53d39f28be2b3
parentclocksource: sh_tmu: __clocksource_updatefreq_hz() update (diff)
downloadlinux-dev-1b842e91fea9447eff5eb687e28ad61c02f5033e.tar.xz
linux-dev-1b842e91fea9447eff5eb687e28ad61c02f5033e.zip
clocksource: sh_tmu: Runtime PM support
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>
Diffstat (limited to '')
-rw-r--r--drivers/clocksource/sh_tmu.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index 808135768617..17296288a205 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -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;
}