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>

diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index 80813576861781194f235f52507480e1d44a92f7..17296288a2052ef757a5e22b6a0d3e52d37036ee 100644 (file)
--- 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;
 }