Commit 01fa68b5 authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
Browse files

clocksource: sh_cmt: Runtime PM support 



Add Runtime PM support to the CMT driver.

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

Signed-off-by: default avatarMagnus Damm <damm@opensource.se>
Acked-by: default avatarJohn Stultz <johnstul@us.ibm.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 3593f5fe

drivers/clocksource/sh_cmt.c

+10 −2
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/ioport.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>
@@ -152,10 +153,12 @@ static int sh_cmt_enable(struct sh_cmt_priv *p, unsigned long *rate) 
{

	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;

	}
@@ -187,8 +190,9 @@ static void sh_cmt_disable(struct sh_cmt_priv *p) 
	/* disable interrupts in CMT block */

	sh_cmt_write(p, CMCSR, 0);



	/* stop clock */

	/* stop clock and mark device as idle */

	clk_disable(p->clk);

	pm_runtime_put_sync(&p->pdev->dev);

}



/* private flags */
@@ -660,6 +664,7 @@ static int __devinit sh_cmt_probe(struct platform_device *pdev) 


	if (p) {

		dev_info(&pdev->dev, "kept as earlytimer\n");

		pm_runtime_enable(&pdev->dev);

		return 0;

	}
@@ -674,6 +679,9 @@ static int __devinit sh_cmt_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;

}