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i2c: at91: add support for system PM 

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wenyou Yang 2014-10-24 14:50:16 +08:00 committed by Wolfram Sang
parent d64a818859
commit 36765293cd
1 changed files with 26 additions and 0 deletions
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26
drivers/i2c/busses/i2c-at91.c
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@ -861,7 +861,33 @@ static int at91_twi_runtime_resume(struct device *dev)
return clk_prepare_enable(twi_dev->clk);
}
static int at91_twi_suspend_noirq(struct device *dev)
{
if (!pm_runtime_status_suspended(dev))
at91_twi_runtime_suspend(dev);
return 0;
}
static int at91_twi_resume_noirq(struct device *dev)
{
int ret;
if (!pm_runtime_status_suspended(dev)) {
ret = at91_twi_runtime_resume(dev);
if (ret)
return ret;
}
pm_runtime_mark_last_busy(dev);
pm_request_autosuspend(dev);
return 0;
}
static const struct dev_pm_ops at91_twi_pm = {
.suspend_noirq = at91_twi_suspend_noirq,
.resume_noirq = at91_twi_resume_noirq,
.runtime_suspend = at91_twi_runtime_suspend,
.runtime_resume = at91_twi_runtime_resume,
};