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>

diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 76d16713508f635a5d3bfc84c8fd877a58b213a8..7c335f41dc3dab7e53dd5da725cdff83726e2046 100644 (file)
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -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,
 };