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authorMika Westerberg <mika.westerberg@linux.intel.com>2013-01-17 12:31:06 +0200
committerWolfram Sang <w.sang@pengutronix.de>2013-01-28 05:26:42 +0100
commit7272194ed391f9db8bb320c50d715e7e6bba8ff3 (patch)
treeff8aa304c2d9d345b961d6d91f9460d5957b68a1 /drivers/i2c
parent17a76b4b32aca7c19df6988213dfe2eb4b631431 (diff)
i2c-designware: add minimal support for runtime PM
In order to save power the device should be put to low power states whenever it is not being used. We implement this by enabling minimal runtime PM support. There isn't much to do for the device itself as it is disabled once the last transfer is completed but subsystem/domain runtime PM hooks can save more power by power gating the device etc. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 343357a2b5b..d8afc85420b 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -37,6 +37,7 @@
#include <linux/of_i2c.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
+#include <linux/pm_runtime.h>
#include <linux/io.h>
#include <linux/slab.h>
#include "i2c-designware-core.h"
@@ -149,6 +150,10 @@ static int dw_i2c_probe(struct platform_device *pdev)
}
of_i2c_register_devices(adap);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_put(&pdev->dev);
+
return 0;
err_free_irq:
@@ -175,6 +180,8 @@ static int dw_i2c_remove(struct platform_device *pdev)
struct resource *mem;
platform_set_drvdata(pdev, NULL);
+ pm_runtime_get_sync(&pdev->dev);
+
i2c_del_adapter(&dev->adapter);
put_device(&pdev->dev);
@@ -186,6 +193,9 @@ static int dw_i2c_remove(struct platform_device *pdev)
free_irq(dev->irq, dev);
kfree(dev);
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(mem->start, resource_size(mem));
return 0;