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@xxxxxxxxxxxxxxx> --- drivers/i2c/busses/i2c-designware-platdrv.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 343357a..d8afc85 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; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
