Re: [PATCH 2/2] i2c-s3c2410: Add stub runtime power management

[Ben Dooks <ben-i2c-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org>]

On Sat, Jan 21, 2012 at 01:28:47PM +0000, Mark Brown wrote:
> Add stub runtime_pm calls which go through the flow of enabling and
> disabling but don't actually do anything with the device itself as
> there's nothing useful we can do. This provides the core PM framework
> with information about when the device is idle, enabling chip wide
> power savings.
> 
> Signed-off-by: Mark Brown <broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
> Acked-by: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>

I've applied these two to for-34/i2c/i2c-samsung and will start a -next
branch later in the week

> ---
>  drivers/i2c/busses/i2c-s3c2410.c |   10 ++++++++++
>  1 files changed, 10 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
> index e6f982b..737f721 100644
> --- a/drivers/i2c/busses/i2c-s3c2410.c
> +++ b/drivers/i2c/busses/i2c-s3c2410.c
> @@ -31,6 +31,7 @@
>  #include <linux/errno.h>
>  #include <linux/err.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/clk.h>
>  #include <linux/cpufreq.h>
>  #include <linux/slab.h>
> @@ -564,6 +565,7 @@ static int s3c24xx_i2c_xfer(struct i2c_adapter *adap,
>  	int retry;
>  	int ret;
>  
> +	pm_runtime_get_sync(&adap->dev);
>  	clk_enable(i2c->clk);
>  
>  	for (retry = 0; retry < adap->retries; retry++) {
> @@ -572,6 +574,7 @@ static int s3c24xx_i2c_xfer(struct i2c_adapter *adap,
>  
>  		if (ret != -EAGAIN) {
>  			clk_disable(i2c->clk);
> +			pm_runtime_put_sync(&adap->dev);
>  			return ret;
>  		}
>  
> @@ -581,6 +584,7 @@ static int s3c24xx_i2c_xfer(struct i2c_adapter *adap,
>  	}
>  
>  	clk_disable(i2c->clk);
> +	pm_runtime_put_sync(&adap->dev);
>  	return -EREMOTEIO;
>  }
>  
> @@ -1013,6 +1017,9 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
>  	of_i2c_register_devices(&i2c->adap);
>  	platform_set_drvdata(pdev, i2c);
>  
> +	pm_runtime_enable(&pdev->dev);
> +	pm_runtime_enable(&i2c->adap.dev);
> +
>  	dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
>  	clk_disable(i2c->clk);
>  	return 0;
> @@ -1047,6 +1054,9 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
>  {
>  	struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
>  
> +	pm_runtime_disable(&i2c->adap.dev);
> +	pm_runtime_disable(&pdev->dev);
> +
>  	s3c24xx_i2c_deregister_cpufreq(i2c);
>  
>  	i2c_del_adapter(&i2c->adap);
> -- 
> 1.7.7.3
> 
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