Re: [PATCH v4 1/3] bus: simple-pm: add support to pm clocks

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[+cc Geert, Kevin, Simon]

On Mon, Nov 14, 2016 at 11:15:53AM +0000, Srinivas Kandagatla wrote:
> This patch adds support to pm clocks via device tree, so that the clocks
> can be turned on and off during runtime pm. This patch is required for
> Qualcomm msm8996 pcie controller which sits on a bus with its own
> power-domain and clocks.
> 
> Without this patch the clock associated with the bus are never turned on.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>

I don't see a formal maintainer for drivers/bus/simple-pm-bus.c, but I'd
like an ack or at least a review from Geert or Simon.

> ---
>  drivers/bus/simple-pm-bus.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c
> index c5eb46c..63b7e8c 100644
> --- a/drivers/bus/simple-pm-bus.c
> +++ b/drivers/bus/simple-pm-bus.c
> @@ -11,6 +11,7 @@
>  #include <linux/module.h>
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_clock.h>
>  #include <linux/pm_runtime.h>
>  
>  
> @@ -22,17 +23,26 @@ static int simple_pm_bus_probe(struct platform_device *pdev)
>  
>  	pm_runtime_enable(&pdev->dev);
>  
> -	if (np)
> +	if (np) {
> +		of_pm_clk_add_clks(&pdev->dev);
>  		of_platform_populate(np, NULL, NULL, &pdev->dev);
> +	}
>  
>  	return 0;
>  }
>  
> +static const struct dev_pm_ops simple_pm_bus_pm_ops = {
> +	SET_RUNTIME_PM_OPS(pm_clk_suspend,
> +			   pm_clk_resume, NULL)
> +};
> +
>  static int simple_pm_bus_remove(struct platform_device *pdev)
>  {
>  	dev_dbg(&pdev->dev, "%s\n", __func__);
>  
>  	pm_runtime_disable(&pdev->dev);
> +	pm_clk_destroy(&pdev->dev);
> +
>  	return 0;
>  }
>  
> @@ -48,6 +58,7 @@ static struct platform_driver simple_pm_bus_driver = {
>  	.driver = {
>  		.name = "simple-pm-bus",
>  		.of_match_table = simple_pm_bus_of_match,
> +		.pm = &simple_pm_bus_pm_ops,
>  	},
>  };
>  
> -- 
> 2.10.1
> 
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