Re: [PATCH 06/13] iio: adc: rockchip_saradc: Benefit from devm_clk_get_enabled() to simplify

[Jonathan Cameron <jic23@kernel.org>]

On Mon,  8 Aug 2022 22:47:33 +0200
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

> Make use of devm_clk_get_enabled() to replace some code that effectively
> open codes this new function.
> 
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

This might have side effects as it now enables the clock before calling
the clk_set_rate(). Also changes the clock start up ordering. Neither is that
scary a change, but on really fussy hardware they might cause problems.

Add a few rock-chips people who have sent patches in last few years
to hopefully take a look or even better run a test.

Thanks,

Jonathan
	
> ---
>  drivers/iio/adc/rockchip_saradc.c | 44 ++-----------------------------
>  1 file changed, 2 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
> index b87ea7148b58..db1190faa223 100644
> --- a/drivers/iio/adc/rockchip_saradc.c
> +++ b/drivers/iio/adc/rockchip_saradc.c
> @@ -233,20 +233,6 @@ static void rockchip_saradc_reset_controller(struct reset_control *reset)
>  	reset_control_deassert(reset);
>  }
>  
> -static void rockchip_saradc_clk_disable(void *data)
> -{
> -	struct rockchip_saradc *info = data;
> -
> -	clk_disable_unprepare(info->clk);
> -}
> -
> -static void rockchip_saradc_pclk_disable(void *data)
> -{
> -	struct rockchip_saradc *info = data;
> -
> -	clk_disable_unprepare(info->pclk);
> -}
> -
>  static void rockchip_saradc_regulator_disable(void *data)
>  {
>  	struct rockchip_saradc *info = data;
> @@ -380,12 +366,12 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	info->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
> +	info->pclk = devm_clk_get_enabled(&pdev->dev, "apb_pclk");
>  	if (IS_ERR(info->pclk))
>  		return dev_err_probe(&pdev->dev, PTR_ERR(info->pclk),
>  				     "failed to get pclk\n");
>  
> -	info->clk = devm_clk_get(&pdev->dev, "saradc");
> +	info->clk = devm_clk_get_enabled(&pdev->dev, "saradc");
>  	if (IS_ERR(info->clk))
>  		return dev_err_probe(&pdev->dev, PTR_ERR(info->clk),
>  				     "failed to get adc clock\n");
> @@ -427,32 +413,6 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
>  
>  	info->uv_vref = ret;
>  
> -	ret = clk_prepare_enable(info->pclk);
> -	if (ret < 0) {
> -		dev_err(&pdev->dev, "failed to enable pclk\n");
> -		return ret;
> -	}
> -	ret = devm_add_action_or_reset(&pdev->dev,
> -				       rockchip_saradc_pclk_disable, info);
> -	if (ret) {
> -		dev_err(&pdev->dev, "failed to register devm action, %d\n",
> -			ret);
> -		return ret;
> -	}
> -
> -	ret = clk_prepare_enable(info->clk);
> -	if (ret < 0) {
> -		dev_err(&pdev->dev, "failed to enable converter clock\n");
> -		return ret;
> -	}
> -	ret = devm_add_action_or_reset(&pdev->dev,
> -				       rockchip_saradc_clk_disable, info);
> -	if (ret) {
> -		dev_err(&pdev->dev, "failed to register devm action, %d\n",
> -			ret);
> -		return ret;
> -	}
> -
>  	platform_set_drvdata(pdev, indio_dev);
>  
>  	indio_dev->name = dev_name(&pdev->dev);