Re: [PATCH -next v2 11/25] spi: dw-bt1: Use helper function devm_clk_get_enabled()

[Serge Semin <fancer.lancer@xxxxxxxxx>]

On Wed, Aug 23, 2023 at 09:39:24PM +0800, Li Zetao wrote:
> Since commit 7ef9651e9792 ("clk: Provide new devm_clk helpers for prepared
> and enabled clocks"), devm_clk_get() and clk_prepare_enable() can now be
> replaced by devm_clk_get_enabled() when driver enables (and possibly
> prepares) the clocks for the whole lifetime of the device. Moreover, it is
> no longer necessary to unprepare and disable the clocks explicitly.
> 

> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Acked-by: Serge Semin <fancer.lancer@xxxxxxxxx>
> Signed-off-by: Li Zetao <lizetao1@xxxxxxxxxx>

Just for the record, the tags order is normally supposed to reflect a
patch route. Even though AFAICS it's explicitly defined for the Sob
tags only (see Documentation/process/submitting-patches.rst), but
almost all kernel developers apply that rule to all the tags. See the
kernel git log as the brightest example. So your Sob tag should have
been kept first, then either my Ab or Jonathan' Rb tags.

-Serge(y)

> ---
> v1 -> v2: None
> 
>  drivers/spi/spi-dw-bt1.c | 23 +++++------------------
>  1 file changed, 5 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/spi/spi-dw-bt1.c b/drivers/spi/spi-dw-bt1.c
> index 5e1c01822967..5391bcac305c 100644
> --- a/drivers/spi/spi-dw-bt1.c
> +++ b/drivers/spi/spi-dw-bt1.c
> @@ -269,43 +269,32 @@ static int dw_spi_bt1_probe(struct platform_device *pdev)
>  
>  	dws->paddr = mem->start;
>  
> -	dwsbt1->clk = devm_clk_get(&pdev->dev, NULL);
> +	dwsbt1->clk = devm_clk_get_enabled(&pdev->dev, NULL);
>  	if (IS_ERR(dwsbt1->clk))
>  		return PTR_ERR(dwsbt1->clk);
>  
> -	ret = clk_prepare_enable(dwsbt1->clk);
> -	if (ret)
> -		return ret;
> -
>  	dws->bus_num = pdev->id;
>  	dws->reg_io_width = 4;
>  	dws->max_freq = clk_get_rate(dwsbt1->clk);
> -	if (!dws->max_freq) {
> -		ret = -EINVAL;
> -		goto err_disable_clk;
> -	}
> +	if (!dws->max_freq)
> +		return -EINVAL;
>  
>  	init_func = device_get_match_data(&pdev->dev);
>  	ret = init_func(pdev, dwsbt1);
>  	if (ret)
> -		goto err_disable_clk;
> +		return ret;
>  
>  	pm_runtime_enable(&pdev->dev);
>  
>  	ret = dw_spi_add_host(&pdev->dev, dws);
>  	if (ret) {
>  		pm_runtime_disable(&pdev->dev);
> -		goto err_disable_clk;
> +		return ret;
>  	}
>  
>  	platform_set_drvdata(pdev, dwsbt1);
>  
>  	return 0;
> -
> -err_disable_clk:
> -	clk_disable_unprepare(dwsbt1->clk);
> -
> -	return ret;
>  }
>  
>  static void dw_spi_bt1_remove(struct platform_device *pdev)
> @@ -315,8 +304,6 @@ static void dw_spi_bt1_remove(struct platform_device *pdev)
>  	dw_spi_remove_host(&dwsbt1->dws);
>  
>  	pm_runtime_disable(&pdev->dev);
> -
> -	clk_disable_unprepare(dwsbt1->clk);
>  }
>  
>  static const struct of_device_id dw_spi_bt1_of_match[] = {
> -- 
> 2.34.1
>