linux-kernel - Re: [PATCH v2 3/3] iio: imu: adis16480: Improve getting the optional clocks

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Date:   Wed, 27 Apr 2022 19:37:50 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sá <nuno.sa@...log.com>
Subject: Re: [PATCH v2 3/3] iio: imu: adis16480: Improve getting the
 optional clocks

On Thu, 14 Apr 2022 16:15:59 +0300
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> The extended clocks are optional and may not be present for some
> configurations supported by this driver. Nevertheless, in case
> the clock is provided but some error happens during its getting,
> that error handling should be done properly.
> 
> Use devm_clk_get_optional() API and report possible errors using
> dev_err_probe() to handle properly -EPROBE_DEFER error.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Nuno Sá <nuno.sa@...log.com>
Series applied with Nuno's Tested-by as sent to v1.

Thanks,

Jonathan

> ---
> v2: added tag (Nuno), massaged commit message (Nuno)
>  drivers/iio/imu/adis16480.c | 26 ++++++++++----------------
>  1 file changed, 10 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
> index 287914016f28..fe520194a837 100644
> --- a/drivers/iio/imu/adis16480.c
> +++ b/drivers/iio/imu/adis16480.c
> @@ -1362,31 +1362,25 @@ static int adis16480_get_ext_clocks(struct adis16480 *st)
>  {
>  	struct device *dev = &st->adis.spi->dev;
>  
> -	st->clk_mode = ADIS16480_CLK_INT;
> -	st->ext_clk = devm_clk_get(dev, "sync");
> -	if (!IS_ERR_OR_NULL(st->ext_clk)) {
> +	st->ext_clk = devm_clk_get_optional(dev, "sync");
> +	if (IS_ERR(st->ext_clk))
> +		return dev_err_probe(dev, PTR_ERR(st->ext_clk), "failed to get ext clk\n");
> +	if (st->ext_clk) {
>  		st->clk_mode = ADIS16480_CLK_SYNC;
>  		return 0;
>  	}
>  
> -	if (PTR_ERR(st->ext_clk) != -ENOENT) {
> -		dev_err(dev, "failed to get ext clk\n");
> -		return PTR_ERR(st->ext_clk);
> -	}
> -
>  	if (st->chip_info->has_pps_clk_mode) {
> -		st->ext_clk = devm_clk_get(dev, "pps");
> -		if (!IS_ERR_OR_NULL(st->ext_clk)) {
> +		st->ext_clk = devm_clk_get_optional(dev, "pps");
> +		if (IS_ERR(st->ext_clk))
> +			return dev_err_probe(dev, PTR_ERR(st->ext_clk), "failed to get ext clk\n");
> +		if (st->ext_clk) {
>  			st->clk_mode = ADIS16480_CLK_PPS;
>  			return 0;
>  		}
> -
> -		if (PTR_ERR(st->ext_clk) != -ENOENT) {
> -			dev_err(dev, "failed to get ext clk\n");
> -			return PTR_ERR(st->ext_clk);
> -		}
>  	}
>  
> +	st->clk_mode = ADIS16480_CLK_INT;
>  	return 0;
>  }
>  
> @@ -1447,7 +1441,7 @@ static int adis16480_probe(struct spi_device *spi)
>  	if (ret)
>  		return ret;
>  
> -	if (!IS_ERR_OR_NULL(st->ext_clk)) {
> +	if (st->ext_clk) {
>  		ret = adis16480_ext_clk_config(st, true);
>  		if (ret)
>  			return ret;