linux-kernel - Re: [PATCH] iio: adc: ad7192: Simplify using devm_clk_get_optional

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Message-ID: <55a46a8cffef60758f0136f389909e307fa1ade4.camel@gmail.com>
Date:   Thu, 15 Jun 2023 14:12:57 +0200
From:   Nuno Sá <noname.nuno@...il.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH] iio: adc: ad7192: Simplify using
 devm_clk_get_optional_enabled()

On Wed, 2023-06-14 at 22:26 +0200, Christophe JAILLET wrote:
> If st->mclk is not NULL, then st->clock_sel is either AD7192_CLK_EXT_MCLK2
> or AD7192_CLK_EXT_MCLK1_2.
> 
> So devm_clk_get_optional_enabled() can be used instead of hand writing it.
> This saves some line of code.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---

Reviewed-by: Nuno Sa <nuno.sa@...log.com>

>  drivers/iio/adc/ad7192.c | 16 +---------------
>  1 file changed, 1 insertion(+), 15 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
> index 8685e0b58a83..5dcb257ad754 100644
> --- a/drivers/iio/adc/ad7192.c
> +++ b/drivers/iio/adc/ad7192.c
> @@ -972,11 +972,6 @@ static void ad7192_reg_disable(void *reg)
>         regulator_disable(reg);
>  }
>  
> -static void ad7192_clk_disable(void *clk)
> -{
> -       clk_disable_unprepare(clk);
> -}
> -
>  static int ad7192_probe(struct spi_device *spi)
>  {
>         struct ad7192_state *st;
> @@ -1044,7 +1039,7 @@ static int ad7192_probe(struct spi_device *spi)
>  
>         st->fclk = AD7192_INT_FREQ_MHZ;
>  
> -       st->mclk = devm_clk_get_optional(&spi->dev, "mclk");
> +       st->mclk = devm_clk_get_optional_enabled(&spi->dev, "mclk");
>         if (IS_ERR(st->mclk))
>                 return PTR_ERR(st->mclk);
>  
> @@ -1052,15 +1047,6 @@ static int ad7192_probe(struct spi_device *spi)
>  
>         if (st->clock_sel == AD7192_CLK_EXT_MCLK1_2 ||
>             st->clock_sel == AD7192_CLK_EXT_MCLK2) {
> -               ret = clk_prepare_enable(st->mclk);
> -               if (ret < 0)
> -                       return ret;
> -
> -               ret = devm_add_action_or_reset(&spi->dev, ad7192_clk_disable,
> -                                              st->mclk);
> -               if (ret)
> -                       return ret;
> -
>                 st->fclk = clk_get_rate(st->mclk);
>                 if (!ad7192_valid_external_frequency(st->fclk)) {
>                         dev_err(&spi->dev,