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

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Message-ID: <20230617191314.05f12740@jic23-huawei>
Date:   Sat, 17 Jun 2023 19:13:14 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Nuno Sá <noname.nuno@...il.com>
Cc:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        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 Thu, 15 Jun 2023 14:12:57 +0200
Nuno Sá <noname.nuno@...il.com> wrote:

> 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>
Applied to the togreg branch of iio.git but as we are approaching the merge
window I'll be rebasing that on 6.5-rc1 when available.
In meantime pushed out as testing to let 0-day poke at it.

Thanks,

Jonathan

> 
> >  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,  
>