linux-kernel - Re: [PATCH v2 07/28] spi: s3c64xx: remove unneeded (void *) casts in of_match

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Message-ID: <CAPLW+4mJ5BxwhKwi2Z2pMOu1D0N0KaaW7=C1sZ0PV51iOHSw8Q@mail.gmail.com>
Date: Fri, 26 Jan 2024 13:40:36 -0600
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: broonie@...nel.org, andi.shyti@...nel.org, arnd@...db.de, 
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	alim.akhtar@...sung.com, linux-spi@...r.kernel.org, 
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-arch@...r.kernel.org, andre.draszik@...aro.org, 
	peter.griffin@...aro.org, kernel-team@...roid.com, willmcvicker@...gle.com
Subject: Re: [PATCH v2 07/28] spi: s3c64xx: remove unneeded (void *) casts in of_match_table

On Fri, Jan 26, 2024 at 2:24 AM Tudor Ambarus <tudor.ambarus@...aroorg> wrote:
>
> Thanks for the review feedback, Sam, great catches so far!
>
> On 1/25/24 19:04, Sam Protsenko wrote:
> > On Thu, Jan 25, 2024 at 8:50 AM Tudor Ambarus <tudor.ambarus@...aro.org> wrote:
> >>
> >> of_device_id::data is an opaque pointer. No explicit cast is needed.
> >> Remove unneeded (void *) casts in of_match_table. While here align the
> >> compatible and data members.
> >>
> >> Reviewed-by: Andi Shyti <andi.shyti@...nel.org>
> >> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> >> ---
> >>  drivers/spi/spi-s3c64xx.c | 45 +++++++++++++++++++++++----------------
> >>  1 file changed, 27 insertions(+), 18 deletions(-)
> >>
> >> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
> >> index 230fda2b3417..137faf9f2697 100644
> >> --- a/drivers/spi/spi-s3c64xx.c
> >> +++ b/drivers/spi/spi-s3c64xx.c
> >> @@ -1511,32 +1511,41 @@ static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
> >>  };
> >>
> >>  static const struct of_device_id s3c64xx_spi_dt_match[] = {
> >> -       { .compatible = "samsung,s3c2443-spi",
> >> -                       .data = (void *)&s3c2443_spi_port_config,
> >
> > I support removing (void *) cast. But this new braces style:
> >
> >       },
> >       {
>
> this style was there before my patch.
> >
> > seems to bloat the code a bit. For my taste, having something like },
> > { on the same line would be more compact, and more canonical so to
>
> I don't lean towards neither of the styles, I'm ok with both
>
> > speak. Or even preserving the existing style would be ok too, for that
> > matter.
> >
>
> seeing .compatible and .data unaligned hurt my eyes and I think that
> aligning them while dropping the cast is fine. I don't really want to do
> the style change unless you, Andi or Mark insist. Would you please come
> with a patch on top if you really want them changed?
>

But that would completely undermine the whole point of the review? I'd
prefer this style:

.. = {
    {
        .compatible =
        .data =
    }, {
        .compatible =
        .data =
    },
    { /* sentinel */ },
};

That seems more canonical to me, and more compact too, with no
contradictions to your preference about alignment too. But that's only
my opinion, as a reviewer.

> > Assuming the braces style is fixed, you can add:
> >
> > Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>
> >
> >> +       {
> >> +               .compatible = "samsung,s3c2443-spi",
> >> +               .data = &s3c2443_spi_port_config,
> >>         },
> >> -       { .compatible = "samsung,s3c6410-spi",
> >> -                       .data = (void *)&s3c6410_spi_port_config,
> >> +       {
> >> +               .compatible = "samsung,s3c6410-spi",
> >> +               .data = &s3c6410_spi_port_config,
> >>         },
> >> -       { .compatible = "samsung,s5pv210-spi",
> >> -                       .data = (void *)&s5pv210_spi_port_config,
> >> +       {
> >> +               .compatible = "samsung,s5pv210-spi",
> >> +               .data = &s5pv210_spi_port_config,
> >>         },
> >> -       { .compatible = "samsung,exynos4210-spi",
> >> -                       .data = (void *)&exynos4_spi_port_config,
> >> +       {
> >> +               .compatible = "samsung,exynos4210-spi",
> >> +               .data = &exynos4_spi_port_config,
> >>         },
> >> -       { .compatible = "samsung,exynos7-spi",
> >> -                       .data = (void *)&exynos7_spi_port_config,
> >> +       {
> >> +               .compatible = "samsung,exynos7-spi",
> >> +               .data = &exynos7_spi_port_config,
> >>         },
> >> -       { .compatible = "samsung,exynos5433-spi",
> >> -                       .data = (void *)&exynos5433_spi_port_config,
> >> +       {
> >> +               .compatible = "samsung,exynos5433-spi",
> >> +               .data = &exynos5433_spi_port_config,
> >>         },
> >> -       { .compatible = "samsung,exynos850-spi",
> >> -                       .data = (void *)&exynos850_spi_port_config,
> >> +       {
> >> +               .compatible = "samsung,exynos850-spi",
> >> +               .data = &exynos850_spi_port_config,
> >>         },
> >> -       { .compatible = "samsung,exynosautov9-spi",
> >> -                       .data = (void *)&exynosautov9_spi_port_config,
> >> +       {
> >> +               .compatible = "samsung,exynosautov9-spi",
> >> +               .data = &exynosautov9_spi_port_config,
> >>         },
> >> -       { .compatible = "tesla,fsd-spi",
> >> -                       .data = (void *)&fsd_spi_port_config,
> >> +       {
> >> +               .compatible = "tesla,fsd-spi",
> >> +               .data = &fsd_spi_port_config,
> >>         },
> >>         { },
> >>  };
> >> --
> >> 2.43.0.429.g432eaa2c6b-goog
> >>