linux-kernel - Re: [PATCH v2] clk: ralink: mtmips: quiet unused variable warning

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Date:   Sat, 7 Oct 2023 09:20:12 +0200
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     linux-clk@...r.kernel.org
Cc:     tsbogend@...ha.franken.de, sboyd@...nel.org,
        mturquette@...libre.com, linux-kernel@...r.kernel.org,
        ndesaulniers@...gle.com, arnd@...nel.org, yangshiji66@...look.com,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] clk: ralink: mtmips: quiet unused variable warning

On Sun, Aug 27, 2023 at 4:39 AM Sergio Paracuellos
<sergio.paracuellos@...il.com> wrote:
>
> When CONFIG_OF is disabled then the matching table is not referenced and
> the following warning appears:
>
> drivers/clk/ralink/clk-mtmips.c:821:34: warning: unused variable 'mtmips_of_match' [-Wunused-const-variable]
> 821 |   static const struct of_device_id mtmips_of_match[] = {
>     |                          ^
>
> There are two match tables in the driver: one for the clock driver and the
> other for the reset driver. The only difference between them is that the
> clock driver uses 'data' and does not have 'ralink,rt2880-reset' compatible.
> Both just can be merged into a single one just by adding the compatible
> 'ralink,rt2880-reset' entry to 'mtmips_of_match[]', which will allow it to
> be used for 'mtmips_clk_driver' (which doesn't use the data) as well as for
> 'mtmips_clk_init()' (which doesn't need get called for 'ralink,rt2880-reset').
>
> Doing in this way ensures that 'CONFIG_OF' is not disabled anymore so the
> above warning disapears.
>
> Fixes: 6f3b15586eef ("clk: ralink: add clock and reset driver for MTMIPS SoCs")
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202307242310.CdOnd2py-lkp@intel.com/
> Suggested-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
> ---
> Changes in v2:
> - Merge two match tables into one to properly avoid this warning.
>
> PATCH in v1: https://lore.kernel.org/lkml/20230802092647.3000666-1-sergio.paracuellos@gmail.com/T/
>
>  drivers/clk/ralink/clk-mtmips.c | 20 +++++---------------
>  1 file changed, 5 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/clk/ralink/clk-mtmips.c b/drivers/clk/ralink/clk-mtmips.c
> index 1e7991439527..50a443bf79ec 100644
> --- a/drivers/clk/ralink/clk-mtmips.c
> +++ b/drivers/clk/ralink/clk-mtmips.c
> @@ -821,6 +821,10 @@ static const struct mtmips_clk_data mt76x8_clk_data = {
>  };
>
>  static const struct of_device_id mtmips_of_match[] = {
> +       {
> +               .compatible = "ralink,rt2880-reset",
> +               .data = NULL,
> +       },
>         {
>                 .compatible = "ralink,rt2880-sysc",
>                 .data = &rt2880_clk_data,
> @@ -1088,25 +1092,11 @@ static int mtmips_clk_probe(struct platform_device *pdev)
>         return 0;
>  }
>
> -static const struct of_device_id mtmips_clk_of_match[] = {
> -       { .compatible = "ralink,rt2880-reset" },
> -       { .compatible = "ralink,rt2880-sysc" },
> -       { .compatible = "ralink,rt3050-sysc" },
> -       { .compatible = "ralink,rt3052-sysc" },
> -       { .compatible = "ralink,rt3352-sysc" },
> -       { .compatible = "ralink,rt3883-sysc" },
> -       { .compatible = "ralink,rt5350-sysc" },
> -       { .compatible = "ralink,mt7620-sysc" },
> -       { .compatible = "ralink,mt7628-sysc" },
> -       { .compatible = "ralink,mt7688-sysc" },
> -       {}
> -};
> -
>  static struct platform_driver mtmips_clk_driver = {
>         .probe = mtmips_clk_probe,
>         .driver = {
>                 .name = "mtmips-clk",
> -               .of_match_table = mtmips_clk_of_match,
> +               .of_match_table = mtmips_of_match,
>         },
>  };
>
> --
> 2.25.1
>

Gentle ping for this patch.

Thanks,
    Sergio Paracuellos