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

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Date:   Wed, 18 Oct 2023 17:32:02 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>,
        linux-clk@...r.kernel.org
Cc:     tsbogend@...ha.franken.de, 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

Quoting Sergio Paracuellos (2023-08-26 19:39:32)
> 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>
> ---

Applied to clk-next