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References: <20211013172042.10884-1-semen.protsenko@linaro.org>
In-Reply-To: <20211013172042.10884-1-semen.protsenko@linaro.org>
From:   Fabio Estevam <festevam@gmail.com>
Date:   Wed, 13 Oct 2021 15:04:33 -0300
Message-ID: <CAOMZO5CT+5=py=TBUMOZKRDsacNnGWV2TPBE7RtnZ3ocBBVReA@mail.gmail.com>
Subject: Re: [PATCH v6] clk: Add write operation for clk_parent debugfs node
To:     Sam Protsenko <semen.protsenko@linaro.org>
Cc:     Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Russell King <linux@armlinux.org.uk>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Mike Tipton <mdtipton@codeaurora.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Andy Shevchenko <andy@kernel.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        linux-clk <linux-clk@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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Hi Sam,

On Wed, Oct 13, 2021 at 2:20 PM Sam Protsenko
<semen.protsenko@linaro.org> wrote:
>
> Useful for testing mux clocks. One can write the index of the parent to
> be set into clk_parent node, starting from 0. Example
>
>     # cd /sys/kernel/debug/clk/mout_peri_bus
>     # cat clk_possible_parents
>       dout_shared0_div4 dout_shared1_div4
>     # cat clk_parent
>       dout_shared0_div4
>     # echo 1 > clk_parent
>     # cat clk_parent
>       dout_shared1_div4
>
> CLOCK_ALLOW_WRITE_DEBUGFS has to be defined in drivers/clk/clk.c in
> order to use this feature.
>
> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

This is useful, thanks:

Reviewed-by: Fabio Estevam <festevam@gmail.com>