linux-kernel - Re: [PATCH v6] clk: Add write operation for clk

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

Hi Sam,

On Wed, Oct 13, 2021 at 2:20 PM Sam Protsenko
<semen.protsenko@...aro.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@...aro.org>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

This is useful, thanks:

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