linux-kernel - Re: [PATCH 7/7] pwm: ep93xx: Prepare clock before using it

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Message-ID: <abf0b0cb8299f820be0d1ee32f445a956abf1202.camel@gmail.com>
Date:   Mon, 14 Jun 2021 09:30:08 +0200
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Nikita Shubin <nikita.shubin@...uefel.me>,
        linux-pwm@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de,
        H Hartley Sweeten <hsweeten@...ionengravers.com>
Subject: Re: [PATCH 7/7] pwm: ep93xx: Prepare clock before using it

Hi Uwe!

On Mon, 2021-06-14 at 09:22 +0200, Uwe Kleine-König wrote:
> > Use clk_prepare_enable()/clk_disable_unprepare() in preparation for switch
> > to Common Clock Framework.
> > 
> > Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
> 
> Maybe it would make sense to move the prepare into the probe function?!

If one thinks about real meaningful clk_prepare(), not like in EP93xx,
then clk_is_enabled_when_prepared() shall be considered and this might
change behaviour. That's why this "stupid" approach was chosen for this
conversion. Also, unfortunately, I don't have a test setup for PWM, this
made me shy towards this driver ;)

-- 
Alexander Sverdlin.