linux-kernel - Re: [PATCH v2 1/3] pwm: mtk_disp: clear the clock operations

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Date:   Wed, 26 May 2021 09:54:03 +0800
From:   Jitao Shi <jitao.shi@...iatek.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Yingjoe Chen (陳英洲) 
        <Yingjoe.Chen@...iatek.com>,
        Eddie Huang (黃智傑) 
        <eddie.huang@...iatek.com>,
        Cawa Cheng (鄭曄禧) 
        <cawa.cheng@...iatek.com>,
        Bibby Hsieh (謝濟遠) 
        <Bibby.Hsieh@...iatek.com>,
        CK Hu (胡俊光) 
        <ck.hu@...iatek.com>, "stonea168@....com" <stonea168@....com>,
        Huijuan Xie (谢慧娟) 
        <Huijuan.Xie@...iatek.com>
Subject: Re: [PATCH v2 1/3] pwm: mtk_disp: clear the clock operations

On Mon, 2021-02-22 at 22:29 +0800, Thierry Reding wrote:
> On Sat, Jan 30, 2021 at 10:12:24PM +0800, Jitao Shi wrote:
> > Remove the clk_prepare from mtk_disp_pwm_probe.
> > Remove the clk_unprepare from mtk_disp_pwm_remove.
> > 
> > Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> > ---
> >  drivers/pwm/pwm-mtk-disp.c | 23 ++---------------------
> >  1 file changed, 2 insertions(+), 21 deletions(-)
> 
> It's not clear *why* you're doing this change. It's already obvious from
> the changes in this patch that you're removing the calls to
> clk_prepare() and clk_unprepare(), so instead of duplicating that
> information in the commit message, take this opportunity to describe why
> this change is needed. Without any further context, this would seem to
> just break operation of this chip because now these clocks are never
> enabled in the first place.
> 
> Thierry

Thanks for your review.

I'll update the commit message next version.

The original issue is the clocks doesn't be disabled when system enter
standby.

Then I adjust the the clock sequence. and Uwe subject convert thelegacy
APIs of .apply().