linux-kernel - Re: [PATCH v6 3/4] pwm: bcm2835: allow pwm driver to be used in atomic context

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Date:   Mon, 11 Dec 2023 15:17:28 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     Sean Young <sean@...s.org>, linux-media@...r.kernel.org,
        linux-pwm@...r.kernel.org,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/4] pwm: bcm2835: allow pwm driver to be used in
 atomic context

On Fri, Dec 08, 2023 at 06:20:40PM +0100, Uwe Kleine-König wrote:
> On Fri, Dec 08, 2023 at 05:01:26PM +0000, Sean Young wrote:
> > On Fri, Dec 08, 2023 at 05:22:52PM +0100, Thierry Reding wrote:
> > > On Wed, Nov 29, 2023 at 09:13:36AM +0000, Sean Young wrote:
> > > > clk_get_rate() may do a mutex lock. Fetch the clock rate once, and prevent
> > > > rate changes using clk_rate_exclusive_get().
> > > > 
> > > > Signed-off-by: Sean Young <sean@...s.org>
> > > > ---
> > > >  drivers/pwm/pwm-bcm2835.c | 31 +++++++++++++++++++++----------
> > > >  1 file changed, 21 insertions(+), 10 deletions(-)
> > > 
> > > s/pwm/PWM/ in the subject. Although, I guess you could just drop the
> > > "PWM" altogether because the subject prefix implies that this is for
> > > PWM.
> > 
> > $ git log --no-merges --oneline drivers/pwm/ | sed -r 's/^\w* ([^:]+): .*/\1/' | sort | uniq -c
> >    1197 pwm
> >       1 PWM
> >   ...
> > 
> > The vast majority of the commits use pwm: as a prefix, only one uses PWM:. 
> > In fact if you look across the tree almost everywhere lower case is used
> > for the prefix.
> 
> Thierry doesn't want you to change the subject prefix, but only the
> second "pwm" to make it read:
> 
> 	pwm: bcm2835: allow PWM driver to be used in atomic context
> 
> While I understand Thierry here, I'm fine with a lowercase pwm here,
> too. In my book a PWM in all uppercase is the type of hardware and pwm
> in all lowercase is the framework's name. If you use "PWM driver" or
> "pwm driver" then doesn't matter much.

I'm not fine with a lowercase "pwm" in what is clearly text. Text should
be grammatically correct and PWM being an abbreviation it should be all
caps. The framework name is also PWM, not pwm. We use the lowercase pwm
as prefix because it represents the directory where the subsystem lives
and we usually don't use capitalization in file and directory names.

Thierry

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