linux-kernel - Re: [PATCH v2 1/2] dt-bindings: pwm: sprd: Add Spreadtrum PWM documentation

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Message-ID: <20190814070121.o53tj2mtky4hcy3n@pengutronix.de>
Date:   Wed, 14 Aug 2019 09:01:21 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        linux-pwm@...r.kernel.org, DTML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] dt-bindings: pwm: sprd: Add Spreadtrum PWM
 documentation

Hello Baolin,

On Wed, Aug 14, 2019 at 09:51:34AM +0800, Baolin Wang wrote:
> On Tue, 13 Aug 2019 at 22:13, Uwe Kleine-König
> <u.kleine-koenig@...gutronix.de> wrote:
> > On Tue, Aug 13, 2019 at 09:46:40PM +0800, Baolin Wang wrote:
> > > +- assigned-clock-parents: The phandle of the parent clock of PWM clock.
> >
> > I'm not sure you need to point out assigned-clocks and
> > assigned-clock-parents as this is general clk stuff. Also I wonder if
> > these should be "required properties".
> 
> I think I should describe any properties used by PWM node, like
> 'clocks' and 'clock-names' properties, though they are common clock
> properties.

Then you might want to describe also "status", "assigned-clock-rates",
"pinctrl-$n", "pinctrl-names", "power-domains", "power-domain-names" and
probably another dozen I'm not aware of.

> Yes, they are required. Thanks for your comments.

required in which sense? Why can a Spreadtrum PWM not work when the
clock parents are unspecified?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |