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

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Message-ID: <CAMz4kuJA+a=nzFRja4wRkfJu3Gzb0wnvaM8H4Ek9X5u8CNegPg@mail.gmail.com>
Date:   Wed, 14 Aug 2019 09:51:34 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
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

Hi Uwe,

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:
> > Add Spreadtrum PWM controller documentation.
> >
> > Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> > ---
> > Changes from v1:
> >  - Use assigned-clock-parents and assigned-clocks to set PWM clock parent.
> > ---
> >  Documentation/devicetree/bindings/pwm/pwm-sprd.txt |   38 ++++++++++++++++++++
> >  1 file changed, 38 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sprd.txt
> >
> > diff --git a/Documentation/devicetree/bindings/pwm/pwm-sprd.txt b/Documentation/devicetree/bindings/pwm/pwm-sprd.txt
> > new file mode 100644
> > index 0000000..e6cf312
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pwm/pwm-sprd.txt
> > @@ -0,0 +1,38 @@
> > +Spreadtrum PWM controller
> > +
> > +Spreadtrum SoCs PWM controller provides 4 PWM channels.
> > +
> > +Required porperties:
>
> s/porperties/properties/

Sorry for typos, will fix in next version.

>
> > +- compatible : Should be "sprd,ums512-pwm".
> > +- reg: Physical base address and length of the controller's registers.
> > +- clocks: The phandle and specifier referencing the controller's clocks.
> > +- clock-names: Should contain following entries:
> > +  "pwmn": used to derive the functional clock for PWM channel n (n range: 0 ~ 3).
> > +  "enablen": for PWM channel n enable clock (n range: 0 ~ 3).
> > +- assigned-clocks: Reference to the PWM clock entroes.
>
> s/entroes/entries/

Sure.

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

-- 
Baolin Wang
Best Regards