linux-kernel - Fwd: [PATCH v3 1/6] Documentation: ARM: sunxi: pwm: add Allwinner sun8i.

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Message-ID: <CAJeuY7_gx=PBhF4t40nCCWia-aq1G3t9D9nKS7ejOh56t2RkHQ@mail.gmail.com>
Date:   Tue, 12 Mar 2019 13:03:19 +0800
From:   Hao Zhang <hao5781286@...il.com>
To:     Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>, sboyd@...nel.org,
        linux-gpio@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>, linux-pwm@...r.kernel.org,
        linux-sunxi@...glegroups.com, Hao Zhang <hao5781286@...il.com>
Subject: Fwd: [PATCH v3 1/6] Documentation: ARM: sunxi: pwm: add Allwinner sun8i.

---------- Forwarded message ---------
From: Hao Zhang <hao5781286@...il.com>
Date: 2019年3月12日周二 下午12:59
Subject: Re: [PATCH v3 1/6] Documentation: ARM: sunxi: pwm: add Allwinner sun8i.
To: Thierry Reding <thierry.reding@...il.com>


Thierry Reding <thierry.reding@...il.com> 于2018年12月21日周五 上午1:50写道：
>
> On Mon, Nov 26, 2018 at 12:18:59AM +0800, Hao Zhang wrote:
> > This patch adds Allwinner sun8i pwm binding document.
> >
> > Signed-off-by: Hao Zhang <hao5781286@...il.com>
> > ---
> >  .../devicetree/bindings/pwm/pwm-sun8i.txt          | 24 ++++++++++++++++++++++
> >  1 file changed, 24 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sun8i.txt
> >
> > diff --git a/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt b/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt
> > new file mode 100644
> > index 0000000..7531d85
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pwm/pwm-sun8i.txt
> > @@ -0,0 +1,24 @@
> > +Allwinner sun8i R40/V40/T3 SoC PWM controller
> > +
> > +Required properties:
> > +  - compatible: Should be one of:
> > +    - "allwinner,sun8i-r40-pwm"
> > +  - reg: Physical base address and length of the controller's registers
> > +  - interrupts: Should contain interrupt.
> > +  - clocks: From common clock binding, handle to the parent clock.
> > +  - clock-names: Must contain the clock names described just above.
> > +  - pwm-channels: PWM channels of the controller.
>
> Why do you need this? In the cover letter you say:
>
>         "The sun8i R40/T3/V40 PWM has 8 PWM channals ..."
>
> Why does this need to be specified in the DT?

T3 PWM has 8 channals, i think it is necessary to tell user how to
specify it Instead of
hardcode the channal myself :)

Thanks for review :)

>
> Thierry
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