linux-kernel - Re: [PATCH v5 08/13] dt-bindings: pwm: update bindings for MT7628 SoC

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Message-ID: <20190824003658.66hisfvhkbkc3pub@pengutronix.de>
Date:   Sat, 24 Aug 2019 02:36:58 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:     Sam Shih <sam.shih@...iatek.com>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-pwm@...r.kernel.org, Ryder Lee <ryder.lee@...iatek.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, John Crispin <john@...ozen.org>
Subject: Re: [PATCH v5 08/13] dt-bindings: pwm: update bindings for MT7628 SoC

On Thu, Aug 22, 2019 at 04:12:20PM +0800, Yingjoe Chen wrote:
> On Thu, 2019-08-22 at 14:58 +0800, Sam Shih wrote:
> > This updates bindings for MT7628 pwm controller.
> > 
> > Signed-off-by: Sam Shih <sam.shih@...iatek.com>
> > ---
> >  Documentation/devicetree/bindings/pwm/pwm-mediatek.txt | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt b/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
> > index ea95b490a913..93980e3da261 100644
> > --- a/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
> > +++ b/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
> > @@ -21,6 +21,10 @@ Required properties:
> >     See pinctrl/pinctrl-bindings.txt for details of the property values.
> >   - num-pwms: the number of PWM channels.
> > +
> > + Optional properties:
> > + - clock-frequency: fix clock frequency, this is only used in MT7628 SoC
> > +                    for period calculation. This SoC has no complex clock tree.
> 
> I'm sorry if this has been discussed before. 
> 
> Would it be simpler if you just provide a fixed-clock as clock in device
> tree? This way you don't need this optional properties and don't need to
> special handle it in driver code. 
> 
> After all, the hw is still connected to a simple clock tree.

This is what I just wrote in reply to patch 3 (which implements handling
the clock-frequency property) even before reading your feedback. So I
fully agree.

Best regards
Uwe

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