linux-kernel - Re: [PATCH v8 03/26] dt-bindings: Add doc for the Ingenic TCU drivers

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Date:   Tue, 18 Dec 2018 10:36:36 -0600
From:   Rob Herring <robh@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Mathieu Malaterre <malat@...ian.org>,
        Ezequiel Garcia <ezequiel@...labora.co.uk>,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        LINUX-WATCHDOG <linux-watchdog@...r.kernel.org>,
        linux-mips@...r.kernel.org,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>, od@...c.me
Subject: Re: [PATCH v8 03/26] dt-bindings: Add doc for the Ingenic TCU drivers

On Mon, Dec 17, 2018 at 4:04 PM Paul Cercueil <paul@...pouillou.net> wrote:
>
> Hi Rob,
>
> Le lun. 17 déc. 2018 à 22:05, Rob Herring <robh@...nel.org> a écrit :
> > On Wed, Dec 12, 2018 at 11:08:58PM +0100, Paul Cercueil wrote:
> >>  Add documentation about how to properly use the Ingenic TCU
> >>  (Timer/Counter Unit) drivers from devicetree.
> >>
> >>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> >>  ---
> >>
> >>  Notes:
> >>       v4: New patch in this series. Corresponds to V2 patches 3-4-5
> >> with
> >>           added content.
> >>
> >>       v5: - Edited PWM/watchdog DT bindings documentation to point
> >> to the new
> >>             document.
> >>           - Moved main document to
> >>             Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> >>           - Updated documentation to reflect the new devicetree
> >> bindings.
> >>
> >>       v6: - Removed PWM/watchdog documentation files as asked by
> >> upstream
> >>           - Removed doc about properties that should be implicit
> >>           - Removed doc about ingenic,timer-channel /
> >>             ingenic,clocksource-channel as they are gone
> >>           - Fix WDT clock name in the binding doc
> >>           - Fix lengths of register areas in watchdog/pwm nodes
> >>
> >>       v7: No change
> >>
> >>       v8: - Fix address of the PWM node
> >>           - Added doc about system timer and clocksource children
> >> nodes
> >
> > I thought we'd sorted this out...
>
> Yeah, well I just can't please everybody. V6/V7 didn't have the
> system timer or clocksource in devicetree, which was good for
> you, but then the driver nearly doubled in size and complexity,
> and Thierry rightfully refused it. Now I'm at the point where

You mean Daniel?

> I'm trying alternative ways of encoding the information in
> devicetree, as suggested by various people, just so that you
> accept it. Because I don't see any other option.

Does the problem boil down to needing to reserve channel x to use PWMx
pin? If so, just do a mask property of reserved for PWM channels.

Sorry this is going in circles.

Rob