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

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Message-Id: <1545476972.2113.1@crapouillou.net>
Date:   Sat, 22 Dec 2018 12:09:32 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Rob Herring <robh@...nel.org>
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



Le mar. 18 déc. 2018 à 17:36, Rob Herring <robh@...nel.org> a écrit :
> 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?

Oops - I meant Daniel yes.

>>  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.

Yes, that's exactly the problem. I will go with a property then. Thanks!

> Sorry this is going in circles.
> 
> Rob