linux-kernel - Re: [PATCH] ARM: dts: stm32: set stm32mp157c-odyssey DCMI pins

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Message-ID: <7af54c28-1cc1-775e-a544-45a0f5f9957e@pengutronix.de>
Date:   Thu, 3 Jun 2021 16:58:57 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Grzegorz Szymaszek <gszymaszek@...rt.pl>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Marcin Sloniewski <marcin.sloniewski@...il.com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH] ARM: dts: stm32: set stm32mp157c-odyssey DCMI pins

On 03.06.21 16:49, Grzegorz Szymaszek wrote:
> Hello Ahmad,
> 
> On Thu, Jun 03, 2021 at 04:26:59PM +0200, Ahmad Fatoum wrote:
>> On 03.06.21 16:23, Grzegorz Szymaszek wrote:
>>> The Seeed Odyssey-STM32MP157C board has a 20-pin DVP camera output.
>>> stm32mp15-pinctrl.dtsi contains one pin state definition for the DCMI
>>> interface, dcmi-0, AKA phandle dcmi_pins_a. This definition is
>>> incompatible with the pins used on the Odyssey board, where:
>>> - there are 8 data pins instead of 12,
>>> - […]
>>>
>>> Override the dcmi_pins_a definition (as well as dcmi_sleep_pins_a) in
>>> the Odyssey device tree.
>>
>> Rather define a new pinctrl group (e.g. &dcmi_pins_b) and use that
>> instead of overriding an existing one.
> 
> Can I simply use dcmi_pins_b (as the first unused identifier) or is
> there some way to match specific pin groups to an identifier (b, c, d,
> and so on)?

Just take the next available. That's how I did it so far.

>> Current convention is also to place all STM32MP1 pinctrl nodes into
>> a central file, not in the individual board device trees.
> 
> Sure, I will update the patch.
> 
> Thanks for your comments!

Cheers,
Ahmad

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