linux-kernel - Re: [PATCH 0/3] ARM: st: use a correct pwr compatible for stm32mp15

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Date: Fri, 26 Apr 2024 13:41:12 +0200
From: Patrick DELAUNAY <patrick.delaunay@...s.st.com>
To: Rob Herring <robh@...nel.org>
CC: Alexandre TORGUE <alexandre.torgue@...s.st.com>,
        Liam Girdwood
	<lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Olivier Moysan <olivier.moysan@...s.st.com>,
        Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
        Pascal Paillet
	<p.paillet@...s.st.com>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH 0/3] ARM: st: use a correct pwr compatible for stm32mp15

Hi,

On 4/25/24 18:30, Rob Herring wrote:
> On Thu, Apr 25, 2024 at 09:48:31AM +0200, Patrick Delaunay wrote:
>> This patchset removes the unexpected comma in the PWR compatible
>> "st,stm32mp1,pwr-reg" and uses a new compatible "st,stm32mp1-pwr-reg"
>> in STM3MP15 device trees.
> Why? I don't see any warnings from this. Yes, we wouldn't new cases
> following this pattern, but I don't think it is worth maintaining
> support for both strings. We're stuck with it. And the only way to
> maintain forward compatibility is:


Yes, no warning because the compatible string are not yet checked by tools.


I propose this patch to avoid the usage of this compatible for other SoC 
in STM32MP1 family.


I see the invalid compatible string when I reviewed the U-Boot patch to 
add the PWR node for STM32MP13 family:

https://patchwork.ozlabs.org/project/uboot/patch/20240319024534.103299-1-marex@denx.de/


So I prefer change the PWR binding before to have the same patch applied 
on Linux device tree

> compatible = "st,stm32mp1-pwr-reg", "st,stm32mp1,pwr-reg";


Yes, I will update the SoC patch with you proposal.

it is the only way to have compatibility of OLD Linux kernel (with old 
driver) with NEW device tree.

I miss this compatibility issue.


>
> Rob
>
>
>
Regards

Patrick