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Message-ID: <9d238cd6-0e11-4775-bc00-7df50f0a6638@linaro.org>
Date: Tue, 19 Mar 2024 14:02:24 +0100
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Subject: Re: [PATCH 2/4] dt-bindings: media: Add bindings for
 raspberrypi,rp1-cfe
To: Naushir Patuck <naush@raspberrypi.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>,
 linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
 devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
 linux-arm-kernel@lists.infradead.org,
 Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
 Sakari Ailus <sakari.ailus@linux.intel.com>,
 Jacopo Mondi <jacopo.mondi@ideasonboard.com>,
 Kieran Bingham <kieran.bingham@ideasonboard.com>,
 Mauro Carvalho Chehab <mchehab@kernel.org>,
 Raspberry Pi Kernel Maintenance <kernel-list@raspberrypi.com>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>,
 Florian Fainelli <florian.fainelli@broadcom.com>,
 Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
References: <20240318-rp1-cfe-v1-0-ac6d960ff22d@ideasonboard.com>
 <20240318-rp1-cfe-v1-2-ac6d960ff22d@ideasonboard.com>
 <eb854c43-1e92-4c19-bfd3-1bde94924319@linaro.org>
 <f97faeb9-8a6b-47c6-9317-daca88257802@ideasonboard.com>
 <30430e0e-70de-4831-97ad-974e350a2e54@ideasonboard.com>
 <5ca1d005-1beb-47ec-943a-9358ae3c6704@linaro.org>
 <CAEmqJPp7uGYe993L+ujth2mfRy66s8-S9FNxPY7vwkrboDq9yg@mail.gmail.com>
 <89d459dd-cc8c-4780-a56a-809e24343e69@linaro.org>
 <CAEmqJPrLP3j37Kcj0mX23x00p=gWuxZPNSUTRGNkcEqsUJ2MjQ@mail.gmail.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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On 19/03/2024 13:57, Naushir Patuck wrote:
>>>>
>>>> See writing bindings. Compatibles should be SoC specific. In some cases
>>>> generic fallbacks make sense, in some note. But don't just choose
>>>> "generic fallback" because you want. Provide rationale.
>>>
>>> If the compatible is SoC specific, I suppose "raspberrypi,rp1-cfe"
>>> would be the correct string.
>>
>> Sure, but then please think what if rp1 is on Rpi6, called exactly the
>> same (rp1), with some minor differences? Could it be?
> 
> Yes, this is definitely possible.  In such cases, I would expect the
> hardware to have a version register that would be queried by the
> driver to adjust for minor differences, and the compatible string
> remains the same.  Does that seem reasonable?

The "would expect" is concerning. The register(s) must be there already,
with proper value.

Best regards,
Krzysztof