linux-kernel - Re: [PATCH 3/3] arm64: dts: exynos: Rename compatible string property from version to SOC specific

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Date:   Fri, 4 Nov 2022 08:53:21 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Aakarsh Jain <aakarsh.jain@...sung.com>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:     m.szyprowski@...sung.com, andrzej.hajda@...el.com,
        mchehab@...nel.org, hverkuil-cisco@...all.nl,
        ezequiel@...guardiasur.com.ar, jernej.skrabec@...il.com,
        benjamin.gaignard@...labora.com, krzysztof.kozlowski+dt@...aro.org,
        stanimir.varbanov@...aro.org, dillon.minfei@...il.com,
        david.plowman@...pberrypi.com, mark.rutland@....com,
        robh+dt@...nel.org, krzk+dt@...nel.org, andi@...zian.org,
        alim.akhtar@...sung.com, aswani.reddy@...sung.com,
        pankaj.dubey@...sung.com, smitha.t@...sung.com
Subject: Re: [PATCH 3/3] arm64: dts: exynos: Rename compatible string property
 from version to SOC specific

On 04/11/2022 06:49, Aakarsh Jain wrote:
> 
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski@...aro.org]
>> Sent: 03 November 2022 18:04
>> To: Aakarsh Jain <aakarsh.jain@...sung.com>; linux-arm-
>> kernel@...ts.infradead.org; linux-media@...r.kernel.org; linux-
>> kernel@...r.kernel.org; devicetree@...r.kernel.org
>> Cc: m.szyprowski@...sung.com; andrzej.hajda@...el.com;
>> mchehab@...nel.org; hverkuil-cisco@...all.nl;
>> ezequiel@...guardiasur.com.ar; jernej.skrabec@...il.com;
>> benjamin.gaignard@...labora.com; krzysztof.kozlowski+dt@...aro.org;
>> stanimir.varbanov@...aro.org; dillon.minfei@...il.com;
>> david.plowman@...pberrypi.com; mark.rutland@....com;
>> robh+dt@...nel.org; krzk+dt@...nel.org; andi@...zian.org;
>> alim.akhtar@...sung.com; aswani.reddy@...sung.com;
>> pankaj.dubey@...sung.com; smitha.t@...sung.com
>> Subject: Re: [PATCH 3/3] arm64: dts: exynos: Rename compatible string
>> property from version to SOC specific
>>
>> On 02/11/2022 09:06, Aakarsh Jain wrote:
>>> commit "752d3a23d1f68de87e3c" which adds MFC codec device node for
>>> exynos3250 SOC. Since exynos3250.dtsi and exynos5420.dtsi are using
>>> same compatible string as "samsung,mfc-v7" but their node properties
>>> are different.As both SoCs have MFC v7 hardware module but with
>>> different clock hierarchy and complexity.
>>> So renaming compatible string from version specific to SOC based.
>>>
>>> Suggested-by: Alim Akhtar <alim.akhtar@...sung.com>
>>> Fixes: 752d3a23d1f6 ("ARM: dts: add MFC codec device node for
>>> exynos3250")
>>
>> There is no bug to fix and backporting is forbidden as it breaks the usage of
>> DTS in older kernel.
>>
> Okay will remove this Fix tag in next series.
>>> Signed-off-by: Aakarsh Jain <aakarsh.jain@...sung.com>
>>> ---
>>>  arch/arm/boot/dts/exynos3250.dtsi | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/boot/dts/exynos3250.dtsi
>>> b/arch/arm/boot/dts/exynos3250.dtsi
>>> index 326b9e0ed8d3..98105c64f7d9 100644
>>> --- a/arch/arm/boot/dts/exynos3250.dtsi
>>> +++ b/arch/arm/boot/dts/exynos3250.dtsi
>>> @@ -485,7 +485,7 @@
>>>  		};
>>>
>>>  		mfc: codec@...00000 {
>>> -			compatible = "samsung,mfc-v7";
>>> +			compatible = "samsung,exynos3250-mfc";
>>
>> The change is non-bisectable and breaks using DTS in older kernel.
>>
> Right, so what is your suggestion on this?
> I can see two ways here:
> 1> To squash patch2 and patch3 in one?
> 2> Have a warning about this breakage in the patch-3 commit message?

Here - nothing except implementing bindings. The suggestion was given to
the bindings patch - use fallback.

Best regards,
Krzysztof