linux-kernel - Re: [PATCH 1/5] dt-bindings: samsung: exynos-sysreg: add exynos7870 sysregs

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Message-ID: <cd0f942a3752053e7569040f9e508b2d@disroot.org>
Date: Wed, 18 Jun 2025 14:49:36 +0000
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] dt-bindings: samsung: exynos-sysreg: add exynos7870
 sysregs

On 2025-06-18 14:37, Krzysztof Kozlowski wrote:
> On 18/06/2025 16:32, Kaustabh Chakraborty wrote:
>> On 2025-06-18 09:46, Krzysztof Kozlowski wrote:
>>> On 12/06/2025 17:23, Kaustabh Chakraborty wrote:
>>>> Add sysreg compatible strings for the Exynos7870 SoC. Two sysregs 
>>>> are
>>>> added, used for the SoC MIPI PHY's CSIS and DSIM blocks.
>>>> 
>>>> Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
>>>> ---
>>>>  .../devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml      
>>>> | 6 ++++++
>>>>  1 file changed, 6 insertions(+)
>>>> 
>>>> diff --git 
>>>> a/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml 
>>>> b/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml
>>>> index 
>>>> d27ed6c9d61ea9db77229eca60b6b9a0abc5d305..174bdb8ee932ff965de6fc17aef004a3cedffeb3 
>>>> 100644
>>>> --- 
>>>> a/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml
>>>> +++ 
>>>> b/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml
>>>> @@ -52,6 +52,12 @@ properties:
>>>>                - samsung,exynosautov9-sysreg
>>>>            - const: syscon
>>>>          deprecated: true
>>>> +      - items:
>>>> +          - enum:
>>>> +              - samsung,exynos7870-cam-sysreg
>>>> +              - samsung,exynos7870-disp-sysreg
>>>> +          - const: samsung,exynos7870-sysreg
>>> 
>>> 
>>> Drop. These are not really compatible or your commit msg is 
>>> incomplete.
>>> Don't use deprecated syntax and backwards compatible solutions for 
>>> new
>>> hardware.
>> 
>> Are you sure? The deprecated one is actually the item above. From what 
>> I
> 
> Yes. Think why were they added.
> 
>> understand, those are generic sysregs and don't mention their 
>> functions.
> 
> And what is a generic sysreg?

What I meant is, usually compatibles go like this (in order):

"samsung,exynos<soc>-<function>-sysreg", "samsung,exynos<soc>-sysreg", 
"syscon"

But the deprecated item had its compatibles like this:

"samsung,exynos<soc>-sysreg", "syscon"

That is what I meant by "generic". It doesn't mention <function>.

And my additions adhere to the former. So does [1], [2], and [3]. None 
are
deprecated.

[1] 
https://elixir.bootlin.com/linux/v6.15.2/source/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml#L40
[2] 
https://elixir.bootlin.com/linux/v6.15.2/source/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml#L55
[3] 
https://elixir.bootlin.com/linux/v6.15.2/source/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml#L61

> 
> Best regards,
> Krzysztof