linux-kernel - Re: [PATCH 1/2] dt-bindings: rtc: stm32: introduce new st,stm32mp25-rtc compatible

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Message-ID: <20240611-sample-remold-a75d6f6515d8@spud>
Date: Tue, 11 Jun 2024 19:16:24 +0100
From: Conor Dooley <conor@...nel.org>
To: Valentin Caron <valentin.caron@...s.st.com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: rtc: stm32: introduce new
 st,stm32mp25-rtc compatible

On Tue, Jun 11, 2024 at 06:19:57PM +0200, Valentin Caron wrote:
> Introduce new st,stm32mp25-rtc compatible. It is based on st,stm32mp1-rtc.
> 
> Difference is that stm32mp25 SoC implements a triple protection on RTC
> registers:
> - Secure bit based protection
> - Privileged context based protection
> - Compartment ID filtering based protection
> This driver will now check theses configurations before probing to avoid
> exceptions and fake reads on register.
> 
> Link: https://www.st.com/resource/en/reference_manual/rm0457-stm32mp25xx-advanced-armbased-3264bit-mpus-stmicroelectronics.pdf#page=4081
> Signed-off-by: Valentin Caron <valentin.caron@...s.st.com>
> ---
>  Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
> index 4703083d1f11f..65a8a93ef5753 100644
> --- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
> +++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
> @@ -15,6 +15,7 @@ properties:
>        - st,stm32-rtc
>        - st,stm32h7-rtc
>        - st,stm32mp1-rtc
> +      - st,stm32mp25-rtc
>  
>    reg:
>      maxItems: 1
> @@ -90,7 +91,9 @@ allOf:
>        properties:
>          compatible:
>            contains:
> -            const: st,stm32mp1-rtc
> +            anyOf:
> +              - const: st,stm32mp1-rtc

anyOf:
  - const: foo
  - const: bar

is just the same as using
enum:
  - foo
  - bar

Thanks,
Conor.

> +              - const: st,stm32mp25-rtc
>  
>      then:
>        properties:
> -- 
> 2.25.1
> 

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