linux-kernel - Re: [PATCH 1/5] dt-bindings: arm: keystone: add ti,j7200-sci compatible

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Message-ID: <83814027-12a1-4273-9d2d-400739bc3b64@ti.com>
Date:   Wed, 29 Nov 2023 09:54:57 -0600
From:   Andrew Davis <afd@...com>
To:     Thomas Richard <thomas.richard@...tlin.com>,
        Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <thomas.petazzoni@...tlin.com>, <gregory.clement@...tlin.com>,
        <u-kumar1@...com>
Subject: Re: [PATCH 1/5] dt-bindings: arm: keystone: add ti,j7200-sci
 compatible

On 11/29/23 9:31 AM, Thomas Richard wrote:
> On j7200, during suspend to ram the soc is powered-off.
> At resume requested irqs shall be restored which is a different behavior
> from other platforms.

Why is J7200 different? All K3 can/will support off mode suspend
to RAM. The only difference is you are adding support for it to this
one SoC first. You are describing a software behavior, not hardware.
Using a compatible to describe if a SW feature is enabled is not a
correct use of DT.

Andrew

> 
> Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
> ---
>   Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
> index c24ad0968f3e..53d9c58dcd70 100644
> --- a/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
> +++ b/Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml
> @@ -40,6 +40,8 @@ properties:
>         - description: System controller on TI AM654 SoC
>           items:
>             - const: ti,am654-sci
> +      - description: System controller on TI J7200 SOC
> +          - const: ti,j7200-sci
>   
>     reg-names:
>       description: |
>