linux-kernel - Re: [PATCH V3 1/2] dt-bindings: firmware: qcom-scm: Add optional interrupt

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Date:   Tue, 18 Oct 2022 13:11:12 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sibi Sankar <quic_sibis@...cinc.com>, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org
Cc:     agross@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        konrad.dybcio@...ainline.org, robimarko@...il.com,
        quic_gurus@...cinc.com, quic_rjendra@...cinc.com
Subject: Re: [PATCH V3 1/2] dt-bindings: firmware: qcom-scm: Add optional
 interrupt

On 18/10/2022 05:46, Sibi Sankar wrote:
> From: Guru Das Srinagesh <quic_gurus@...cinc.com>
> 
> Add an interrupt specification to the bindings to support the wait-queue
> feature.
> 
> Signed-off-by: Guru Das Srinagesh <quic_gurus@...cinc.com>
> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
> ---
> 
> The interrupt property for scm firmware from a binding perspective is
> completely optional i.e. not all tz fw running in the wild on sm8450
> devices support this feature. The bootloader does the interrupt property
> addition on sm8450 devices with wait-queue support.
> 
>  Documentation/devicetree/bindings/firmware/qcom,scm.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
> index c5b76c9f7ad0..6483d76b2371 100644
> --- a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
> +++ b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml
> @@ -71,6 +71,11 @@ properties:
>    '#reset-cells':
>      const: 1
>  
> +  interrupts:
> +    description:
> +      The wait-queue interrupt that firmware raises as part of handshake
> +      protocol to handle sleeping SCM calls.

You still miss here constraints... nothing improved. Just look at other
properties in this file.

maxItems:1

Best regards,
Krzysztof