linux-kernel - Re: [PATCH v3 1/2] dt-bindings: arm: Add OP-TEE transport for SCMI

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Message-ID: <YW2xhRXQ+MA/Cxm1@robh.at.kernel.org>
Date:   Mon, 18 Oct 2021 12:40:21 -0500
From:   Rob Herring <robh@...nel.org>
To:     Etienne Carriere <etienne.carriere@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: arm: Add OP-TEE transport for SCMI

On Mon, Oct 18, 2021 at 01:40:45PM +0200, Etienne Carriere wrote:
> Introduce compatible "linaro,scmi-optee" for SCMI transport channel
> based on an OP-TEE service invocation. The compatible mandates a
> channel ID defined with property "linaro,optee-channel-id".
> 
> Cc: devicetree@...r.kernel.org
> Cc: Rob Herring <robh+dt@...nel.org>
> Signed-off-by: Etienne Carriere <etienne.carriere@...aro.org>
> ---
> Changes since v2:
>  - Define mandatory property linaro,optee-channel-id
>  - Rebased on yaml description file
> 
> Changes since v1:
>  - Removed modification regarding mboxes property description.
> ---
>  .../bindings/firmware/arm,scmi.yaml           | 44 +++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> index 5c4c6782e052..12154ecc081b 100644
> --- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> +++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> @@ -38,6 +38,9 @@ properties:
>                       The virtio transport only supports a single device.
>          items:
>            - const: arm,scmi-virtio
> +      - description: SCMI compliant firmware with OP-TEE transport
> +        items:
> +          - const: linaro,scmi-optee
>  
>    interrupts:
>      description:
> @@ -83,6 +86,11 @@ properties:
>      description:
>        SMC id required when using smc or hvc transports
>  
> +  linaro,optee-channel-id:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Channel id required when using OP-TEE transports
> +
>    protocol@11:
>      type: object
>      properties:
> @@ -195,6 +203,9 @@ patternProperties:
>          minItems: 1
>          maxItems: 2
>  
> +      linaro,optee-channel-id:
> +        maxItems: 1

Why is the same property in 2 different spots? That doesn't seem ideal.

Unfortunately, you have to duplicate the definition.

> +
>      required:
>        - reg
>  
> @@ -226,6 +237,16 @@ else:
>        - arm,smc-id
>        - shmem
>  
> +  else:
> +    if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: linaro,scmi-optee
> +    then:
> +      required:
> +        - linaro,optee-channel-id
> +
>  examples:
>    - |
>      firmware {
> @@ -340,7 +361,30 @@ examples:
>                  reg = <0x11>;
>                  #power-domain-cells = <1>;
>              };
> +        };
> +    };
> +
> +  - |
> +    firmware {
> +        scmi {
> +            compatible = "linaro,scmi-optee";
> +            linaro,optee-channel = <0>;
> +
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            scmi_clk: protocol@14 {
> +                reg = <0x14>;
> +                #clock-cells = <1>;
> +            };
> +
> +            scmi_dvfs: protocol@13 {
> +                reg = <0x13>;
>  
> +                #clock-cells = <1>;
> +                linaro,optee-channel = <1>;
> +                shmem = <&cpu_scp_hpri0>;
> +            };
>          };
>      };
>  
> -- 
> 2.17.1
> 
>