linux-kernel - Re: [PATCH RFC 1/2] dt-bindings: soc: qcom,smsm: Allow specifying mboxes instead of qcom,ipc

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Message-ID: <20240425161715.GA2759240-robh@kernel.org>
Date: Thu, 25 Apr 2024 11:17:15 -0500
From: Rob Herring <robh@...nel.org>
To: Luca Weiss <luca@...tu.xyz>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Andy Gross <agross@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/2] dt-bindings: soc: qcom,smsm: Allow specifying
 mboxes instead of qcom,ipc

On Wed, Apr 24, 2024 at 07:21:51PM +0200, Luca Weiss wrote:
> The qcom,ipc-N properties are essentially providing a reference to a
> mailbox, so allow using the mboxes property to do the same in a more
> structured way.

Can we mark qcom,ipc-N as deprecated then?
 
> Since multiple SMSM hosts are supported, we need to be able to provide
> the correct mailbox for each host. The old qcom,ipc-N properties map to
> the mboxes property by index, starting at 0 since that's a valid SMSM
> host also.
> 
> The new example shows how an smsm node with just qcom,ipc-3 should be
> specified with the mboxes property.
> 
> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> ---
>  .../devicetree/bindings/soc/qcom/qcom,smsm.yaml    | 48 ++++++++++++++++++----
>  1 file changed, 40 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smsm.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,smsm.yaml
> index db67cf043256..b12589171169 100644
> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,smsm.yaml
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smsm.yaml
> @@ -33,6 +33,13 @@ properties:
>        specifier of the column in the subscription matrix representing the local
>        processor.
>  
> +  mboxes:
> +    minItems: 1
> +    maxItems: 5

Need to define what each entry is.

> +    description:
> +      Reference to the mailbox representing the outgoing doorbell in APCS for
> +      this client.
> +
>    '#size-cells':
>      const: 0
>  
> @@ -98,15 +105,18 @@ required:
>    - '#address-cells'
>    - '#size-cells'
>  
> -anyOf:
> +oneOf:
>    - required:
> -      - qcom,ipc-1
> -  - required:
> -      - qcom,ipc-2
> -  - required:
> -      - qcom,ipc-3
> -  - required:
> -      - qcom,ipc-4
> +      - mboxes
> +  - anyOf:
> +      - required:
> +          - qcom,ipc-1
> +      - required:
> +          - qcom,ipc-2
> +      - required:
> +          - qcom,ipc-3
> +      - required:
> +          - qcom,ipc-4
>  
>  additionalProperties: false
>  
> @@ -136,3 +146,25 @@ examples:
>              #interrupt-cells = <2>;
>          };
>      };
> +  # Example using mboxes property
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    shared-memory {
> +        compatible = "qcom,smsm";
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        mboxes = <0>, <0>, <0>, <&apcs 19>;
> +
> +        apps@0 {
> +            reg = <0>;
> +            #qcom,smem-state-cells = <1>;
> +        };
> +
> +        wcnss@7 {
> +            reg = <7>;
> +            interrupts = <GIC_SPI 144 IRQ_TYPE_EDGE_RISING>;
> +            interrupt-controller;
> +            #interrupt-cells = <2>;
> +        };
> +    };
> 
> -- 
> 2.44.0
>