linux-kernel - Re: [PATCH v3 1/2] dt-bindings: remoteproc: ti: Add new compatible for AM62 SoC family

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Message-ID: <374d0b5c-55f4-ee30-c804-4488a3fedb48@linaro.org>
Date:   Mon, 26 Dec 2022 13:18:26 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Devarsh Thakkar <devarsht@...com>, andersson@...nel.org,
        devicetree@...r.kernel.org, mathieu.poirier@...aro.org,
        p.zabel@...gutronix.de, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, s-anna@...com
Cc:     hnagalla@...com, praneeth@...com, nm@...com, vigneshr@...com,
        a-bhatia1@...com, j-luthra@...com
Subject: Re: [PATCH v3 1/2] dt-bindings: remoteproc: ti: Add new compatible
 for AM62 SoC family

On 23/12/2022 12:56, Devarsh Thakkar wrote:
> AM62 family of devices don't have a R5F cluster, instead
> they have single core DM R5F.
> Add new compatible string ti,am62-r5fss to support this scenario.
> 
> When this new compatible is used don't allow cluster-mode
> property usage in device-tree as this implies that there
> is no R5F cluster available and only single R5F core
> is present.
> 
> Signed-off-by: Devarsh Thakkar <devarsht@...com>
> ---
> V2: Avoid acronyms, use "Device Manager" instead of "DM"
> V3:
> - Use separate if block for each compatible for ti,cluster-mode property
> - Rearrange compatibles as per alphabatical order
> ---
>  .../bindings/remoteproc/ti,k3-r5f-rproc.yaml  | 68 +++++++++++++------
>  1 file changed, 47 insertions(+), 21 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/ti,k3-r5f-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/ti,k3-r5f-rproc.yaml
> index fb9605f0655b..e8a861179bd9 100644
> --- a/Documentation/devicetree/bindings/remoteproc/ti,k3-r5f-rproc.yaml
> +++ b/Documentation/devicetree/bindings/remoteproc/ti,k3-r5f-rproc.yaml
> @@ -21,6 +21,9 @@ description: |
>    called "Single-CPU" mode, where only Core0 is used, but with ability to use
>    Core1's TCMs as well.
>  
> +  AM62 SoC family support a single R5F core only which runs Device Manager
> +  firmware and can also be used as a remote processor with IPC communication.
> +
>    Each Dual-Core R5F sub-system is represented as a single DTS node
>    representing the cluster, with a pair of child DT nodes representing
>    the individual R5F cores. Each node has a number of required or optional
> @@ -28,16 +31,20 @@ description: |
>    the device management of the remote processor and to communicate with the
>    remote processor.
>  
> +  Since AM62 SoC family only support a single core, there is no cluster-mode
> +  property setting required for it.
> +
>  properties:
>    $nodename:
>      pattern: "^r5fss(@.*)?"
>  
>    compatible:
>      enum:
> +      - ti,am62-r5fss
> +      - ti,am64-r5fss
>        - ti,am654-r5fss
> -      - ti,j721e-r5fss
>        - ti,j7200-r5fss
> -      - ti,am64-r5fss
> +      - ti,j721e-r5fss
>        - ti,j721s2-r5fss
>  
>    power-domains:
> @@ -80,7 +87,9 @@ patternProperties:
>        node representing a TI instantiation of the Arm Cortex R5F core. There
>        are some specific integration differences for the IP like the usage of
>        a Region Address Translator (RAT) for translating the larger SoC bus
> -      addresses into a 32-bit address space for the processor.
> +      addresses into a 32-bit address space for the processor. For AM62x,
> +      the R5F Sub-System device node should only define one R5F child node
> +      as it has only one core available.
>  
>        Each R5F core has an associated 64 KB of Tightly-Coupled Memory (TCM)
>        internal memories split between two banks - TCMA and TCMB (further
> @@ -100,11 +109,12 @@ patternProperties:
>      properties:
>        compatible:
>          enum:
> -          - ti,am654-r5f
> -          - ti,j721e-r5f
> -          - ti,j7200-r5f
> -          - ti,am64-r5f
> -          - ti,j721s2-r5f
> +          - ti,am62-r5fss
> +          - ti,am64-r5fss
> +          - ti,am654-r5fss
> +          - ti,j7200-r5fss
> +          - ti,j721e-r5fss
> +          - ti,j721s2-r5fss
>  
>        reg:
>          items:
> @@ -208,19 +218,35 @@ patternProperties:
>  
>      unevaluatedProperties: false
>  
> -if:
> -  properties:
> -    compatible:
> -      enum:
> -        - ti,am64-r5fss
> -then:
> -  properties:
> -    ti,cluster-mode:
> -      enum: [0, 2]
> -else:
> -  properties:
> -    ti,cluster-mode:
> -      enum: [0, 1]
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - ti,am64-r5fss
> +    then:
> +      properties:
> +        ti,cluster-mode:
> +          enum: [0, 2]
> +
> +  - if:
> +      properties:
> +        compatible:
> +          enum: ["ti,am654-r5fss", "ti,j7200-r5fss", "ti,j721e-r5fss",  "ti,j721s2-r5fss"]

That's not how enums are spelled for such cases. Git grep for examples -
this should be a enum with each item in new entry, no quotes.

Best regards,
Krzysztof