netdev - Re: [PATCH net-next 1/3] dt-bindings: net: qcom,ipa: make imem interconnect optional

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Date:   Fri, 23 Jul 2021 14:52:52 -0600
From:   Rob Herring <robh@...nel.org>
To:     Alex Elder <elder@...aro.org>
Cc:     bjorn.andersson@...aro.org, agross@...nel.org, davem@...emloft.net,
        kuba@...nel.org, evgreen@...omium.org, cpratapa@...eaurora.org,
        subashab@...eaurora.org, elder@...nel.org,
        linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/3] dt-bindings: net: qcom,ipa: make imem
 interconnect optional

On Mon, Jul 19, 2021 at 04:24:54PM -0500, Alex Elder wrote:
> On some newer SoCs, the interconnect between IPA and SoC internal
> memory (imem) is not used.  Reflect this in the binding by moving
> the definition of the "imem" interconnect to the end and defining
> minItems to be 2 for both the interconnects and interconnect-names
> properties.
> 
> Signed-off-by: Alex Elder <elder@...aro.org>
> ---
>  .../devicetree/bindings/net/qcom,ipa.yaml      | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/qcom,ipa.yaml b/Documentation/devicetree/bindings/net/qcom,ipa.yaml
> index ed88ba4b94df5..4853ab7017bd9 100644
> --- a/Documentation/devicetree/bindings/net/qcom,ipa.yaml
> +++ b/Documentation/devicetree/bindings/net/qcom,ipa.yaml
> @@ -87,16 +87,18 @@ properties:
>        - const: ipa-setup-ready
>  
>    interconnects:
> +    minItems: 2
>      items:
> -      - description: Interconnect path between IPA and main memory
> -      - description: Interconnect path between IPA and internal memory
> -      - description: Interconnect path between IPA and the AP subsystem
> +      - description: Path leading to system memory
> +      - description: Path between the AP and IPA config space
> +      - description: Path leading to internal memory
>  
>    interconnect-names:
> +    minItems: 2
>      items:
>        - const: memory
> -      - const: imem
>        - const: config
> +      - const: imem

What about existing users? This will generate warnings. Doing this for 
the 2nd item would avoid the need for .dts updates:

- enum: [ imem, config ]

Rob