linux-kernel - Re: [PATCH 1/2] dt-bindings: net: wireless: ath11k: add new DT entry for board ID

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Date:   Tue, 21 Jun 2022 17:58:04 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Robert Marko <robimarko@...il.com>, kvalo@...nel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, ath11k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: net: wireless: ath11k: add new DT entry
 for board ID

On 21/06/2022 15:53, Robert Marko wrote:
> bus + qmi-chip-id + qmi-board-id and optionally the variant are currently
> used for identifying the correct board data file.
> 
> This however is sometimes not enough as all of the IPQ8074 boards that I
> have access to dont have the qmi-board-id properly fused and simply return
> the default value of 0xFF.
> 
> So, to provide the correct qmi-board-id add a new DT property that allows
> the qmi-board-id to be overridden from DTS in cases where its not set.
> This is what vendors have been doing in the stock firmwares that were
> shipped on boards I have.
> 
> Signed-off-by: Robert Marko <robimarko@...il.com>

Thank you for your patch. There is something to discuss/improve.

> ---
>  .../devicetree/bindings/net/wireless/qcom,ath11k.yaml     | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath11k.yaml b/Documentation/devicetree/bindings/net/wireless/qcom,ath11k.yaml
> index a677b056f112..fe6aafdab9d4 100644
> --- a/Documentation/devicetree/bindings/net/wireless/qcom,ath11k.yaml
> +++ b/Documentation/devicetree/bindings/net/wireless/qcom,ath11k.yaml
> @@ -41,6 +41,14 @@ properties:
>          * reg
>          * reg-names
>  
> +  qcom,ath11k-board-id:

The "board" a bit confuses me because in the context of entire system it
means the entire hardware running Qualcomm SoC. This is sometimes
encoded as qcom,board-id property.

Is your property exactly the same?

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Board ID to override the one returned by the firmware or the default
> +      0xff if it was not set by the vendor at all.
> +      It is used along the ath11k-calibration-variant to mach the correct
> +      calibration data from board-2.bin.
> +
>    qcom,ath11k-calibration-variant:
>      $ref: /schemas/types.yaml#/definitions/string
>      description:


Best regards,
Krzysztof