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

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Date:   Thu, 23 Jun 2022 22:16:38 +0200
From:   Robert Marko <robimarko@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Kalle Valo <kvalo@...nel.org>, davem@...emloft.net,
        Eric Dumazet <edumazet@...gle.com>, kuba@...nel.org,
        pabeni@...hat.com, Rob Herring <robh+dt@...nel.org>,
        krzysztof.kozlowski+dt@...aro.org, ath11k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Devicetree List <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: net: wireless: ath11k: add new DT entry
 for board ID

On Wed, 22 Jun 2022 at 16:55, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 21/06/2022 20:47, Robert Marko wrote:
> > On Tue, 21 Jun 2022 at 17:58, Krzysztof Kozlowski
> > <krzysztof.kozlowski@...aro.org> wrote:
> >>
> >> 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.
> >
> > Hi Krzysztof,
> > I agree that the name is a bit confusing, it's not the same as
> > qcom,board-id AFAIK
> > and QCA as well as vendors are using a similar property in the wifi
> > node to override
> > the default qmi-board-id to the correct one as its rarely properly fused.
> >
> > I assume it would be better-called qcom,ath11k-qmi-board-id as you
> > dont even have
> > to be using a Qualcomm SoC as the same is used by PCI ath11k cards as well.
> >
>
> Thanks for the explanation. What is the "board" in that context? The
> card/hardware with ath11k? Then maybe qcom,ath11k-qmi-id or
> qcom,ath11k-qmi-hw-id?

Hi,

I assume it started off as a numerical value to match the board design and was
then simply carried off to the PCI cards as well.

qcom,ath11k-qmi-hw-id is fine by me, will just expand the description to make
it clear.

Regards,
Robert

>
> Best regards,
> Krzysztof