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

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Message-ID: <87o7yeo104.fsf@kernel.org>
Date:   Mon, 27 Jun 2022 13:26:51 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Robert Marko <robimarko@...il.com>
Cc:     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

Robert Marko <robimarko@...il.com> writes:

> 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.

What's wrong with using 0xff? Ie. something like this:

bus=ahb,qmi-chip-id=0,qmi-board-id=255,variant=foo

Or maybe even just skip qmi-board-id entirely if it's not supported? So
that the board file string would be something like:

bus=ahb,qmi-chip-id=0,variant=foo

I really would like to avoid adding more DT properties unless it's
absolutely critical.

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