linux-kernel - Re: [PATCH v2] brcmfmac: Add support for BCM43596 PCIe Wi-Fi

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Date:   Thu, 22 Sep 2022 15:02:12 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     Hector Martin <marcan@...can.st>,
        ~postmarketos/upstreaming@...ts.sr.ht, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Marek Vasut <marex@...x.de>,
        "Zhao, Jiaqing" <jiaqing.zhao@...el.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Soontak Lee <soontak.lee@...ress.com>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] brcmfmac: Add support for BCM43596 PCIe Wi-Fi

On Thu, Sep 22, 2022 at 12:21 PM Konrad Dybcio
<konrad.dybcio@...ainline.org> wrote:

> Also worth noting is the 'somc' bit, meaning there are probably *some* SONY
> customizations, but that's also just a guess.

What I have seen from BRCM customizations on Samsung phones is that
the per-device customization of firmware seems to involve the set-up of
some GPIO and power management pins. For example if integrated with
an SoC that has autonomous system resume, or if some GPIO line has
to be pulled to enable an external regulator or PA.

To the best of my knowledge that customization is done by consultants
from Broadcom when working with the device manufacturer, and
eventually they roll a unique firmware for the device. Probably because
the firmware can only be signed for execution by Broadcom?

Yours,
Linus Walleij