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

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Message-ID: <e620b07d-e53e-edae-1078-2a776abf1e17@marcan.st>
Date:   Thu, 22 Sep 2022 22:08:19 +0900
From:   Hector Martin <marcan@...can.st>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     ~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 22/09/2022 22.02, Linus Walleij wrote:
> 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?

I don't think the firmware is signed, they probably just don't want to
share the source code with most customers? (Except Apple maybe, but
Apple gets custom silicon too...).

- Hector