linux-kernel - Re: [PATCH 16/34] brcmfmac: acpi: Add support for fetching Apple ACPI properties

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Message-ID: <fa19a8d2-f65d-c998-4c84-ae4d7736a681@marcan.st>
Date:   Mon, 3 Jan 2022 15:03:22 +0900
From:   Hector Martin <marcan@...can.st>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@...ineon.com>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Hans de Goede <hdegoede@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        "Daniel (Deognyoun) Kim" <dekim@...adcom.com>,
        "brian m. carlson" <sandals@...stytoothpaste.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com
Subject: Re: [PATCH 16/34] brcmfmac: acpi: Add support for fetching Apple ACPI
 properties

On 2022/01/02 14:58, Linus Walleij wrote:
> On Sun, Dec 26, 2021 at 4:38 PM Hector Martin <marcan@...can.st> wrote:
> 
>> On DT platforms, the module-instance and antenna-sku-info properties
>> are passed in the DT. On ACPI platforms, module-instance is passed via
>> the analogous Apple device property mechanism, while the antenna SKU
>> info is instead obtained via an ACPI method that grabs it from
>> non-volatile storage.
>>
>> Add support for this, to allow proper firmware selection on Apple
>> platforms.
>>
>> Signed-off-by: Hector Martin <marcan@...can.st>
> 
> If the strings treated here are exactly the same as for the device tree,
> you should be able to just use "devprops" (firmware node) to handle it
> abstractly, and then the respective DT and ACPI backend will provide
> the properties.
> 
> I don't know if this patch I made recently is enough of an examples:
> https://lore.kernel.org/linux-hwmon/20211206020423.62402-2-linus.walleij@linaro.org/
> 
> If the ACPI and DT differs a lot in format and strings etc it may not
> be worth it.

It's not quite the same; module-instance is the same from macOS'
perspective, but we don't use Apple's device tree directly but rather
roll our own DT which uses a different property name in this case.
antenna-sku-info uses an ACPI method on x86, so that one is completely
different. So in the end nothing is actually shared.

-- 
Hector Martin (marcan@...can.st)
Public Key: https://mrcn.st/pub