linux-kernel - Re: [PATCH v3 2/2] i2c: i2c-mux-gpio: Enable this driver in ACPI land

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Message-ID: <CAHp75VfsM+ysz_tr_h0rJpspcZAToiV+H5KDCi7J=LCEO0sFxQ@mail.gmail.com>
Date:   Sun, 18 Oct 2020 21:58:23 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Evan Green <evgreen@...omium.org>
Cc:     Peter Rosin <peda@...ntia.se>, Wolfram Sang <wsa@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Peter Korsgaard <peter.korsgaard@...co.com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] i2c: i2c-mux-gpio: Enable this driver in ACPI land

On Sat, Oct 17, 2020 at 8:30 AM Evan Green <evgreen@...omium.org> wrote:
>
> Enable i2c-mux-gpio devices to be defined via ACPI. The idle-state
> property translates directly to a fwnode_property_*() call. The child
> reg property translates naturally into _ADR in ACPI.
>
> The i2c-parent binding is a relic from the days when the bindings
> dictated that all direct children of an I2C controller had to be I2C
> devices. These days that's no longer required. The i2c-mux can sit as a
> direct child of its parent controller, which is where it makes the most
> sense from a hardware description perspective. For the ACPI
> implementation we'll assume that's always how the i2c-mux-gpio is
> instantiated.

Can you tell me if the following is relevant to what you are looking for?
https://elixir.bootlin.com/linux/latest/source/drivers/i2c/i2c-mux.c#L393

-- 
With Best Regards,
Andy Shevchenko