linux-kernel - Re: [RFC 00/10] add support for fwnode in i2c mux system and sfp

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Message-ID: <YhQHqDJvahgriDZK@lunn.ch>
Date:   Mon, 21 Feb 2022 22:44:08 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Clément Léger <clement.leger@...tlin.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Wolfram Sang <wsa@...nel.org>, Peter Rosin <peda@...ntia.se>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-i2c@...r.kernel.org,
        netdev@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [RFC 00/10] add support for fwnode in i2c mux system and sfp

> This series has been tested on a x86 kernel build without CONFIG_OF.
> Another kernel was also built with COMPILE_TEST and CONFIG_OF support
> to build as most drivers as possible. It was also tested on a sparx5
> arm64 with CONFIG_OF. However, it was not tested with an ACPI
> description evolved enough to validate all the changes.

By that, do you mean a DSD description?

In the DT world, we avoid snow flakes. Once you define a binding, it
is expected every following board will use it. So what i believe you
are doing here is defining how i2c muxes are described in APCI. How
SFP devices are described in ACPI. Until the ACPI standards committee
says otherwise, this is it. So you need to clearly document
this. Please add to Documentation/firmware-guide/acpi/dsd.

      Andrew