linux-kernel - Re: [RFC 10/10] net: sfp: add support for fwnode

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Message-ID: <d7c8a9fe-5c9b-2c9d-3731-c735da795bf8@redhat.com>
Date:   Wed, 23 Feb 2022 16:27:33 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Clément Léger <clement.leger@...tlin.com>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        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>,
        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 10/10] net: sfp: add support for fwnode

Hi,

On 2/23/22 16:23, Andrew Lunn wrote:
>> As Russell asked, I'm also really interested if someone has a solution
>> to reuse device-tree description (overlays ?) to describe such
>> hardware. However, the fact that CONFIG_OF isn't enabled on x86 config
>> seems a bit complicated on this side.
> 
> It does work, intel even used it for one of there tiny x86 SoCs. Maybe
> it was Newton?

IIRC those SoCs did not use standard EFI/ACPI though, but rather some
other special firmware, I think it was SFI ?  This is not so much about
the CPU architecture as it is about the firmware/bootloader <->
OS interface.

Note I'm not saying this can not be done with EFI/ACPI systems, but
I think it has never been tried.

Regards,

Hans