linux-kernel - Re: [RFC 09/10] i2c: mux: add support for fwnode

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Message-ID: <20220222095325.52419021@fixe.home>
Date:   Tue, 22 Feb 2022 09:53:25 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     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>,
        Andrew Lunn <andrew@...n.ch>,
        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 09/10] i2c: mux: add support for fwnode

Le Mon, 21 Feb 2022 19:55:25 +0200,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> a écrit :

> On Mon, Feb 21, 2022 at 05:26:51PM +0100, Clément Léger wrote:
> > Modify i2c_mux_add_adapter() to use with fwnode API to allow creating
> > mux adapters with fwnode based devices. This allows to have a node
> > independent support for i2c muxes.  
> 
> I^2C muxes have their own description for DT and ACPI platforms, I'm not sure
> swnode should be used here at all. Just upload a corresponding SSDT overlay or
> DT overlay depending on the platform. Can it be achieved?
> 

Problem is that this PCIe card can be plugged either in a X86 platform
using ACPI or on a ARM one with device-tree. So it means I should have
two "identical" descriptions for each platforms.

-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com