linux-kernel - Re: [RFC 02/10] property: add fwnode_get_match

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Date:   Tue, 22 Feb 2022 09:33:32 +0100
From:   Andy Shevchenko <andy.shevchenko@...il.com>
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>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [RFC 02/10] property: add fwnode_get_match_data()

On Tue, Feb 22, 2022 at 9:24 AM Clément Léger <clement.leger@...tlin.com> wrote:
> Le Mon, 21 Feb 2022 19:46:12 +0200,
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com> a écrit :
> > On Mon, Feb 21, 2022 at 05:26:44PM +0100, Clément Léger wrote:

...

> > It's OF-centric API, why it has fwnode prefix? Can it leave in drivers/of instead?
>
> The idea is to allow device with a software_node description to match
> with the content of the of_match_table. Without this, we would need a
> new type of match table that would probably duplicates part of the
> of_match_table to be able to match software_node against a driver.
> I did not found an other way to do it without modifying drivers
> individually to support software_nodes.

software nodes should not be used as a replacement of the real
firmware nodes. The idea behind is to fill the gaps in the cases when
firmware doesn't provide enough information to the OS. I think Heikki
can confirm or correct me.

If you want to use the device on an ACPI based platform, you need to
describe it in ACPI as much as possible. The rest we may discuss.

-- 
With Best Regards,
Andy Shevchenko