linux-kernel - Re: [RFC PATCH v2 2/6] i2c: allow DT nodes without 'compatible'

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Message-ID: <11ca7487-ac07-f714-8573-20d1a0040212@lucaceresoli.net>
Date:   Fri, 10 Apr 2020 15:49:33 +0200
From:   Luca Ceresoli <luca@...aceresoli.net>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-i2c@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org, linux-i3c@...ts.infradead.org,
        Kieran Bingham <kieran@...uared.org.uk>,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh@...nel.org>
Subject: Re: [RFC PATCH v2 2/6] i2c: allow DT nodes without 'compatible'

Hi,

On 18/03/20 16:00, Wolfram Sang wrote:
> Sometimes, we have unknown devices in a system and still want to block
> their address. For that, we allow DT nodes with only a 'reg' property.
> These devices will be bound to the "dummy" driver but with the name
> "reserved". That way, we can distinguish them and even hand them over to
> the "dummy" driver later when they are really requested using
> i2c_new_ancillary_device().
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Acked-by: Rob Herring <robh@...nel.org>

Reviewed-by: Luca Ceresoli <luca@...aceresoli.net>

As I said in the reply to v1, I think we should reserve addresses also
when there is a compatible string but no matching driver, but this is
another story and can be handled separately.

-- 
Luca