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Date:   Wed, 15 Apr 2020 09:59:11 +0200
From:   Wolfram Sang <wsa@the-dreams.de>
To:     Luca Ceresoli <luca@lucaceresoli.net>
Cc:     Wolfram Sang <wsa+renesas@sang-engineering.com>,
        linux-i2c@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
        linux-i3c@lists.infradead.org,
        Kieran Bingham <kieran@ksquared.org.uk>,
        Niklas =?utf-8?Q?S=C3=B6derlund?= <niklas.soderlund@ragnatech.se>,
        Jacopo Mondi <jacopo@jmondi.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Vladimir Zapolskiy <vz@mleia.com>,
        linux-kernel@vger.kernel.org,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Rob Herring <robh@kernel.org>
Subject: Re: [RFC PATCH v2 2/6] i2c: allow DT nodes without 'compatible'
Message-ID: <20200415075911.GA1141@ninjato>
References: <20200318150059.21714-1-wsa+renesas@sang-engineering.com>
 <20200318150059.21714-3-wsa+renesas@sang-engineering.com>
 <11ca7487-ac07-f714-8573-20d1a0040212@lucaceresoli.net>
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> 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.

Unless I misunderstand you, I think they do already. Note that
only 'i2cdetect' shows a device as busy *IFF* there is a driver bound to
it. The internal 'i2c_check_addr_busy' does not care about a driver
being bound. You can check this by trying to use
i2c_new_ancillary_device() with an address which is already described in
DT but which driver is disabled.


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