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Date: Tue, 25 Oct 2011 09:14:18 +0200
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Kyle Manna <kyle.manna@fuel7.com>
Cc: linux-kernel@vger.kernel.org, Samuel Ortiz <sameo@linux.intel.com>,
        Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>,
        Liam Girdwood <lrg@ti.com>
Subject: Re: [PATCH v2 1/6] mfd: TPS65910: Handle non-existent devices
Message-ID: <20111025071417.GE2919@opensource.wolfsonmicro.com>
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On Mon, Oct 24, 2011 at 12:05:59PM -0500, Kyle Manna wrote:
> Attempt to read the first register of the device, if there is no
> device return -ENODEV

Can you check for a known value in any of the registers?