linux-kernel - Re: [PATCH v2 1/6] mfd: TPS65910: Handle non-existent devices

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Message-ID: <4EA6D14D.6060800@fuel7.com>
Date:	Tue, 25 Oct 2011 10:10:05 -0500
From:	Kyle Manna <kyle.manna@...l7.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Jorge Eduardo Candelaria <jedu@...mlogic.co.uk>,
	Liam Girdwood <lrg@...com>
Subject: Re: [PATCH v2 1/6] mfd: TPS65910: Handle non-existent devices

On 10/25/2011 02:14 AM, Mark Brown wrote:
> 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?
Unfortunately on this chip there aren't any identification or constant 
test registers.  The only register close is the JTAGVERNUM_REG and 
that's will change across silicon revisions.

- Kyle
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