linux-kernel - Re: [PATCH 0/8] Generic I2C and SPI register map library

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Message-ID: <4E02FF41.1060000@cam.ac.uk>
Date:	Thu, 23 Jun 2011 09:54:25 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	linux-kernel@...r.kernel.org,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>,
	Samuel Oritz <sameo@...ux.intel.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [PATCH 0/8] Generic I2C and SPI register map library

On 06/23/11 02:25, Mark Brown wrote:
> On Thu, Jun 23, 2011 at 12:48:28AM +0200, torbenh wrote:
> 
>> you should look at SMBus 
>> there seems to be quite some code to share.
>> in particular i2c rtc devices seem to be using SMBus functions
>> to get the exact same semantics you are providing here.
> 
> SMBus is an I2C subset with a definition for 8 bit registers layered
> onto it, pretty much.
> 
>> I just added support for such a device today, and it struck me, that
>> this API was necessary.
> 
> If you're only using SMBus then the I2C interface includes SMBus based
> register support which should do what you want.  With the regmap API it
> ought to work as a device with 8 bit registers and 8 bit values.

The kicker here is that quite a few hosts only support the smbus subset.
How should that be handled here?
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