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

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Date:	Thu, 30 Jun 2011 18:07:19 +0100
From:	Liam Girdwood <lrg@...com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Samuel Oritz <sameo@...ux.intel.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Graeme Gregory <gg@...mlogic.co.uk>
Subject: Re: [PATCH 0/8] regmap: Generic I2C and SPI register map library

On 30/06/11 06:58, Mark Brown wrote:
> [This revision of the series has some minor updates to the SPI code.]
> 
> Many I2C and SPI based devices implement register maps on top of the raw
> wire interface.  This is generally done in a very standard fashion by
> devices, resulting in a lot of very similar code in drivers.  For some
> time now ASoC has factored this code out into the subsystem but that's
> only useful for audio devices.  The intention with this series is to
> generalise the concept so that it can be used throughout the kernel.
> 
> It's not intended that this be suitable for all devices - some devices
> have things that are hard to generalise like registers with variable
> size and paging which are hard to support genericly.  At the minute the
> code is focused on the common cases.  It is likely that the same code
> could be used with other buses with similar properties to I2C and SPI.
> 
> Currently only physical I/O is handled, the intention is that once this
> support has been reviewed and merged the generic register cache code
> that ASoC includes will also be factored out too.  For devices with read
> heavy workloads (especially those that need a lot of read/modify/write
> cycles) or which don't support read at all this can provide a useful
> performance improvement and for sparse register maps there's a lot of
> benefit in relatively complex cache code.
> 
> I'm not entirely happy with the implementation currently but am fairly
> happy with the external interfaces.
> 

I'm also happy with the interface and imho the code looks fine for initial integration.  

Regards

Liam
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