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

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Date:	Thu, 30 Jun 2011 18:14:52 +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 18:07, Liam Girdwood wrote:
> 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.  
> 

Forgot this.

Acked-by: Liam Girdwood <lrg@...com>

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