[alsa-devel] [PATCH] ALSA: ASoC: add codec driver for TI TAS5086

Daniel Mack zonque at gmail.com
Wed May 22 19:55:22 CEST 2013

On 22.05.2013 19:50, jonsmirl at gmail.com wrote:
> On Fri, Mar 8, 2013 at 6:07 AM, Daniel Mack <zonque at gmail.com> wrote:
>> This patch adds a driver for TI's TA5086 6-channel PWM processor.
>> This chip has a very unusual register layout, specifically because the
>> registers are of unequal size, and multi-byte registers require bulk
>> writes to take effect. Regmap does not support these kind of mappings.
>> Currently, the driver does not touch any of the registers >= 0x20, so
>> it doesn't matter, because the register map is mapped to an 8-bit array.
>> In case more features will be added in the future that require access
>> to higher registers, the entire regmap H/W I/O routines have to be
>> open-coded.
> Check out my tas5504 driver from a long time ago. It dealt with those registers.
> https://github.com/jonsmirl/mpc5200/blob/master/sound/soc/codecs/tas5504.c
> https://github.com/jonsmirl/mpc5200/blob/master/sound/soc/codecs/tas5504.h

Sure, without any regmap abstractions, things are somehow manageable.
Though you lose all the nice things that regmap gives you, such as
hardware independence and caching. I might have a different solution,
but I need to get my hands on one of these devices to test.

On a slightly different note: why isn't your driver in the mainline kernel?


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