linux-kernel - Re: [alsa-devel] [PATCH v6] sound/soc/codecs: add LAPIS Semiconductor ML26124

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Date:	Wed, 14 Mar 2012 18:40:20 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Tomoya MORINAGA <tomoya.rohm@...il.com>
CC:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	alsa-devel@...a-project.org, qi.wang@...el.com,
	Takashi Iwai <tiwai@...e.de>, linux-kernel@...r.kernel.org,
	yong.y.wang@...el.com, kok.howg.ewe@...el.com,
	Liam Girdwood <lrg@...com>, joel.clark@...el.com
Subject: Re: [alsa-devel] [PATCH v6] sound/soc/codecs: add LAPIS	Semiconductor
 ML26124

On 03/08/2012 03:24 AM, Tomoya MORINAGA wrote:
> On Wed, Mar 7, 2012 at 8:48 PM, Mark Brown
> <broonie@...nsource.wolfsonmicro.com> wrote:
>>> If possible, I want to use framework features. However, I judged it is
>>> not possible.
>>> Let me confirm again.
>>> As I said before, all ML26124 registers need to be accessed by
>>> different address when read and write.
>>> Like below
>>> R       W
>>> $00h $01h Sampling setting
>>> $02h $03h PLL setting
>>> ...
>>> Even so, can I use framework features ?
>> No, in which case (to repeat what I said previously) you need to make
>> the code *much* clearer so the reader can understand what it is doing
>> and why it's having to open code this stuff.
> 
> 
> thanks.

If this is for all registers, how does stuff like DAPM work, which uses the
framework internal update_bits function?

If it's the case that the write address is always read address + 1 you can
still use the framework if you set write_flag_mask to 0x01 in your regmap
config. In my opinion it even makes sense to shift all the register numbers
to the left by one and use a 7/9 instead of a 8/8 addr/reg layout. This will
reduce the amount of memory wasted due to holes in the register cache.
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