linux-kernel - Re: [alsa-devel] [PATCH 2/3] ASoC: core: Set the default I/O up try regmap.

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Date:	Fri, 28 Feb 2014 09:15:37 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
CC:	Mark Brown <broonie@...nel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH 2/3] ASoC: core: Set the default I/O up try
 regmap.

On 02/28/2014 08:50 AM, Li.Xiubo@...escale.com wrote:
>
>>
>> A quick grep reveals:
>> mc13783.c:	codec->control_data = dev_get_regmap(codec->dev->parent, NULL);
>> si476x.c:	codec->control_data = dev_get_regmap(codec->dev->parent, NULL);
>> wm5102.c:	codec->control_data = priv->core.arizona->regmap;
>> wm5110.c:	codec->control_data = priv->core.arizona->regmap;
>> wm8997.c:	codec->control_data = priv->core.arizona->regmap;
>>
>> But there might be more.
>>
>
> I have found the following ones, who are using MFD & set_cache_io.
>
>     1    143  sound/soc/codecs/cq93vc.c <<cq93vc_probe>>
>               snd_soc_codec_set_cache_io(codec, 32, 32, SND_SOC_REGMAP);
>     2    618  sound/soc/codecs/mc13783.c <<mc13783_probe>>
>               ret = snd_soc_codec_set_cache_io(codec, 8, 24, SND_SOC_REGMAP);
>     3   1765  sound/soc/codecs/wm5102.c <<wm5102_codec_probe>>
>               ret = snd_soc_codec_set_cache_io(codec, 32, 16, SND_SOC_REGMAP);
>     4   1593  sound/soc/codecs/wm5110.c <<wm5110_codec_probe>>
>               ret = snd_soc_codec_set_cache_io(codec, 32, 16, SND_SOC_REGMAP);
>     5   1510  sound/soc/codecs/wm8350.c <<wm8350_codec_probe>>
>               snd_soc_codec_set_cache_io(codec, 8, 16, SND_SOC_REGMAP);
>     6   1322  sound/soc/codecs/wm8400.c <<wm8400_codec_probe>>
>               snd_soc_codec_set_cache_io(codec, 8, 16, SND_SOC_REGMAP);
>     7   4004  sound/soc/codecs/wm8994.c <<wm8994_codec_probe>>
>               snd_soc_codec_set_cache_io(codec, 16, 16, SND_SOC_REGMAP);
>     8   1058  sound/soc/codecs/wm8997.c <<wm8997_codec_probe>>
>               ret = snd_soc_codec_set_cache_io(codec, 32, 16, SND_SOC_REGMAP);

Yes, I think that's almost all of them. si476x is missing, but I think that 
one is currently broken, as it doesn't call snd_soc_codec_set_cache_io() at all.

As to how to handle those, I think there was a plan to add the possibility 
to assign a regmap to a device, so that dev_get_regmap() returns the regmap 
struct that should be used, even though the device itself did not allocate 
the regmap. But I can't find the details. Mark may know more about this.

- Lars
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