linux-kernel - Re: [PATCH v3] sound/soc/codecs: add LAPIS Semiconductor ML26124

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Date:	Thu, 01 Dec 2011 20:36:20 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Tomoya MORINAGA <tomoya.rohm@...il.com>
CC:	Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Mike Frysinger <vapier@...too.org>,
	Daniel Mack <zonque@...il.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, qi.wang@...el.com,
	yong.y.wang@...el.com, joel.clark@...el.com, kok.howg.ewe@...el.com
Subject: Re: [PATCH v3] sound/soc/codecs: add LAPIS Semiconductor ML26124

On 12/01/2011 08:46 AM, Tomoya MORINAGA wrote:
> 2011/11/29 Lars-Peter Clausen <lars@...afoo.de>:
>>
>> Also this doesn't make much sense:
>> +       {"Input Mux", "Analog MIC in", "MICBIAS"},
>> +       {"Input Mux", "Digital MIC in", "MICBIAS"},
>>
>> You have mux, but both possible settings of the mux connect to the same
>> source, which pretty much makes the mux useless.
>>
> 
> Yes, you are right.
> This setting was miss-settings.
> This MICBIAS supplies to external MIC as reference voltage.
> So, I think MICBIAS shouldn't appear at this setting.
> I show modified settings.
>        /* input */
>        {"Input Mux", "Analog MIC SingleEnded in", "MIN"},
>        {"Input Mux", "Analog MIC Differential in", "MIN"},
>        {"Input Mux", "Digital MIC in", "MDIN"},
>        {"ADC", "PGA", "Input Mux"},
> 

The middle part(the control) of the path must either be a control attached to
the mixer on the left side(the sink) or a element of the mux's enum if a mux is
on the left side. If the left side is neither a mixer or a mux the middle part
is ignored.

The other problem probably is that you have one mux which lets you switch
between single-ended analog input, differential analog input and digital input.
The first two options are routed through PGA and ADC the later not.

- Lars
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