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Message-ID: <2E89032DDAA8B9408CB92943514A0337D460CAAD@SW-EX-MBX01.diasemi.com>
Date: Fri, 6 Nov 2015 13:17:28 +0000
From: "Opensource [Adam Thomson]" <Adam.Thomson.Opensource@...semi.com>
To: Mark Brown <broonie@...nel.org>,
"Opensource [Adam Thomson]" <Adam.Thomson.Opensource@...semi.com>
CC: Liam Girdwood <lgirdwood@...il.com>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Support Opensource" <Support.Opensource@...semi.com>
Subject: RE: [PATCH 2/2] ASoC: codecs: Add da7218 codec driver
On November 6, 2015 11:55, Mark Brown wrote:
> > > > I can envisage in a system you may want to choose which capture channels can
> > > > trigger level detection (if any), and this may change depending on the use-case
> > > > at the time, so having it as a control makes sense to me.
>
> > > What is a "capture channel" here?
>
> > Input filters 1L/R and 2L/R, which are fed from either Mic1(ADC1) or DMic1L/R
> > and Mic2(ADC2) or DMic2L/R.
>
> Hang on, is this just recording a DC value with the ADC and then looking
> at that?
The RMS of the Mic signal is taken and compared to the trigger level set. If
it's above that level then an IRQ is raised.
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