From mboxrd@z Thu Jan 1 00:00:00 1970 From: Liam Girdwood Subject: Re: [PATCH] ASoC: WM8903: Implement DMIC support Date: Wed, 20 Apr 2011 12:10:12 +0100 Message-ID: <1303297812.3436.1.camel@odin> References: <1303181891-25064-1-git-send-email-swarren@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-wy0-f179.google.com (mail-wy0-f179.google.com [74.125.82.179]) by alsa0.perex.cz (Postfix) with ESMTP id ADEB91037FC for ; Wed, 20 Apr 2011 13:10:16 +0200 (CEST) Received: by wyg36 with SMTP id 36so557132wyg.38 for ; Wed, 20 Apr 2011 04:10:16 -0700 (PDT) In-Reply-To: <1303181891-25064-1-git-send-email-swarren@nvidia.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Stephen Warren Cc: alsa-devel@alsa-project.org, broonie@opensource.wolfsonmicro.com List-Id: alsa-devel@alsa-project.org On Mon, 2011-04-18 at 20:58 -0600, Stephen Warren wrote: > In addition to the currently supported analog capture path, the WM8903 > also supports digital mics. > > The analog and digital capture paths are exclusive; a mux is present to > select the capture source. > > Logically, the mux exists to select the decimator's input, from either > the ADC or DMIC block outputs. However, the ADC power domain also > includes the DMIC interface. Consequently, this change represents the > mux as existing immediately before the ADC, and selecting between the > Input PGA and DMIC block outputs. > > An alternative might be to represent the mux in its correct location, > and associate the ADC power enable controls with both the real ADC, and > a fake ADC for the DMIC? > > Signed-off-by: Stephen Warren Acked-by: Liam Girdwood