In addition, my engineer tells me we are using MIC3L which is not used on 
the audio cape.  Thats what I need to get working...

On Wednesday, 4 June 2014 11:50:48 UTC+1, Tristan Phillips wrote:
>
> Hi all,
>
> Bit of a strange question... We are working on something which uses a tlv320 
> in the same layout as the audio cape, with one difference, we have *added* 
> an electret mic.  So our board has line out left/right, line in left/right 
> and also mic in.
>
> Apart from changing the i2c bus everything else is the same.  With a 
> modded overlay (addressing the right i2c bus) output and line input work as 
> expected. However, the mic is not powered as no bias is being provided. 
>  Also the Alsa mixer does not mention the mic anywhere.
>
> My assumption is that I need to modify the device tree overlay to tell the 
> driver that we have a mic present (I'm rather new to audio and dto's, so 
> forgive me if I'm talking rubbish).
>
> Could anyone point me in the right direction to getting this mic working?
>
> Thanks in advance!
>
> Tris
>

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