Am Montag, den 18.04.2011, 20:58 -0600 schrieb Stephen Warren:
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?
Hi,
actually the wm8903 codec needs GPIO1 and GPIO2 to be configured properly to be able to use DMIC actually. I would propose to automatically configure these to DMIC-mode whenever ADCINPUT is set to DMIC. Would you agree with this procedure? I would prepare a patch which changes all relevant registers then.
Regards, Julian