Question on hda sigmatel codec dmics

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Folks:
 
I have yet another question; this having to do with the arrays of dmic
nids for the STAC 9205. I look at the 
patch_sigmatel.c file; the following section:
 
================================================
static hda_nid_t stac9205_mux_nids[2] = {
        0x19, 0x1a
};
 
static hda_nid_t stac9205_dmic_nids[3] = {
        0x17, 0x18, 0
};
 
static hda_nid_t stac9200_pin_nids[8] = {
        0x08, 0x09, 0x0d, 0x0e,
        0x0f, 0x10, 0x11, 0x12,
================================================
 
I notice that the dmic_nids array of hda_nit_t structure has one with a
value of zero, 
but the others, pin_nids and mux_nids don't. Later in the patch_9205
code, the num_dmics
is 2.
 
Why the extra dmic_nid with a value of 0?
 
Thanks
 
Mark Allyn

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