required register is
SRU/ADG/SSI if generation1
SRU/ADG/SSIU/SSI if generation2
-- rcar_sound,ssi : SSI subnode
-- rcar_sound,scu : SCU subnode
-- rcar_sound,dai : DAI subnode
+- rcar_sound,ssi : Should contain SSI feature.
+ The number of SSI subnode should be same as HW.
+ see below for detail.
+- rcar_sound,src : Should contain SRC feature.
+ The number of SRC subnode should be same as HW.
+ see below for detail.
+- rcar_sound,dai : DAI contents.
+ The number of DAI subnode should be same as HW.
+ see below for detail.
SSI subnode properties:
- interrupts : Should contain SSI interrupt for PIO transfer
- shared-pin : if shared clock pin
+SRC subnode properties:
+no properties at this point
+
DAI subnode properties:
- playback : list of playback modules
- capture : list of capture modules