The Pulse Density Modulation Inteface Controller driver includes two parts. 1) Driver code to implement the PDMIC function. 2) Device tree binding documentation, it describes how to add the PDMIC in device tree.
Songjun Wu (2): ASoC: atmel-pdmic: add the Pulse Density Modulation Interface Controller ASoC: atmel-pdmic: DT binding for PDMIC driver
.../devicetree/bindings/sound/atmel-pdmic.txt | 55 ++ sound/soc/atmel/Kconfig | 9 + sound/soc/atmel/Makefile | 2 + sound/soc/atmel/atmel-pdmic.c | 745 ++++++++++++++++++++ sound/soc/atmel/atmel-pdmic.h | 80 +++ 5 files changed, 891 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/atmel-pdmic.txt create mode 100644 sound/soc/atmel/atmel-pdmic.c create mode 100644 sound/soc/atmel/atmel-pdmic.h