Rockchip PDM Controller Driver

modulename: snd-soc-rockchip-pdm.ko

configname: CONFIG_SND_SOC_ROCKCHIP_PDM

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>Rockchip PDM Controller Driver
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say Y or M if you want to add support for PDM driver for
Rockchip PDM Controller. The Controller supports up to maximum of
8 channels record.

source code: