The Pulse Density Modulation (PDM) controller is a digital PDM microphone interface controller and decoder that supports both mono/stereo PDM format, and a Inter-IC Sound (I2S) transmitter that outputs standard stereo audio data to another device. The PDM controller includes two PDM modules, each PDM module can drive one bitstream sampling clock and two bitstream coming data with sampling clock rising and falling edge.
On the JH8100 SoC, PDM and I2S are fixedly connected as follow: PDM module 0 --> I2S channel 0 PDM module 1 --> I2S channel 1
The first patch adds documentation to describe PDM controller bindings. And the second patch adds PDM driver for the StarFive JH8100 SoC. The DTS patch of PDM controller will be submitted after the patchs of JH8100 DTS are accepted.
Xingyu Wu (2): dt-bindings: ASoC: Add PDM controller for the StarFive JH8100 SoC ASoC: starfive: Add PDM controller support
.../bindings/sound/starfive,jh8100-pdm.yaml | 84 ++++ MAINTAINERS | 7 + sound/soc/starfive/Kconfig | 7 + sound/soc/starfive/Makefile | 1 + sound/soc/starfive/jh8100_pdm.c | 395 ++++++++++++++++++ 5 files changed, 494 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/starfive,jh8100-pdm.yaml create mode 100644 sound/soc/starfive/jh8100_pdm.c