The TDA998x HDMI transmitter accepts audio input from either I2S or S/PDIF.
Theses inputs have different intrinsic constraints and these constraints may be modified by the audio parameters of the connected video device.
The choice of I2S or S/PDIF may be the done by the user or by automatic processing (DPCM?) at each audio starting time. This asks for a dynamic audio input switch in the HDMI driver.
This patch series implements the TDA998x specific CODEC. A simple function call mechanism is used for exchanges between the CODEC and the HDMI driver.
Jean-Francois Moine (4): drm/i2c: tda998x: add a function for dynamic audio input switch ASoC: tda998x: add a codec driver for TDA998x ASoC: tda998x: add DT documentation ASoC: tda998x: adjust the audio hw parameters from EDID
.../devicetree/bindings/sound/tda998x.txt | 14 + drivers/gpu/drm/i2c/tda998x_drv.c | 58 +++- include/drm/i2c/tda998x.h | 8 +- sound/soc/codecs/Kconfig | 7 + sound/soc/codecs/Makefile | 2 + sound/soc/codecs/tda998x.c | 304 +++++++++++++++++++++ 6 files changed, 390 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/sound/tda998x.txt create mode 100644 sound/soc/codecs/tda998x.c