When two (or more) amplifiers are on the same link, the integrator may: a) assign dedicated slots for each of the amplifiers. b) provide the same configuration to all amplifiers, and rely on additional controls/processing in the amplifier to generate different outputs. case a) was the initial direction for SoundWire and is required for amplifiers with limited capabilities, but to deal with orientation or 'posture' changes it's easier to implement case b) when the amplifier can deal with multiple channels. This patchset suggest the use of the set_tdm_slot() API to define which of the channels will be consumed by what amplifiers. This maps well with SoundWire's 'ChannelEnable' registers. The notion of slot_width is however irrelevant here and ignored, and SoundWire ports are typically single direction, so only one of the two masks shall be used. Pierre-Louis Bossart (2): ASoC: rt1308-sdw: add set_tdm_slot() support ASoC: rt1308-sdw: use slot and rx_mask to configure stream sound/soc/codecs/rt1308-sdw.c | 38 +++++++++++++++++++++++++++++++---- sound/soc/codecs/rt1308-sdw.h | 2 ++ 2 files changed, 36 insertions(+), 4 deletions(-) -- 2.20.1
