1. 01 Apr, 2019 1 commit
    • Olivier Moysan's avatar
      ASoC: cs42l51: add multi endpoint support · ad6bb306
      Olivier Moysan authored
      Support multiple endpoints on cs42L51 codec port
      when used in of_graph context.
      
      This patch allows to share the codec port between two CPU DAIs.
      
      Example:
      
      STM32MP157C-DK2 board uses CS42L51 audio codec.
      This codec is connected to two serial audio interfaces,
      which are configured either as rx or tx.
      
      From AsoC point of view the topolgy is the following:
      // 2 CPU DAIs (SAI2A/B), 1 Codec (CS42L51)
      Playback: CPU-A-DAI(slave) -> (master)CODEC-DAI/port0
      Record:   CPU-B-DAI(slave) <- (master)CODEC-DAI/port0
      
      In the DT two endpoints have to be associated to the codec port:
      cs42l51_port: port {
      	cs42l51_tx_endpoint: endpoint@0 {
      		remote-endpoint = <&sai2a_endpoint>;
      	};
      	cs42l51_rx_endpoint: endpoint@1 {
      		remote-endpoint = <&sai2b_endpoint>;
      	};
      };
      
      However, when the audio graph card parses the codec nodes, it expects
      to find DAI interface indexes matching the endpoints indexes.
      
      The current patch forces the use of DAI id 0 for both endpoints,
      which allows to share the codec DAI between the two CPU DAIs
      for playback and capture streams respectively.
      Signed-off-by: default avatarOlivier Moysan <olivier.moysan@st.com>
      Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      ad6bb306
  2. 27 Mar, 2019 1 commit
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