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    • Marek Vasut's avatar
      ASoC: sgtl5000: add multi endpoint support · 06bf8ea4
      Marek Vasut authored
      Support multiple endpoints on SGTL5000 codec port when used in
      of_graph context.
      
      This patch allows to share the codec port between two CPU DAIs.
      
      Example:
      
      Custom STM32MP157C board uses SGTL5000 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 (SGTL5000)
      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:
      sgtl5000_port: port {
          sgtl5000_tx_endpoint: endpoint@0 {
      	    remote-endpoint = <&sai2a_endpoint>;
          };
          sgtl5000_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 avatarMarek Vasut <marex@denx.de>
      Cc: Mark Brown <broonie@kernel.org>
      Link: https://lore.kernel.org/r/20191219213219.366073-1-marex@denx.deSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      06bf8ea4