Documentation/devicetree/bindings/sound/axentia,tse850-pcm5142.txt

   1 Devicetree bindings for the Axentia TSE-850 audio complex
   2
   3 Required properties:
   4   - compatible: "axentia,tse850-pcm5142"
   5   - axentia,cpu-dai: The phandle of the cpu dai.
   6   - axentia,audio-codec: The phandle of the PCM5142 codec.
   7   - axentia,add-gpios: gpio specifier that controls the mixer.
   8   - axentia,loop1-gpios: gpio specifier that controls loop relays on channel 1.
   9   - axentia,loop2-gpios: gpio specifier that controls loop relays on channel 2.
  10   - axentia,ana-supply: Regulator that supplies the output amplifier. Must
  11     support voltages in the 2V - 20V range, in 1V steps.
  12
  13 The schematics explaining the gpios are as follows:
  14
  15                loop1 relays
  16    IN1 +---o  +------------+  o---+ OUT1
  17             \                /
  18              +              +
  19              |   /          |
  20              +--o  +--.     |
  21              |  add   |     |
  22              |        V     |
  23              |      .---.   |
  24    DAC +----------->|Sum|---+
  25              |      '---'   |
  26              |              |
  27              +              +
  28
  29    IN2 +---o--+------------+--o---+ OUT2
  30                loop2 relays
  31
  32 The 'loop1' gpio pin controlls two relays, which are either in loop position,
  33 meaning that input and output are directly connected, or they are in mixer
  34 position, meaning that the signal is passed through the 'Sum' mixer. Similarly
  35 for 'loop2'.
  36
  37 In the above, the 'loop1' relays are inactive, thus feeding IN1 to the mixer
  38 (if 'add' is active) and feeding the mixer output to OUT1. The 'loop2' relays
  39 are active, short-cutting the TSE-850 from channel 2. IN1, IN2, OUT1 and OUT2
  40 are TSE-850 connectors and DAC is the PCB name of the (filtered) output from
  41 the PCM5142 codec.
  42
  43 Example:
  44
  45         &ssc0 {
  46                 #sound-dai-cells = <0>;
  47
  48                 status = "okay";
  49         };
  50
  51         &i2c {
  52                 codec: pcm5142@4c {
  53                         compatible = "ti,pcm5142";
  54
  55                         reg = <0x4c>;
  56
  57                         AVDD-supply = <&reg_3v3>;
  58                         DVDD-supply = <&reg_3v3>;
  59                         CPVDD-supply = <&reg_3v3>;
  60
  61                         clocks = <&sck>;
  62
  63                         pll-in = <3>;
  64                         pll-out = <6>;
  65                 };
  66         };
  67
  68         ana: ana-reg {
  69                 compatible = "pwm-regulator";
  70
  71                 regulator-name = "ANA";
  72
  73                 pwms = <&pwm0 2 1000 PWM_POLARITY_INVERTED>;
  74                 pwm-dutycycle-unit = <1000>;
  75                 pwm-dutycycle-range = <100 1000>;
  76
  77                 regulator-min-microvolt = <2000000>;
  78                 regulator-max-microvolt = <20000000>;
  79                 regulator-ramp-delay = <1000>;
  80         };
  81
  82         sound {
  83                 compatible = "axentia,tse850-pcm5142";
  84
  85                 axentia,cpu-dai = <&ssc0>;
  86                 axentia,audio-codec = <&codec>;
  87
  88                 axentia,add-gpios = <&pioA 8 GPIO_ACTIVE_LOW>;
  89                 axentia,loop1-gpios = <&pioA 10 GPIO_ACTIVE_LOW>;
  90                 axentia,loop2-gpios = <&pioA 11 GPIO_ACTIVE_LOW>;
  91
  92                 axentia,ana-supply = <&ana>;
  93         };