93 lines
2.5 KiB
Plaintext
93 lines
2.5 KiB
Plaintext
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Devicetree bindings for the Axentia TSE-850 audio complex
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Required properties:
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- compatible: "axentia,tse850-pcm5142"
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- axentia,cpu-dai: The phandle of the cpu dai.
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- axentia,audio-codec: The phandle of the PCM5142 codec.
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- axentia,add-gpios: gpio specifier that controls the mixer.
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- axentia,loop1-gpios: gpio specifier that controls loop relays on channel 1.
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- axentia,loop2-gpios: gpio specifier that controls loop relays on channel 2.
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- axentia,ana-supply: Regulator that supplies the output amplifier. Must
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support voltages in the 2V - 20V range, in 1V steps.
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The schematics explaining the gpios are as follows:
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loop1 relays
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IN1 +---o +------------+ o---+ OUT1
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\ /
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+ +
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| / |
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+--o +--. |
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| add | |
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| V |
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| .---. |
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DAC +----------->|Sum|---+
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| '---' |
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+ +
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IN2 +---o--+------------+--o---+ OUT2
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loop2 relays
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The 'loop1' gpio pin controlls two relays, which are either in loop position,
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meaning that input and output are directly connected, or they are in mixer
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position, meaning that the signal is passed through the 'Sum' mixer. Similarly
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for 'loop2'.
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In the above, the 'loop1' relays are inactive, thus feeding IN1 to the mixer
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(if 'add' is active) and feeding the mixer output to OUT1. The 'loop2' relays
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are active, short-cutting the TSE-850 from channel 2. IN1, IN2, OUT1 and OUT2
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are TSE-850 connectors and DAC is the PCB name of the (filtered) output from
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the PCM5142 codec.
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Example:
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&ssc0 {
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#sound-dai-cells = <0>;
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};
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&i2c {
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codec: pcm5142@4c {
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compatible = "ti,pcm5142";
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reg = <0x4c>;
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AVDD-supply = <®_3v3>;
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DVDD-supply = <®_3v3>;
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CPVDD-supply = <®_3v3>;
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clocks = <&sck>;
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pll-in = <3>;
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pll-out = <6>;
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};
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};
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ana: ana-reg {
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compatible = "pwm-regulator";
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regulator-name = "ANA";
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pwms = <&pwm0 2 1000 PWM_POLARITY_INVERTED>;
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pwm-dutycycle-unit = <1000>;
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pwm-dutycycle-range = <100 1000>;
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regulator-min-microvolt = <2000000>;
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regulator-max-microvolt = <20000000>;
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regulator-ramp-delay = <1000>;
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};
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sound {
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compatible = "axentia,tse850-pcm5142";
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axentia,cpu-dai = <&ssc0>;
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axentia,audio-codec = <&codec>;
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axentia,add-gpios = <&pioA 8 GPIO_ACTIVE_LOW>;
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axentia,loop1-gpios = <&pioA 10 GPIO_ACTIVE_LOW>;
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axentia,loop2-gpios = <&pioA 11 GPIO_ACTIVE_LOW>;
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axentia,ana-supply = <&ana>;
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};
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