xref: /linux/Documentation/devicetree/bindings/sound/axentia,tse850-pcm5142.txt (revision bfd5bb6f90af092aa345b15cd78143956a13c2a8) 
1Devicetree bindings for the Axentia TSE-850 audio complex
2
3Required 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
13The 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
32The 'loop1' gpio pin controlls two relays, which are either in loop position,
33meaning that input and output are directly connected, or they are in mixer
34position, meaning that the signal is passed through the 'Sum' mixer. Similarly
35for 'loop2'.
36
37In 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
39are active, short-cutting the TSE-850 from channel 2. IN1, IN2, OUT1 and OUT2
40are TSE-850 connectors and DAC is the PCB name of the (filtered) output from
41the PCM5142 codec.
42
43Example:
44
45	&ssc0 {
46		#sound-dai-cells = <0>;
47
48	};
49
50	&i2c {
51		codec: pcm5142@4c {
52			compatible = "ti,pcm5142";
53
54			reg = <0x4c>;
55
56			AVDD-supply = <&reg_3v3>;
57			DVDD-supply = <&reg_3v3>;
58			CPVDD-supply = <&reg_3v3>;
59
60			clocks = <&sck>;
61
62			pll-in = <3>;
63			pll-out = <6>;
64		};
65	};
66
67	ana: ana-reg {
68		compatible = "pwm-regulator";
69
70		regulator-name = "ANA";
71
72		pwms = <&pwm0 2 1000 PWM_POLARITY_INVERTED>;
73		pwm-dutycycle-unit = <1000>;
74		pwm-dutycycle-range = <100 1000>;
75
76		regulator-min-microvolt = <2000000>;
77		regulator-max-microvolt = <20000000>;
78		regulator-ramp-delay = <1000>;
79	};
80
81	sound {
82		compatible = "axentia,tse850-pcm5142";
83
84		axentia,cpu-dai = <&ssc0>;
85		axentia,audio-codec = <&codec>;
86
87		axentia,add-gpios = <&pioA 8 GPIO_ACTIVE_LOW>;
88		axentia,loop1-gpios = <&pioA 10 GPIO_ACTIVE_LOW>;
89		axentia,loop2-gpios = <&pioA 11 GPIO_ACTIVE_LOW>;
90
91		axentia,ana-supply = <&ana>;
92	};
93