summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/sound/st,sta350.txt
blob: 307398ef2317d4a5f31937579a74c1409d1487df (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
STA350 audio CODEC

The driver for this device only supports I2C.

Required properties:

  - compatible: "st,sta350"
  - reg: the I2C address of the device for I2C
  - reset-gpios: a GPIO spec for the reset pin. If specified, it will be
		 deasserted before communication to the codec starts.

  - power-down-gpios: a GPIO spec for the power down pin. If specified,
		      it will be deasserted before communication to the codec
		      starts.

  - vdd-dig-supply: regulator spec, providing 3.3V
  - vdd-pll-supply: regulator spec, providing 3.3V
  - vcc-supply: regulator spec, providing 5V - 26V

Optional properties:

  -  st,output-conf: number, Selects the output configuration:
	0: 2-channel (full-bridge) power, 2-channel data-out
	1: 2 (half-bridge). 1 (full-bridge) on-board power
	2: 2 Channel (Full-Bridge) Power, 1 Channel FFX
	3: 1 Channel Mono-Parallel
	If parameter is missing, mode 0 will be enabled.
	This property has to be specified as '/bits/ 8' value.

  -  st,ch1-output-mapping: Channel 1 output mapping
  -  st,ch2-output-mapping: Channel 2 output mapping
  -  st,ch3-output-mapping: Channel 3 output mapping
	0: Channel 1
	1: Channel 2
	2: Channel 3
	If parameter is missing, channel 1 is chosen.
	This properties have to be specified as '/bits/ 8' values.

  -  st,thermal-warning-recover:
	If present, thermal warning recovery is enabled.

  -  st,thermal-warning-adjustment:
	If present, thermal warning adjustment is enabled.

  -  st,fault-detect-recovery:
	If present, then fault recovery will be enabled.

  -  st,ffx-power-output-mode: string
	The FFX power output mode selects how the FFX output timing is
	configured. Must be one of these values:
	  -  "drop-compensation"
	  -  "tapered-compensation"
	  -  "full-power-mode"
	  -  "variable-drop-compensation" (default)

  -  st,drop-compensation-ns: number
	Only required for "st,ffx-power-output-mode" ==
	"variable-drop-compensation".
	Specifies the drop compensation in nanoseconds.
	The value must be in the range of 0..300, and only
	multiples of 20 are allowed. Default is 140ns.

  -  st,overcurrent-warning-adjustment:
	If present, overcurrent warning adjustment is enabled.

  -  st,max-power-use-mpcc:
	If present, then MPCC bits are used for MPC coefficients,
	otherwise standard MPC coefficients are used.

  -  st,max-power-corr:
	If present, power bridge correction for THD reduction near maximum
	power output is enabled.

  -  st,am-reduction-mode:
	If present, FFX mode runs in AM reduction mode, otherwise normal
	FFX mode is used.

  -  st,odd-pwm-speed-mode:
	If present, PWM speed mode run on odd speed mode (341.3 kHz) on all
	channels. If not present, normal PWM spped mode (384 kHz) will be used.

  -  st,distortion-compensation:
	If present, distortion compensation variable uses DCC coefficient.
	If not present, preset DC coefficient is used.

  -  st,invalid-input-detect-mute:
	If present, automatic invalid input detect mute is enabled.

  -  st,activate-mute-output:
	If present, a mute output will be activated in ase the volume will
	reach a value lower than -76 dBFS.

  -  st,bridge-immediate-off:
	If present, the bridge will be switched off immediately after the
	power-down-gpio goes low. Otherwise, the bridge will wait for 13
	million clock cycles to pass before shutting down.

  -  st,noise-shape-dc-cut:
	If present, the noise-shaping technique on the DC cutoff filter are
	enabled.

  -  st,powerdown-master-volume:
	If present, the power-down pin and I2C power-down functions will
	act on the master volume. Otherwise, the functions will act on the
	mute commands.

  -  st,powerdown-delay-divider:
	If present, the bridge power-down time will be divided by the provided
	value. If not specified, a divider of 1 will be used. Allowed values
	are 1, 2, 4, 8, 16, 32, 64 and 128.
	This property has to be specified as '/bits/ 8' value.

Example:

codec: sta350@38 {
	compatible = "st,sta350";
	reg = <0x1c>;
	reset-gpios = <&gpio1 19 0>;
	power-down-gpios = <&gpio1 16 0>;
	st,output-conf = /bits/ 8  <0x3>;	// set output to 2-channel
						// (full-bridge) power,
						// 2-channel data-out
	st,ch1-output-mapping = /bits/ 8 <0>;	// set channel 1 output ch 1
	st,ch2-output-mapping = /bits/ 8 <0>;	// set channel 2 output ch 1
	st,ch3-output-mapping = /bits/ 8 <0>;	// set channel 3 output ch 1
	st,max-power-correction;		// enables power bridge
						// correction for THD reduction
						// near maximum power output
	st,invalid-input-detect-mute;		// mute if no valid digital
						// audio signal is provided.
};