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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/dac/adi,ltc2688.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices LTC2688 DAC
maintainers:
- Nuno Sá <nuno.sa@analog.com>
description: |
Analog Devices LTC2688 16 channel, 16 bit, +-15V DAC
https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2688.pdf
properties:
compatible:
enum:
- adi,ltc2688
reg:
maxItems: 1
vcc-supply:
description: Analog Supply Voltage Input.
iovcc-supply:
description: Digital Input/Output Supply Voltage.
vref-supply:
description:
Reference Input/Output. The voltage at the REF pin sets the full-scale
range of all channels. If not provided the internal reference is used and
also provided on the VREF pin".
clr-gpios:
description:
If specified, it will be asserted during driver probe. As the line is
active low, it should be marked GPIO_ACTIVE_LOW.
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
patternProperties:
"^channel@([0-9]|1[0-5])$":
type: object
additionalProperties: false
properties:
reg:
description: The channel number representing the DAC output channel.
maximum: 15
adi,toggle-mode:
description:
Set the channel as a toggle enabled channel. Toggle operation enables
fast switching of a DAC output between two different DAC codes without
any SPI transaction.
type: boolean
adi,output-range-microvolt:
description: Specify the channel output full scale range.
oneOf:
- items:
- const: 0
- enum: [5000000, 10000000]
- items:
- const: -5000000
- const: 5000000
- items:
- const: -10000000
- const: 10000000
- items:
- const: -15000000
- const: 15000000
adi,overrange:
description: Enable 5% overrange over the selected full scale range.
type: boolean
clocks:
maxItems: 1
adi,toggle-dither-input:
description:
Selects the TGPx pin to be associated with this channel. This setting
only makes sense for toggle or dither enabled channels. If
@adi,toggle-mode is not set and this property is given, the channel is
assumed to be a dither capable channel. Note that multiple channels
can be mapped to the same pin. If this setting is given, the
respective @clock must also be provided. Mappings between this and
input pins
0 - TGP1
1 - TGP2
2 - TGP3
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2]
dependencies:
adi,toggle-dither-input: [ clocks ]
required:
- reg
required:
- compatible
- reg
additionalProperties: false
examples:
- |
spi {
#address-cells = <1>;
#size-cells = <0>;
ltc2688: ltc2688@0 {
compatible = "adi,ltc2688";
reg = <0>;
vcc-supply = <&vcc>;
iovcc-supply = <&vcc>;
vref-supply = <&vref>;
#address-cells = <1>;
#size-cells = <0>;
channel@0 {
reg = <0>;
adi,toggle-mode;
adi,overrange;
};
channel@1 {
reg = <1>;
adi,output-range-microvolt = <0 10000000>;
clocks = <&clock_tgp3>;
adi,toggle-dither-input = <2>;
};
};
};
...
|
