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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/mfd/gateworks-gsc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Gateworks System Controller
description: |
The Gateworks System Controller (GSC) is a device present across various
Gateworks product families that provides a set of system related features
such as the following (refer to the board hardware user manuals to see what
features are present)
- Watchdog Timer
- GPIO
- Pushbutton controller
- Hardware monitor with ADC's for temperature and voltage rails and
fan controller
maintainers:
- Tim Harvey <tharvey@gateworks.com>
properties:
$nodename:
pattern: "gsc@[0-9a-f]{1,2}"
compatible:
const: gw,gsc
reg:
description: I2C device address
maxItems: 1
interrupts:
maxItems: 1
interrupt-controller: true
"#interrupt-cells":
const: 1
"#address-cells":
const: 1
"#size-cells":
const: 0
adc:
type: object
additionalProperties: false
description: Optional hardware monitoring module
properties:
compatible:
const: gw,gsc-adc
"#address-cells":
const: 1
"#size-cells":
const: 0
patternProperties:
"^channel@[0-9a-f]+$":
type: object
additionalProperties: false
description: |
Properties for a single ADC which can report cooked values
(i.e. temperature sensor based on thermister), raw values
(i.e. voltage rail with a pre-scaling resistor divider).
properties:
reg:
description: Register of the ADC
maxItems: 1
label:
description: Name of the ADC input
gw,mode:
description: |
conversion mode:
0 - temperature, in C*10
1 - pre-scaled 24-bit voltage value
2 - scaled voltage based on an optional resistor divider
and optional offset
3 - pre-scaled 16-bit voltage value
4 - fan tach input to report RPM's
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3, 4]
gw,voltage-divider-ohms:
description: Values of resistors for divider on raw ADC input
maxItems: 2
items:
minimum: 1000
maximum: 1000000
gw,voltage-offset-microvolt:
description: |
A positive voltage offset to apply to a raw ADC
(i.e. to compensate for a diode drop).
minimum: 0
maximum: 1000000
required:
- gw,mode
- reg
- label
required:
- compatible
- "#address-cells"
- "#size-cells"
patternProperties:
"^fan-controller@[0-9a-f]+$":
type: object
additionalProperties: false
description: Optional fan controller
properties:
compatible:
const: gw,gsc-fan
reg:
description: The fan controller base address
maxItems: 1
required:
- compatible
- reg
required:
- compatible
- reg
- interrupts
- interrupt-controller
- "#interrupt-cells"
- "#address-cells"
- "#size-cells"
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
gsc@20 {
compatible = "gw,gsc";
reg = <0x20>;
interrupt-parent = <&gpio1>;
interrupts = <4 IRQ_TYPE_LEVEL_LOW>;
interrupt-controller;
#interrupt-cells = <1>;
#address-cells = <1>;
#size-cells = <0>;
adc {
compatible = "gw,gsc-adc";
#address-cells = <1>;
#size-cells = <0>;
channel@0 { /* A0: Board Temperature */
reg = <0x00>;
label = "temp";
gw,mode = <0>;
};
channel@2 { /* A1: Input Voltage (raw ADC) */
reg = <0x02>;
label = "vdd_vin";
gw,mode = <1>;
gw,voltage-divider-ohms = <22100 1000>;
gw,voltage-offset-microvolt = <800000>;
};
channel@b { /* A2: Battery voltage */
reg = <0x0b>;
label = "vdd_bat";
gw,mode = <1>;
};
};
fan-controller@2c {
compatible = "gw,gsc-fan";
reg = <0x2c>;
};
};
};
|
