1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/iio/dac/st,stm32-dac.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: STMicroelectronics STM32 DAC
8
9 description: |
10 The STM32 DAC is a 12-bit voltage output digital-to-analog converter. The DAC
11 may be configured in 8 or 12-bit mode. It has two output channels, each with
12 its own converter.
13 It has built-in noise and triangle waveform generator and supports external
14 triggers for conversions. The DAC's output buffer allows a high drive output
15 current.
16
17 maintainers:
18 - Fabrice Gasnier <fabrice.gasnier@foss.st.com>
19
20 properties:
21 compatible:
22 enum:
23 - st,stm32f4-dac-core
24 - st,stm32h7-dac-core
25
26 reg:
27 maxItems: 1
28
29 resets:
30 maxItems: 1
31
32 clocks:
33 maxItems: 1
34
35 clock-names:
36 items:
37 - const: pclk
38
39 vref-supply:
40 description: Phandle to the vref input analog reference voltage.
41
42 '#address-cells':
43 const: 1
44
45 '#size-cells':
46 const: 0
47
48 access-controllers:
49 minItems: 1
50 maxItems: 2
51
52 additionalProperties: false
53
54 required:
55 - compatible
56 - reg
57 - clocks
58 - clock-names
59 - vref-supply
60 - '#address-cells'
61 - '#size-cells'
62
63 patternProperties:
64 "^dac@[1-2]+$":
65 type: object
66 description:
67 A DAC block node should contain at least one subnode, representing an
68 DAC instance/channel available on the machine.
69
70 properties:
71 compatible:
72 const: st,stm32-dac
73
74 reg:
75 description: Must be either 1 or 2, to define (single) channel in use
76 enum: [1, 2]
77
78 '#io-channel-cells':
79 const: 1
80
81 additionalProperties: false
82
83 required:
84 - compatible
85 - reg
86 - '#io-channel-cells'
87
88 examples:
89 - |
90 // Example on stm32mp157c
91 #include <dt-bindings/clock/stm32mp1-clks.h>
92 dac: dac@40017000 {
93 compatible = "st,stm32h7-dac-core";
94 reg = <0x40017000 0x400>;
95 clocks = <&rcc DAC12>;
96 clock-names = "pclk";
97 vref-supply = <&vref>;
98 #address-cells = <1>;
99 #size-cells = <0>;
100
101 dac@1 {
102 compatible = "st,stm32-dac";
103 #io-channel-cells = <1>;
104 reg = <1>;
105 };
106
107 dac@2 {
108 compatible = "st,stm32-dac";
109 #io-channel-cells = <1>;
110 reg = <2>;
111 };
112 };
113
114 ...
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