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