1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/iio/adc/ti,adc12138.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Texas Instruments ADC12138 and similar self-calibrating ADCs
8
9 maintainers:
10 - Akinobu Mita <akinobu.mita@gmail.com>
11
12 description: |
13 13 bit ADCs with 1, 2 or 8 inputs and self calibrating circuitry to
14 correct for linearity, zero and full scale errors.
15
16 properties:
17 compatible:
18 enum:
19 - ti,adc12130
20 - ti,adc12132
21 - ti,adc12138
22
23 reg:
24 maxItems: 1
25
26 interrupts:
27 maxItems: 1
28 description: End of Conversion (EOC) interrupt
29
30 clocks:
31 maxItems: 1
32 description: Conversion clock input.
33
34 vref-p-supply:
35 description: The regulator supply for positive analog voltage reference
36
37 vref-n-supply:
38 description: |
39 The regulator supply for negative analog voltage reference
40 (Note that this must not go below GND or exceed vref-p)
41 If not specified, this is assumed to be analog ground.
42
43 ti,acquisition-time:
44 $ref: /schemas/types.yaml#/definitions/uint32
45 enum: [ 6, 10, 18, 34 ]
46 description: |
47 The number of conversion clock periods for the S/H's acquisition time.
48 For high source impedances, this value can be increased to 18 or 34.
49 For less ADC accuracy and/or slower CCLK frequencies this value may be
50 decreased to 6. See section 6.0 INPUT SOURCE RESISTANCE in the
51 datasheet for details.
52
53 "#io-channel-cells":
54 const: 1
55
56 required:
57 - compatible
58 - reg
59 - interrupts
60 - clocks
61 - vref-p-supply
62
63 allOf:
64 - $ref: /schemas/spi/spi-peripheral-props.yaml#
65
66 unevaluatedProperties: false
67
68 examples:
69 - |
70 #include <dt-bindings/interrupt-controller/irq.h>
71 spi {
72 #address-cells = <1>;
73 #size-cells = <0>;
74
75 adc@0 {
76 compatible = "ti,adc12138";
77 reg = <0>;
78 interrupts = <28 IRQ_TYPE_EDGE_RISING>;
79 interrupt-parent = <&gpio1>;
80 clocks = <&cclk>;
81 vref-p-supply = <&ldo4_reg>;
82 spi-max-frequency = <5000000>;
83 ti,acquisition-time = <6>;
84 #io-channel-cells = <1>;
85 };
86 };
87 ...
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