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 spi-max-frequency: true
35
36 vref-p-supply:
37 description: The regulator supply for positive analog voltage reference
38
39 vref-n-supply:
40 description: |
41 The regulator supply for negative analog voltage reference
42 (Note that this must not go below GND or exceed vref-p)
43 If not specified, this is assumed to be analog ground.
44
45 ti,acquisition-time:
46 $ref: /schemas/types.yaml#/definitions/uint32
47 enum: [ 6, 10, 18, 34 ]
48 description: |
49 The number of conversion clock periods for the S/H's acquisition time.
50 For high source impedances, this value can be increased to 18 or 34.
51 For less ADC accuracy and/or slower CCLK frequencies this value may be
52 decreased to 6. See section 6.0 INPUT SOURCE RESISTANCE in the
53 datasheet for details.
54
55 "#io-channel-cells":
56 const: 1
57
58 required:
59 - compatible
60 - reg
61 - interrupts
62 - clocks
63 - vref-p-supply
64
65 additionalProperties: false
66
67 examples:
68 - |
69 #include <dt-bindings/interrupt-controller/irq.h>
70 spi {
71 #address-cells = <1>;
72 #size-cells = <0>;
73
74 adc@0 {
75 compatible = "ti,adc12138";
76 reg = <0>;
77 interrupts = <28 IRQ_TYPE_EDGE_RISING>;
78 interrupt-parent = <&gpio1>;
79 clocks = <&cclk>;
80 vref-p-supply = <&ldo4_reg>;
81 spi-max-frequency = <5000000>;
82 ti,acquisition-time = <6>;
83 #io-channel-cells = <1>;
84 };
85 };
86 ...
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