xref: /linux/Documentation/devicetree/bindings/iio/adc/ti,adc12138.yaml (revision a4eb44a6435d6d8f9e642407a4a06f65eb90ca04) 
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
7title: Texas Instruments ADC12138 and similar self-calibrating ADCs
8
9maintainers:
10  - Akinobu Mita <akinobu.mita@gmail.com>
11
12description: |
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
16properties:
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
58required:
59  - compatible
60  - reg
61  - interrupts
62  - clocks
63  - vref-p-supply
64
65additionalProperties: false
66
67examples:
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...
87