xref: /linux/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml (revision a4eb44a6435d6d8f9e642407a4a06f65eb90ca04) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/gpio/fairchild,74hc595.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Generic 8-bit shift register
8
9maintainers:
10  - Maxime Ripard <mripard@kernel.org>
11
12properties:
13  compatible:
14    enum:
15      - fairchild,74hc595
16      - nxp,74lvc594
17
18  reg:
19    maxItems: 1
20
21  gpio-controller: true
22
23  '#gpio-cells':
24    description:
25      The second cell is only used to specify the GPIO polarity.
26    const: 2
27
28  registers-number:
29    description: Number of daisy-chained shift registers
30
31  enable-gpios:
32    description: GPIO connected to the OE (Output Enable) pin.
33    maxItems: 1
34
35  spi-max-frequency: true
36
37patternProperties:
38  "^(hog-[0-9]+|.+-hog(-[0-9]+)?)$":
39    type: object
40
41    properties:
42      gpio-hog: true
43      gpios: true
44      output-high: true
45      output-low: true
46      line-name: true
47
48    required:
49      - gpio-hog
50      - gpios
51
52    additionalProperties: false
53
54required:
55  - compatible
56  - reg
57  - gpio-controller
58  - '#gpio-cells'
59  - registers-number
60
61additionalProperties: false
62
63examples:
64  - |
65    spi {
66            #address-cells = <1>;
67            #size-cells = <0>;
68
69            gpio5: gpio5@0 {
70                    compatible = "fairchild,74hc595";
71                    reg = <0>;
72                    gpio-controller;
73                    #gpio-cells = <2>;
74                    registers-number = <4>;
75                    spi-max-frequency = <100000>;
76            };
77    };
78