lantiq,gpio-mm-lantiq.yaml

 1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 2%YAML 1.2
 3---
 4$id: http://devicetree.org/schemas/lantiq,gpio-mm-lantiq.yaml#
 5$schema: http://devicetree.org/meta-schemas/core.yaml#
 6
 7title: Lantiq SoC External Bus memory mapped GPIO controller
 8
 9maintainers:
10  - John Crispin <john@phrozen.org>
11
12description: |
13  By attaching hardware latches to the EBU it is possible to create output
14  only gpios. This driver configures a special memory address, which when
15  written to outputs 16 bit to the latches.
16
17  The node describing the memory mapped GPIOs needs to be a child of the node
18  describing the "lantiq,localbus".
19
20properties:
21  compatible:
22    enum:
23      - lantiq,gpio-mm-lantiq
24      - lantiq,gpio-mm
25
26  reg:
27    maxItems: 1
28
29  '#gpio-cells':
30    const: 2
31
32  gpio-controller: true
33
34  lantiq,shadow:
35    description: The default value that we shall assume as already set on the shift register cascade.
36    $ref: /schemas/types.yaml#/definitions/uint32
37
38required:
39  - compatible
40  - reg
41  - '#gpio-cells'
42  - gpio-controller
43
44additionalProperties: false
45
46examples:
47  - |
48    gpio@4000000 {
49        compatible = "lantiq,gpio-mm-lantiq";
50        reg = <0x4000000 0x10>;
51        gpio-controller;
52        #gpio-cells = <2>;
53        lantiq,shadow = <0x77f>;
54    };