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1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
2 | %YAML 1.2 | |
3 | --- | |
4 | $id: http://devicetree.org/schemas/gpio/nxp,pcf8575.yaml# | |
5 | $schema: http://devicetree.org/meta-schemas/core.yaml# | |
6 | ||
7 | title: PCF857x-compatible I/O expanders | |
8 | ||
9 | maintainers: | |
10 | - Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | |
11 | ||
12 | description: | |
13 | The PCF857x-compatible chips have "quasi-bidirectional" I/O lines that can be | |
14 | driven high by a pull-up current source or driven low to ground. This | |
15 | combines the direction and output level into a single bit per line, which | |
16 | can't be read back. We can't actually know at initialization time whether a | |
17 | line is configured (a) as output and driving the signal low/high, or (b) as | |
18 | input and reporting a low/high value, without knowing the last value written | |
19 | since the chip came out of reset (if any). The only reliable solution for | |
20 | setting up line direction is thus to do it explicitly. | |
21 | ||
22 | properties: | |
23 | compatible: | |
24 | enum: | |
25 | - maxim,max7328 | |
26 | - maxim,max7329 | |
27 | - nxp,pca8574 | |
28 | - nxp,pca8575 | |
29 | - nxp,pca9670 | |
30 | - nxp,pca9671 | |
31 | - nxp,pca9672 | |
32 | - nxp,pca9673 | |
33 | - nxp,pca9674 | |
34 | - nxp,pca9675 | |
35 | - nxp,pcf8574 | |
36 | - nxp,pcf8574a | |
37 | - nxp,pcf8575 | |
38 | ||
39 | reg: | |
40 | maxItems: 1 | |
41 | ||
dc3c7404 TW |
42 | gpio-line-names: |
43 | minItems: 1 | |
44 | maxItems: 16 | |
45 | ||
d766dfee GU |
46 | gpio-controller: true |
47 | ||
48 | '#gpio-cells': | |
49 | const: 2 | |
50 | description: | |
51 | The first cell is the GPIO number and the second cell specifies GPIO | |
52 | flags, as defined in <dt-bindings/gpio/gpio.h>. Only the GPIO_ACTIVE_HIGH | |
53 | and GPIO_ACTIVE_LOW flags are supported. | |
54 | ||
55 | lines-initial-states: | |
56 | $ref: /schemas/types.yaml#/definitions/uint32 | |
57 | description: | |
58 | Bitmask that specifies the initial state of each line. | |
59 | When a bit is set to zero, the corresponding line will be initialized to | |
60 | the input (pulled-up) state. | |
61 | When the bit is set to one, the line will be initialized to the | |
62 | low-level output state. | |
63 | If the property is not specified all lines will be initialized to the | |
64 | input state. | |
65 | ||
66 | interrupts: | |
67 | maxItems: 1 | |
68 | ||
69 | interrupt-controller: true | |
70 | ||
71 | '#interrupt-cells': | |
72 | const: 2 | |
73 | ||
74 | wakeup-source: true | |
75 | ||
76 | patternProperties: | |
77 | "^(.+-hog(-[0-9]+)?)$": | |
78 | type: object | |
79 | ||
80 | required: | |
81 | - gpio-hog | |
82 | ||
83 | required: | |
84 | - compatible | |
85 | - reg | |
86 | - gpio-controller | |
87 | - '#gpio-cells' | |
88 | ||
89 | additionalProperties: false | |
90 | ||
91 | examples: | |
92 | - | | |
93 | i2c { | |
94 | #address-cells = <1>; | |
95 | #size-cells = <0>; | |
96 | ||
97 | pcf8575: gpio@20 { | |
98 | compatible = "nxp,pcf8575"; | |
99 | reg = <0x20>; | |
100 | interrupt-parent = <&irqpin2>; | |
101 | interrupts = <3 0>; | |
102 | gpio-controller; | |
103 | #gpio-cells = <2>; | |
104 | interrupt-controller; | |
105 | #interrupt-cells = <2>; | |
106 | }; | |
107 | }; |