1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: GPIO bitbanged I2C
8
9 maintainers:
10 - Wolfram Sang <wsa@kernel.org>
11
12 allOf:
13 - $ref: /schemas/i2c/i2c-controller.yaml#
14
15 properties:
16 compatible:
17 items:
18 - const: i2c-gpio
19
20 sda-gpios:
21 description:
22 gpio used for the sda signal, this should be flagged as
23 active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
24 from <dt-bindings/gpio/gpio.h> since the signal is by definition
25 open drain.
26 maxItems: 1
27
28 scl-gpios:
29 description:
30 gpio used for the scl signal, this should be flagged as
31 active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
32 from <dt-bindings/gpio/gpio.h> since the signal is by definition
33 open drain.
34 maxItems: 1
35
36 i2c-gpio,sda-output-only:
37 description: sda as output only
38 type: boolean
39
40 i2c-gpio,scl-output-only:
41 description: scl as output only
42 type: boolean
43
44 i2c-gpio,delay-us:
45 description: delay between GPIO operations (may depend on each platform)
46
47 i2c-gpio,timeout-ms:
48 description: timeout to get data
49
50 # Deprecated properties, do not use in new device tree sources:
51 gpios:
52 minItems: 2
53 maxItems: 2
54 description: sda and scl gpio, alternative for {sda,scl}-gpios
55
56 i2c-gpio,sda-open-drain:
57 type: boolean
58 deprecated: true
59 description: this means that something outside of our control has put
60 the GPIO line used for SDA into open drain mode, and that something is
61 not the GPIO chip. It is essentially an inconsistency flag.
62
63 i2c-gpio,scl-open-drain:
64 type: boolean
65 deprecated: true
66 description: this means that something outside of our control has put the
67 GPIO line used for SCL into open drain mode, and that something is not
68 the GPIO chip. It is essentially an inconsistency flag.
69
70 i2c-gpio,sda-has-no-pullup:
71 type: boolean
72 description: sda is used in a non-compliant way and has no pull-up.
73 Therefore disable open-drain. This property is mutually-exclusive
74 with i2c-gpio,sda-open-drain.
75
76 i2c-gpio,scl-has-no-pullup:
77 type: boolean
78 description: scl is used in a non-compliant way and has no pull-up.
79 Therefore disable open-drain. This property is mutually-exclusive
80 with i2c-gpio,scl-open-drain.
81
82 dependencies:
83 i2c-gpio,sda-has-no-pullup:
84 not:
85 required:
86 - i2c-gpio,sda-open-drain
87 i2c-gpio,scl-has-no-pullup:
88 not:
89 required:
90 - i2c-gpio,scl-open-drain
91
92 required:
93 - compatible
94 - sda-gpios
95 - scl-gpios
96
97 unevaluatedProperties: false
98
99 ...
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.