1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/spi/spi-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: SPI-GPIO
8
9 maintainers:
10 - Rob Herring <robh@kernel.org>
11
12 description:
13 This represents a group of 3-n GPIO lines used for bit-banged SPI on
14 dedicated GPIO lines.
15
16 allOf:
17 - $ref: /schemas/spi/spi-controller.yaml#
18
19 properties:
20 compatible:
21 const: spi-gpio
22
23 sck-gpios:
24 description: GPIO spec for the SCK line to use
25 maxItems: 1
26
27 miso-gpios:
28 description: GPIO spec for the MISO line to use
29 maxItems: 1
30
31 mosi-gpios:
32 description: GPIO spec for the MOSI line to use
33 maxItems: 1
34
35 cs-gpios:
36 description: GPIOs to use for chipselect lines.
37 Not needed if num-chipselects = <0>.
38 minItems: 1
39 maxItems: 1024
40
41 num-chipselects:
42 description: Number of chipselect lines. Should be <0> if a single device
43 with no chip select is connected.
44 $ref: /schemas/types.yaml#/definitions/uint32
45
46 # Deprecated properties
47 gpio-sck: false
48 gpio-miso: false
49 gpio-mosi: false
50
51 required:
52 - compatible
53 - num-chipselects
54 - sck-gpios
55
56 unevaluatedProperties: false
57
58 examples:
59 - |
60 spi {
61 compatible = "spi-gpio";
62 #address-cells = <0x1>;
63 #size-cells = <0x0>;
64
65 sck-gpios = <&gpio 95 0>;
66 miso-gpios = <&gpio 98 0>;
67 mosi-gpios = <&gpio 97 0>;
68 cs-gpios = <&gpio 125 0>;
69 num-chipselects = <1>;
70
71 /* clients */
72 };
73
74 ...
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