1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2 # Copyright (C) 2019,2020 Lubomir Rintel <lkundrak@v3.sk>
3 %YAML 1.2
4 ---
5 $id: http://devicetree.org/schemas/misc/olpc,xo1.75-ec.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
7
8 title: OLPC XO-1.75 Embedded Controller
9
10 description: |
11 This binding describes the Embedded Controller acting as a SPI bus master
12 on a OLPC XO-1.75 laptop computer.
13
14 The embedded controller requires the SPI controller driver to signal
15 readiness to receive a transfer (that is, when TX FIFO contains the
16 response data) by strobing the ACK pin with the ready signal. See the
17 "ready-gpios" property of the SSP binding as documented in:
18 <Documentation/devicetree/bindings/spi/marvell,mmp2-ssp.yaml>.
19
20 maintainers:
21 - Lubomir Rintel <lkundrak@v3.sk>
22
23 properties:
24 compatible:
25 const: olpc,xo1.75-ec
26
27 cmd-gpios:
28 description: GPIO uspecifier of the CMD pin
29 maxItems: 1
30
31 spi-cpha: true
32
33 required:
34 - compatible
35 - cmd-gpios
36
37 additionalProperties: false
38
39 examples:
40 - |
41 #include <dt-bindings/gpio/gpio.h>
42
43 spi {
44 spi-slave;
45 #address-cells = <0>;
46 #size-cells = <0>;
47 ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>;
48
49 slave {
50 compatible = "olpc,xo1.75-ec";
51 spi-cpha;
52 cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>;
53 };
54 };
55
56 ...
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