tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
8title: OLPC XO-1.75 Embedded Controller bindings
9
10description: |
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
20maintainers:
21 - Lubomir Rintel <lkundrak@v3.sk>
22
23properties:
24 compatible:
25 const: olpc,xo1.75-ec
26
27 cmd-gpios:
28 description: GPIO uspecifier of the CMD pin
29 maxItems: 1
30
31required:
32 - compatible
33 - cmd-gpios
34
35unevaluatedProperties: false
36
37examples:
38 - |
39 #include <dt-bindings/gpio/gpio.h>
40
41 spi {
42 spi-slave;
43 ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>;
44
45 slave {
46 compatible = "olpc,xo1.75-ec";
47 spi-cpha;
48 cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>;
49 };
50 };
51
52...