57 lines
1.3 KiB
YAML
57 lines
1.3 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
|
|
# Copyright (C) 2019,2020 Lubomir Rintel <lkundrak@v3.sk>
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/misc/olpc,xo1.75-ec.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: OLPC XO-1.75 Embedded Controller bindings
|
|
|
|
description: |
|
|
This binding describes the Embedded Controller acting as a SPI bus master
|
|
on a OLPC XO-1.75 laptop computer.
|
|
|
|
The embedded controller requires the SPI controller driver to signal
|
|
readiness to receive a transfer (that is, when TX FIFO contains the
|
|
response data) by strobing the ACK pin with the ready signal. See the
|
|
"ready-gpios" property of the SSP binding as documented in:
|
|
<Documentation/devicetree/bindings/spi/marvell,mmp2-ssp.yaml>.
|
|
|
|
maintainers:
|
|
- Lubomir Rintel <lkundrak@v3.sk>
|
|
|
|
properties:
|
|
compatible:
|
|
const: olpc,xo1.75-ec
|
|
|
|
cmd-gpios:
|
|
description: GPIO uspecifier of the CMD pin
|
|
maxItems: 1
|
|
|
|
spi-cpha: true
|
|
|
|
required:
|
|
- compatible
|
|
- cmd-gpios
|
|
|
|
additionalProperties: false
|
|
|
|
examples:
|
|
- |
|
|
#include <dt-bindings/gpio/gpio.h>
|
|
|
|
spi {
|
|
spi-slave;
|
|
#address-cells = <0>;
|
|
#size-cells = <0>;
|
|
ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>;
|
|
|
|
slave {
|
|
compatible = "olpc,xo1.75-ec";
|
|
spi-cpha;
|
|
cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>;
|
|
};
|
|
};
|
|
|
|
...
|