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# 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>;
};
};
...
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