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 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 31 spi-cpha: true 32 33required: 34 - compatible 35 - cmd-gpios 36 37additionalProperties: false 38 39examples: 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... 57