1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause 2*4882a593Smuzhiyun# Copyright (C) 2019,2020 Lubomir Rintel <lkundrak@v3.sk> 3*4882a593Smuzhiyun%YAML 1.2 4*4882a593Smuzhiyun--- 5*4882a593Smuzhiyun$id: http://devicetree.org/schemas/misc/olpc,xo1.75-ec.yaml# 6*4882a593Smuzhiyun$schema: http://devicetree.org/meta-schemas/core.yaml# 7*4882a593Smuzhiyun 8*4882a593Smuzhiyuntitle: OLPC XO-1.75 Embedded Controller bindings 9*4882a593Smuzhiyun 10*4882a593Smuzhiyundescription: | 11*4882a593Smuzhiyun This binding describes the Embedded Controller acting as a SPI bus master 12*4882a593Smuzhiyun on a OLPC XO-1.75 laptop computer. 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun The embedded controller requires the SPI controller driver to signal 15*4882a593Smuzhiyun readiness to receive a transfer (that is, when TX FIFO contains the 16*4882a593Smuzhiyun response data) by strobing the ACK pin with the ready signal. See the 17*4882a593Smuzhiyun "ready-gpios" property of the SSP binding as documented in: 18*4882a593Smuzhiyun <Documentation/devicetree/bindings/spi/marvell,mmp2-ssp.yaml>. 19*4882a593Smuzhiyun 20*4882a593Smuzhiyunmaintainers: 21*4882a593Smuzhiyun - Lubomir Rintel <lkundrak@v3.sk> 22*4882a593Smuzhiyun 23*4882a593Smuzhiyunproperties: 24*4882a593Smuzhiyun compatible: 25*4882a593Smuzhiyun const: olpc,xo1.75-ec 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun cmd-gpios: 28*4882a593Smuzhiyun description: GPIO uspecifier of the CMD pin 29*4882a593Smuzhiyun maxItems: 1 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun spi-cpha: true 32*4882a593Smuzhiyun 33*4882a593Smuzhiyunrequired: 34*4882a593Smuzhiyun - compatible 35*4882a593Smuzhiyun - cmd-gpios 36*4882a593Smuzhiyun 37*4882a593SmuzhiyunadditionalProperties: false 38*4882a593Smuzhiyun 39*4882a593Smuzhiyunexamples: 40*4882a593Smuzhiyun - | 41*4882a593Smuzhiyun #include <dt-bindings/gpio/gpio.h> 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun spi { 44*4882a593Smuzhiyun spi-slave; 45*4882a593Smuzhiyun #address-cells = <0>; 46*4882a593Smuzhiyun #size-cells = <0>; 47*4882a593Smuzhiyun ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>; 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun slave { 50*4882a593Smuzhiyun compatible = "olpc,xo1.75-ec"; 51*4882a593Smuzhiyun spi-cpha; 52*4882a593Smuzhiyun cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>; 53*4882a593Smuzhiyun }; 54*4882a593Smuzhiyun }; 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun... 57