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1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause2# Copyright (C) 2019,2020 Lubomir Rintel <lkundrak@v3.sk>3%YAML 1.24---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 Controller9 10description: |11 This binding describes the Embedded Controller acting as a SPI bus master12 on a OLPC XO-1.75 laptop computer.13 14 The embedded controller requires the SPI controller driver to signal15 readiness to receive a transfer (that is, when TX FIFO contains the16 response data) by strobing the ACK pin with the ready signal. See the17 "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-ec26 27 cmd-gpios:28 description: GPIO uspecifier of the CMD pin29 maxItems: 130 31 spi-cpha: true32 33required:34 - compatible35 - cmd-gpios36 37additionalProperties: false38 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