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