| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | |
| 8 | title: OLPC XO-1.75 Embedded Controller |
| 9 | |
| 10 | description: | |
| 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 | |
| 20 | maintainers: |
| 21 | - Lubomir Rintel <lkundrak@v3.sk> |
| 22 | |
| 23 | properties: |
| 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 | |
| 33 | required: |
| 34 | - compatible |
| 35 | - cmd-gpios |
| 36 | |
| 37 | additionalProperties: false |
| 38 | |
| 39 | examples: |
| 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 | ... |