olpc,xo1.75-ec.yaml

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    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 bindings
    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 ...

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sys/contrib/device-tree/Bindings/misc/olpc,xo1.75-ec.yaml