diff options
Diffstat (limited to 'Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml')
| -rw-r--r-- | Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml new file mode 100644 index 000000000..b3c45c046 --- /dev/null +++ b/Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.yaml @@ -0,0 +1,56 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +# Copyright (C) 2019,2020 Lubomir Rintel <lkundrak@v3.sk> +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/misc/olpc,xo1.75-ec.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: OLPC XO-1.75 Embedded Controller bindings + +description: | + This binding describes the Embedded Controller acting as a SPI bus master + on a OLPC XO-1.75 laptop computer. + + The embedded controller requires the SPI controller driver to signal + readiness to receive a transfer (that is, when TX FIFO contains the + response data) by strobing the ACK pin with the ready signal. See the + "ready-gpios" property of the SSP binding as documented in: + <Documentation/devicetree/bindings/spi/marvell,mmp2-ssp.yaml>. + +maintainers: + - Lubomir Rintel <lkundrak@v3.sk> + +properties: + compatible: + const: olpc,xo1.75-ec + + cmd-gpios: + description: GPIO uspecifier of the CMD pin + maxItems: 1 + + spi-cpha: true + +required: + - compatible + - cmd-gpios + +additionalProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + + spi { + spi-slave; + #address-cells = <0>; + #size-cells = <0>; + ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>; + + slave { + compatible = "olpc,xo1.75-ec"; + spi-cpha; + cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>; + }; + }; + +... |