dt-bindings: olpc,xo1.75-ec: Add OLPC XO-1.75 EC bindings (f22558d7) · Commits · 戴 / test

The OLPC XO-1.75 Embedded Controller is a SPI master that uses extra signals for handshaking. It needs to know when is the slave (Linux) side's TX FIFO ready for transfer (the ready-gpio signal on the SPI controller node) and when does it wish to respond with a command (the cmd-gpio property). Signed-off-by:

Lubomir Rintel <lkundrak@v3.sk> Acked-by:

Pavel Machek <pavel@ucw.cz> Reviewed-by:

Rob Herring <robh@kernel.org> Signed-off-by:

Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Documentation/devicetree/bindings/misc/olpc,xo1.75-ec.txt

0 → 100644

+23 −0

Original line number	Diff line number	Diff line
		OLPC XO-1.75 Embedded Controller

		Required properties:
		- compatible: Should be "olpc,xo1.75-ec".
		- cmd-gpios: gpio specifier of the CMD pin

		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/spi-pxa2xx.txt>.

		Example:
		&ssp3 {
		spi-slave;
		ready-gpios = <&gpio 125 GPIO_ACTIVE_HIGH>;

		slave {
		compatible = "olpc,xo1.75-ec";
		spi-cpha;
		cmd-gpios = <&gpio 155 GPIO_ACTIVE_HIGH>;
		};
		};

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