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Commit ec473a9c authored by Sebastien Bourdelin's avatar Sebastien Bourdelin Committed by Arnd Bergmann
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dt-bindings: bus: Add documentation for the Technologic Systems NBUS 



Add binding documentation for the Technologic Systems NBUS that is used
to interface with peripherals in the FPGA of the TS-4600 SoM.

Signed-off-by: default avatarSebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 1e11cbf7

Documentation/devicetree/bindings/bus/ts-nbus.txt

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Technologic Systems NBUS



The NBUS is a bus used to interface with peripherals in the Technologic

Systems FPGA on the TS-4600 SoM.



Required properties :

 - compatible		: "technologic,ts-nbus"

 - #address-cells	: must be 1

 - #size-cells		: must be 0

 - pwms			: The PWM bound to the FPGA

 - ts,data-gpios	: The 8 GPIO pins connected to the data lines on the FPGA

 - ts,csn-gpios		: The GPIO pin connected to the csn line on the FPGA

 - ts,txrx-gpios	: The GPIO pin connected to the txrx line on the FPGA

 - ts,strobe-gpios	: The GPIO pin connected to the stobe line on the FPGA

 - ts,ale-gpios		: The GPIO pin connected to the ale line on the FPGA

 - ts,rdy-gpios		: The GPIO pin connected to the rdy line on the FPGA



Child nodes:



The NBUS node can contain zero or more child nodes representing peripherals

on the bus.



Example:



	nbus {

		compatible = "technologic,ts-nbus";

		pinctrl-0 = <&nbus_pins>;

		#address-cells = <1>;

		#size-cells = <0>;

		pwms = <&pwm 2 83>;

		ts,data-gpios   = <&gpio0 0 GPIO_ACTIVE_HIGH

				   &gpio0 1 GPIO_ACTIVE_HIGH

				   &gpio0 2 GPIO_ACTIVE_HIGH

				   &gpio0 3 GPIO_ACTIVE_HIGH

				   &gpio0 4 GPIO_ACTIVE_HIGH

				   &gpio0 5 GPIO_ACTIVE_HIGH

				   &gpio0 6 GPIO_ACTIVE_HIGH

				   &gpio0 7 GPIO_ACTIVE_HIGH>;

		ts,csn-gpios    = <&gpio0 16 GPIO_ACTIVE_HIGH>;

		ts,txrx-gpios   = <&gpio0 24 GPIO_ACTIVE_HIGH>;

		ts,strobe-gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;

		ts,ale-gpios    = <&gpio0 26 GPIO_ACTIVE_HIGH>;

		ts,rdy-gpios    = <&gpio0 21 GPIO_ACTIVE_HIGH>;



		watchdog@2a {

			compatible = "...";



			/* ... */

		};

	};