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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/bus/ts-nbus.txt
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Technologic Systems NBUS

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

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Systems FPGA on the TS-4600 SoM.

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Required properties :

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 - compatible		: "technologic,ts-nbus"

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 - #address-cells	: must be 1

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 - #size-cells		: must be 0

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 - pwms			: The PWM bound to the FPGA

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

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

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

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

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

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

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Child nodes:

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

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on the bus.

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Example:

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	nbus {

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		compatible = "technologic,ts-nbus";

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		pinctrl-0 = <&nbus_pins>;

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		#address-cells = <1>;

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		#size-cells = <0>;

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		pwms = <&pwm 2 83>;

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		ts,data-gpios   = <&gpio0 0 GPIO_ACTIVE_HIGH

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				   &gpio0 1 GPIO_ACTIVE_HIGH

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				   &gpio0 2 GPIO_ACTIVE_HIGH

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				   &gpio0 3 GPIO_ACTIVE_HIGH

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				   &gpio0 4 GPIO_ACTIVE_HIGH

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				   &gpio0 5 GPIO_ACTIVE_HIGH

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				   &gpio0 6 GPIO_ACTIVE_HIGH

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				   &gpio0 7 GPIO_ACTIVE_HIGH>;

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

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

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

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

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

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		watchdog@2a {

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			compatible = "...";

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			/* ... */

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		};

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	};

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