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2 GPIO configuration.
5 1. Properties for GPIO Controllers
7 1.1 #gpio-cells
9 Property:	#gpio-cells
13 Description:	The #gpio-cells property defines the number of cells required
14 		to encode a gpio specifier.
17 1.2 gpio-controller
19 Property:	gpio-controller
23 Description:	The presence of a gpio-controller property defines a node as a
24 		GPIO controller node.
27 1.3 pin-count
29 Property:	pin-count
33 Description:	The pin-count property defines the number of GPIO pins.
38 	GPIO: gpio@10100 {
39 		#gpio-cells = <3>;
40 		compatible = "mrvl,gpio";
42 		gpio-controller;
44 		interrupt-parent = <&PIC>;
45 		pin-count = <50>
48 2. Properties for GPIO consumer nodes.
54 Value type:	<prop-encoded-array> encoded as arbitrary number of GPIO
57 Description:	The gpios property of a device node defines the GPIO or GPIOs
59 		consists of an arbitrary number of GPIO specifiers.
61 		The first cell of the GPIO specifier is phandle of the node's
62 		parent GPIO controller and remaining cells are defined by the
63 		binding describing the GPIO parent, typically include
67 		gpios = <&GPIO 0 1		/* GPIO[0]:  FLAGS */
68 			 &GPIO 1 2>;		/* GPIO[1]:  FLAGS */
71 3. GPIO controller specifier
76 pin:	0-MAX				GPIO pin number.
81 	to controller's GPIO reference manual.
85 	GPIO_PIN_OPENDRAIN	0x0004	Open-drain output
86 	GPIO_PIN_OPENSOURCE	0x0008	Open-source output
87 	GPIO_PIN_PUSHPULL	0x0010	Push-pull output
89 	GPIO_PIN_PULLUP		0x0040	Internal pull-up enabled
90 	GPIO_PIN_PULLDOWN	0x0080	Internal pull-down enabled
100 	gpios = <&GPIO 0  0x00000001	/* GPIO[0]:   IN */
101 		 &GPIO 1  0x00000002	/* GPIO[1]:   OUT */
102 		 &GPIO 2  0x00000801	/* GPIO[2]:   IN, IRQ (edge) */
103 		 &GPIO 3  0x00004001	/* GPIO[3]:   IN, IRQ (level) */
105 		 &GPIO 10 0x00000401>;	/* GPIO[10]:  OUT, blink */