6 1. Properties for GPIO Controllers
14 Description: The #gpio-cells property defines the number of cells required
15 to encode a gpio specifier.
20 Property: gpio-controller
24 Description: The presence of a gpio-controller property defines a node as a
34 Description: The pin-count property defines the number of GPIO pins.
41 compatible = "mrvl,gpio";
44 interrupts = <6 7 8 9>;
45 interrupt-parent = <&PIC>;
49 2. Properties for GPIO consumer nodes.
55 Value type: <prop-encoded-array> encoded as arbitrary number of GPIO
58 Description: The gpios property of a device node defines the GPIO or GPIOs
59 that are used by the device. The value of the gpios property
60 consists of an arbitrary number of GPIO specifiers.
62 The first cell of the GPIO specifier is phandle of the node's
63 parent GPIO controller and remaining cells are defined by the
64 binding describing the GPIO parent, typically include
65 information like pin number, direction and various flags.
68 gpios = <&GPIO 0 1 /* GPIO[0]: FLAGS */
69 &GPIO 1 2>; /* GPIO[1]: FLAGS */
72 3. GPIO controller specifier
74 <phandle pin dir flags>
77 pin: 0-MAX GPIO pin number.
80 Available flags are listed in sys/conf.h. Following combination
81 can be supported by the controller. For details please refer
82 to controller's GPIO reference manual.
84 GPIO_PIN_INPUT 0x0001 Input direction
85 GPIO_PIN_OUTPUT 0x0002 Output direction
86 GPIO_PIN_OPENDRAIN 0x0004 Open-drain output
87 GPIO_PIN_OPENSOURCE 0x0008 Open-source output
88 GPIO_PIN_PUSHPULL 0x0010 Push-pull output
89 GPIO_PIN_TRISTATE 0x0020 Output disabled
90 GPIO_PIN_PULLUP 0x0040 Internal pull-up enabled
91 GPIO_PIN_PULLDOWN 0x0080 Internal pull-down enabled
92 GPIO_PIN_INVIN 0x0100 Invert input
93 GPIO_PIN_INVOUT 0x0200 Invert output
94 GPIO_PIN_PULSATE 0x0400 Pulsate in hardware
95 GPIO_PIN_IRQ_POL_EDG 0x0800 IRQ active single edge
96 GPIO_PIN_IRQ_POL_DBL 0x1000 IRQ active double edge
97 GPIO_PIN_IRQ_POL_LVL 0x2000 IRQ active level
98 GPIO_PIN_IRQ_DEBOUNCE 0x4000 Debounce on IRQ pin
101 gpios = <&GPIO 0 0x00000001 /* GPIO[0]: IN */
102 &GPIO 1 0x00000002 /* GPIO[1]: OUT */
103 &GPIO 2 0x00000801 /* GPIO[2]: IN, IRQ (edge) */
104 &GPIO 3 0x00004001 /* GPIO[3]: IN, IRQ (level) */
106 &GPIO 10 0x00000401>; /* GPIO[10]: OUT, blink */