1Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
2
3Required properties:
4- compatible:
5    Must be "brcm,nsp-gpio-a"
6
7- reg:
8    Should contain the register physical address and length for each of
9    GPIO base, IO control registers
10
11- #gpio-cells:
12    Must be two. The first cell is the GPIO pin number (within the
13    controller's pin space) and the second cell is used for the following:
14    bit[0]: polarity (0 for active high and 1 for active low)
15
16- gpio-controller:
17    Specifies that the node is a GPIO controller
18
19- ngpios:
20    Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
21
22Optional properties:
23- interrupts:
24    Interrupt ID
25
26- interrupt-controller:
27    Specifies that the node is an interrupt controller
28
29- gpio-ranges:
30    Specifies the mapping between gpio controller and pin-controllers pins.
31    This requires 4 fields in cells defined as -
32    1. Phandle of pin-controller.
33    2. GPIO base pin offset.
34    3  Pin-control base pin offset.
35    4. number of gpio pins which are linearly mapped from pin base.
36
37Supported generic PINCONF properties in child nodes:
38- pins:
39    The list of pins (within the controller's own pin space) that properties
40    in the node apply to. Pin names are "gpio-<pin>"
41
42- bias-disable:
43    Disable pin bias
44
45- bias-pull-up:
46    Enable internal pull up resistor
47
48- bias-pull-down:
49    Enable internal pull down resistor
50
51- drive-strength:
52    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
53
54Example:
55
56	gpioa: gpio@18000020 {
57		compatible = "brcm,nsp-gpio-a";
58		reg = <0x18000020 0x100>,
59		      <0x1803f1c4 0x1c>;
60		#gpio-cells = <2>;
61		gpio-controller;
62		ngpios = <32>;
63		gpio-ranges = <&pinctrl 0 0 31>;
64		interrupt-controller;
65		interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
66
67		/* Hog a few default settings */
68		pinctrl-names = "default";
69		pinctrl-0 = <&led>;
70		led: led {
71			pins = "gpio-1";
72			bias-pull-up;
73		};
74
75		pwr: pwr {
76			gpio-hog;
77			gpios = <3 1>;
78			output-high;
79		};
80	};
81