1 Broadcom Northstar plus (NSP) GPIO/PINCONF Con
2
3 Required properties:
4 - compatible:
5 Must be "brcm,nsp-gpio-a"
6
7 - reg:
8 Should contain the register physical addre
9 GPIO base, IO control registers
10
11 - #gpio-cells:
12 Must be two. The first cell is the GPIO pi
13 controller's pin space) and the second cel
14 bit[0]: polarity (0 for active high and 1
15
16 - gpio-controller:
17 Specifies that the node is a GPIO controll
18
19 - ngpios:
20 Number of gpios supported (58x25 supports
21
22 Optional properties:
23 - interrupts:
24 Interrupt ID
25
26 - interrupt-controller:
27 Specifies that the node is an interrupt co
28
29 - gpio-ranges:
30 Specifies the mapping between gpio control
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
36
37 Supported generic PINCONF properties in child
38 - pins:
39 The list of pins (within the controller's
40 in the node apply to. Pin names are "gpio-
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,
53
54 Example:
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_T
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 };
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