1 Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
2
3 Required 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
22 Optional 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
37 Supported 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
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_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 };
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