81 lines · plain
1Broadcom Northstar plus (NSP) GPIO/PINCONF Controller2 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 of9 GPIO base, IO control registers10 11- #gpio-cells:12 Must be two. The first cell is the GPIO pin number (within the13 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 controller18 19- ngpios:20 Number of gpios supported (58x25 supports 32 and 58x23 supports 24)21 22Optional properties:23- interrupts:24 Interrupt ID25 26- interrupt-controller:27 Specifies that the node is an interrupt controller28 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 properties40 in the node apply to. Pin names are "gpio-<pin>"41 42- bias-disable:43 Disable pin bias44 45- bias-pull-up:46 Enable internal pull up resistor47 48- bias-pull-down:49 Enable internal pull down resistor50 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