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| -rw-r--r-- | Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt new file mode 100644 index 000000000000..0844168a6dd4 --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt @@ -0,0 +1,80 @@ +Broadcom Northstar plus (NSP) GPIO/PINCONF Controller + +Required properties: +- compatible: + Must be "brcm,nsp-gpio-a" + +- reg: + Should contain the register physical address and length for each of + GPIO base, IO control registers + +- #gpio-cells: + Must be two. The first cell is the GPIO pin number (within the + controller's pin space) and the second cell is used for the following: + bit[0]: polarity (0 for active high and 1 for active low) + +- gpio-controller: + Specifies that the node is a GPIO controller + +- ngpios: + Number of gpios supported (58x25 supports 32 and 58x23 supports 24) + +Optional properties: +- interrupts: + Interrupt ID + +- interrupt-controller: + Specifies that the node is an interrupt controller + +- gpio-ranges: + Specifies the mapping between gpio controller and pin-controllers pins. + This requires 4 fields in cells defined as - + 1. Phandle of pin-controller. + 2. GPIO base pin offset. + 3 Pin-control base pin offset. + 4. number of gpio pins which are linearly mapped from pin base. + +Supported generic PINCONF properties in child nodes: +- pins: + The list of pins (within the controller's own pin space) that properties + in the node apply to. Pin names are "gpio-<pin>" + +- bias-disable: + Disable pin bias + +- bias-pull-up: + Enable internal pull up resistor + +- bias-pull-down: + Enable internal pull down resistor + +- drive-strength: + Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA) + +Example: + + gpioa: gpio@18000020 { + compatible = "brcm,nsp-gpio-a"; + reg = <0x18000020 0x100>, + <0x1803f1c4 0x1c>; + #gpio-cells = <2>; + gpio-controller; + ngpios = <32>; + gpio-ranges = <&pinctrl 0 0 31>; + interrupt-controller; + interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>; + + /* Hog a few default settings */ + pinctrl-names = "default"; + pinctrl-0 = <&led>; + led: led { + pins = "gpio-1"; + bias-pull-up; + }; + + pwr: pwr { + gpio-hog; + gpios = <3 1>; + output-high; + }; + }; |