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Broadcom Cygnus GPIO/PINCONF Controller
Required properties:
- compatible:
Must be "brcm,cygnus-ccm-gpio", "brcm,cygnus-asiu-gpio", or
"brcm,cygnus-crmu-gpio"
- reg:
Define the base and range of the I/O address space that contains the Cygnus
GPIO/PINCONF controller 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
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:
gpio_ccm: gpio@1800a000 {
compatible = "brcm,cygnus-ccm-gpio";
reg = <0x1800a000 0x50>,
<0x0301d164 0x20>;
#gpio-cells = <2>;
gpio-controller;
interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>;
interrupt-controller;
touch_pins: touch_pins {
pwr: pwr {
pins = "gpio-0";
drive-strength = <16>;
};
event: event {
pins = "gpio-1";
bias-pull-up;
};
};
};
gpio_asiu: gpio@180a5000 {
compatible = "brcm,cygnus-asiu-gpio";
reg = <0x180a5000 0x668>;
#gpio-cells = <2>;
gpio-controller;
interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
interrupt-controller;
gpio-ranges = <&pinctrl 0 42 1>,
<&pinctrl 1 44 3>;
};
/*
* Touchscreen that uses the CCM GPIO 0 and 1
*/
tsc {
...
...
gpio-pwr = <&gpio_ccm 0 0>;
gpio-event = <&gpio_ccm 1 0>;
};
/* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */
bluetooth {
...
...
bcm,rfkill-bank-sel = <&gpio_asiu 5 1>
}
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