mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 04:11:49 +00:00
2dffad825f
Document the GPIO/PINCONF device tree binding for Broadcom Cygnus SoC Signed-off-by: Ray Jui <rjui@broadcom.com> Reviewed-by: Scott Branden <sbranden@broadcom.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
99 lines
2.1 KiB
Plaintext
99 lines
2.1 KiB
Plaintext
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
|
|
|
|
- pinmux:
|
|
Specifies the phandle to the IOMUX device, where pins can be individually
|
|
muxed to GPIO
|
|
|
|
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;
|
|
};
|
|
|
|
/*
|
|
* 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>
|
|
}
|