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* Synopsys DesignWare APB GPIO controller
Required properties:
- compatible : Should contain "snps,dw-apb-gpio"
- reg : Address and length of the register set for the device.
- #address-cells : should be 1 (for addressing port subnodes).
- #size-cells : should be 0 (port subnodes).
The GPIO controller has a configurable number of ports, each of which are
represented as child nodes with the following properties:
Required properties:
- compatible : "snps,dw-apb-gpio-port"
- gpio-controller : Marks the device node as a gpio controller.
- #gpio-cells : Should be two. The first cell is the pin number and
the second cell is used to specify the gpio polarity:
0 = active high
1 = active low
- reg : The integer port index of the port, a single cell.
Optional properties:
- interrupt-controller : The first port may be configured to be an interrupt
controller.
- #interrupt-cells : Specifies the number of cells needed to encode an
interrupt. Shall be set to 2. The first cell defines the interrupt number,
the second encodes the triger flags encoded as described in
Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
- interrupts : The interrupts to the parent controller raised when GPIOs
generate the interrupts. If the controller provides one combined interrupt
for all GPIOs, specify a single interrupt. If the controller provides one
interrupt for each GPIO, provide a list of interrupts that correspond to each
of the GPIO pins. When specifying multiple interrupts, if any are unconnected,
use the interrupts-extended property to specify the interrupts and set the
interrupt controller handle for unused interrupts to 0.
- snps,nr-gpios : The number of pins in the port, a single cell.
- resets : Reset line for the controller.
Example:
gpio: gpio@20000 {
compatible = "snps,dw-apb-gpio";
reg = <0x20000 0x1000>;
#address-cells = <1>;
#size-cells = <0>;
porta: gpio-controller@0 {
compatible = "snps,dw-apb-gpio-port";
gpio-controller;
#gpio-cells = <2>;
snps,nr-gpios = <8>;
reg = <0>;
interrupt-controller;
#interrupt-cells = <2>;
interrupt-parent = <&vic1>;
interrupts = <0>;
};
portb: gpio-controller@1 {
compatible = "snps,dw-apb-gpio-port";
gpio-controller;
#gpio-cells = <2>;
snps,nr-gpios = <8>;
reg = <1>;
};
};
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