a54aef5072
The example uses gpio-cells = 1 while it should be two (it is even mentioned in the text above). Cc: devicetree@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
61 lines
1.8 KiB
Plaintext
61 lines
1.8 KiB
Plaintext
* 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/interrupts.txt
|
|
- interrupt-parent : The parent interrupt controller.
|
|
- interrupts : The interrupt to the parent controller raised when GPIOs
|
|
generate the interrupts.
|
|
- snps,nr-gpios : The number of pins in the port, a single cell.
|
|
|
|
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>;
|
|
};
|
|
};
|