0001 Aspeed GPIO controller Device Tree Bindings
0002 -------------------------------------------
0003
0004 Required properties:
0005 - compatible : Either "aspeed,ast2400-gpio", "aspeed,ast2500-gpio",
0006 or "aspeed,ast2600-gpio".
0007
0008 - #gpio-cells : Should be two
0009 - First cell is the GPIO line number
0010 - Second cell is used to specify optional
0011 parameters (unused)
0012
0013 - reg : Address and length of the register set for the device
0014 - gpio-controller : Marks the device node as a GPIO controller.
0015 - interrupts : Interrupt specifier (see interrupt bindings for
0016 details)
0017 - interrupt-controller : Mark the GPIO controller as an interrupt-controller
0018
0019 Optional properties:
0020
0021 - clocks : A phandle to the clock to use for debounce timings
0022 - ngpios : Number of GPIOs controlled by this controller. Should be set
0023 when there are multiple GPIO controllers on a SoC (ast2600).
0024
0025 The gpio and interrupt properties are further described in their respective
0026 bindings documentation:
0027
0028 - Documentation/devicetree/bindings/gpio/gpio.txt
0029 - Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
0030
0031 Example:
0032 gpio@1e780000 {
0033 #gpio-cells = <2>;
0034 compatible = "aspeed,ast2400-gpio";
0035 gpio-controller;
0036 interrupts = <20>;
0037 reg = <0x1e780000 0x1000>;
0038 interrupt-controller;
0039 };
