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+Altera GPIO controller bindings
+
+Required properties:
+- compatible:
+ - "altr,pio-1.0"
+- reg: Physical base address and length of the controller's registers.
+- #gpio-cells : Should be 2
+ - The first cell is the gpio offset number.
+ - The second cell is reserved and is currently unused.
+- gpio-controller : Marks the device node as a GPIO controller.
+- interrupt-controller: Mark the device node as an interrupt controller
+- #interrupt-cells : Should be 2. The interrupt type is fixed in the hardware.
+ - The first cell is the GPIO offset number within the GPIO controller.
+ - The second cell is the interrupt trigger type and level flags.
+- interrupts: Specify the interrupt.
+- altr,interrupt-type: Specifies the interrupt trigger type the GPIO
+ hardware is synthesized. This field is required if the Altera GPIO controller
+ used has IRQ enabled as the interrupt type is not software controlled,
+ but hardware synthesized. Required if GPIO is used as an interrupt
+ controller. The value is defined in <dt-bindings/interrupt-controller/irq.h>
+ Only the following flags are supported:
+ IRQ_TYPE_EDGE_RISING
+ IRQ_TYPE_EDGE_FALLING
+ IRQ_TYPE_EDGE_BOTH
+ IRQ_TYPE_LEVEL_HIGH
+
+Optional properties:
+- altr,ngpio: Width of the GPIO bank. This defines how many pins the
+ GPIO device has. Ranges between 1-32. Optional and defaults to 32 if not
+ specified.
+
+Example:
+
+gpio_altr: gpio@ff200000 {
+ compatible = "altr,pio-1.0";
+ reg = <0xff200000 0x10>;
+ interrupts = <0 45 4>;
+ altr,ngpio = <32>;
+ altr,interrupt-type = <IRQ_TYPE_EDGE_RISING>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ #interrupt-cells = <2>;
+ interrupt-controller;
+};