0001 Altera GPIO controller bindings
0002
0003 Required properties:
0004 - compatible:
0005 - "altr,pio-1.0"
0006 - reg: Physical base address and length of the controller's registers.
0007 - #gpio-cells : Should be 2
0008 - The first cell is the gpio offset number.
0009 - The second cell is reserved and is currently unused.
0010 - gpio-controller : Marks the device node as a GPIO controller.
0011 - interrupt-controller: Mark the device node as an interrupt controller
0012 - #interrupt-cells : Should be 2. The interrupt type is fixed in the hardware.
0013 - The first cell is the GPIO offset number within the GPIO controller.
0014 - The second cell is the interrupt trigger type and level flags.
0015 - interrupts: Specify the interrupt.
0016 - altr,interrupt-type: Specifies the interrupt trigger type the GPIO
0017 hardware is synthesized. This field is required if the Altera GPIO controller
0018 used has IRQ enabled as the interrupt type is not software controlled,
0019 but hardware synthesized. Required if GPIO is used as an interrupt
0020 controller. The value is defined in <dt-bindings/interrupt-controller/irq.h>
0021 Only the following flags are supported:
0022 IRQ_TYPE_EDGE_RISING
0023 IRQ_TYPE_EDGE_FALLING
0024 IRQ_TYPE_EDGE_BOTH
0025 IRQ_TYPE_LEVEL_HIGH
0026
0027 Optional properties:
0028 - altr,ngpio: Width of the GPIO bank. This defines how many pins the
0029 GPIO device has. Ranges between 1-32. Optional and defaults to 32 if not
0030 specified.
0031
0032 Example:
0033
0034 gpio_altr: gpio@ff200000 {
0035 compatible = "altr,pio-1.0";
0036 reg = <0xff200000 0x10>;
0037 interrupts = <0 45 4>;
0038 altr,ngpio = <32>;
0039 altr,interrupt-type = <IRQ_TYPE_EDGE_RISING>;
0040 #gpio-cells = <2>;
0041 gpio-controller;
0042 #interrupt-cells = <2>;
0043 interrupt-controller;
0044 };
