1Altera GPIO controller bindings 2 3Required properties: 4- compatible: 5 - "altr,pio-1.0" 6- reg: Physical base address and length of the controller's registers. 7- #gpio-cells : Should be 2 8 - The first cell is the gpio offset number. 9 - The second cell is reserved and is currently unused. 10- gpio-controller : Marks the device node as a GPIO controller. 11- interrupt-controller: Mark the device node as an interrupt controller 12- #interrupt-cells : Should be 2. The interrupt type is fixed in the hardware. 13 - The first cell is the GPIO offset number within the GPIO controller. 14 - The second cell is the interrupt trigger type and level flags. 15- interrupts: Specify the interrupt. 16- altr,interrupt-type: Specifies the interrupt trigger type the GPIO 17 hardware is synthesized. This field is required if the Altera GPIO controller 18 used has IRQ enabled as the interrupt type is not software controlled, 19 but hardware synthesized. Required if GPIO is used as an interrupt 20 controller. The value is defined in <dt-bindings/interrupt-controller/irq.h> 21 Only the following flags are supported: 22 IRQ_TYPE_EDGE_RISING 23 IRQ_TYPE_EDGE_FALLING 24 IRQ_TYPE_EDGE_BOTH 25 IRQ_TYPE_LEVEL_HIGH 26 27Optional properties: 28- altr,ngpio: Width of the GPIO bank. This defines how many pins the 29 GPIO device has. Ranges between 1-32. Optional and defaults to 32 if not 30 specified. 31 32Example: 33 34gpio_altr: gpio@ff200000 { 35 compatible = "altr,pio-1.0"; 36 reg = <0xff200000 0x10>; 37 interrupts = <0 45 4>; 38 altr,ngpio = <32>; 39 altr,interrupt-type = <IRQ_TYPE_EDGE_RISING>; 40 #gpio-cells = <2>; 41 gpio-controller; 42 #interrupt-cells = <2>; 43 interrupt-controller; 44}; 45