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