xref: /rk3399_rockchip-uboot/doc/device-tree-bindings/gpio/altera_pio.txt (revision e573bdb324c78fac56655a493bea843842c9d9f8) 
1*88d5ecf4SThomas ChouAltera GPIO controller bindings
2*88d5ecf4SThomas Chou
3*88d5ecf4SThomas ChouRequired properties:
4*88d5ecf4SThomas Chou- compatible:
5*88d5ecf4SThomas Chou  - "altr,pio-1.0"
6*88d5ecf4SThomas Chou- reg: Physical base address and length of the controller's registers.
7*88d5ecf4SThomas Chou
8*88d5ecf4SThomas ChouOptional properties:
9*88d5ecf4SThomas Chou- altr,gpio-bank-width: Width of the GPIO bank. This defines how many pins the
10*88d5ecf4SThomas Chou  GPIO device has. Ranges between 1-32. Optional and defaults to 32 if not
11*88d5ecf4SThomas Chou  specified.
12*88d5ecf4SThomas Chou- gpio-bank-name: bank name attached to this device.
13*88d5ecf4SThomas Chou
14*88d5ecf4SThomas ChouExample:
15*88d5ecf4SThomas Chou
16*88d5ecf4SThomas Chouuser_led_pio_8out: gpio@0x4cc0 {
17*88d5ecf4SThomas Chou	compatible = "altr,pio-1.0";
18*88d5ecf4SThomas Chou	reg = <0x00004cc0 0x00000010>;
19*88d5ecf4SThomas Chou	resetvalue = <255>;
20*88d5ecf4SThomas Chou	altr,gpio-bank-width = <8>;
21*88d5ecf4SThomas Chou	#gpio-cells = <2>;
22*88d5ecf4SThomas Chou	gpio-controller;
23*88d5ecf4SThomas Chou	gpio-bank-name = "led";
24*88d5ecf4SThomas Chou};
25*88d5ecf4SThomas Chou
26*88d5ecf4SThomas ChouIn this example, the gpio can be accessed as led[0..7] using gpio command of
27*88d5ecf4SThomas Chouu-boot.
28*88d5ecf4SThomas Chou==> gpio clear led0
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