mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 05:04:26 +00:00
29 lines
728 B
Text
29 lines
728 B
Text
|
Altera GPIO controller bindings
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- compatible:
|
||
|
|
- "altr,pio-1.0"
|
||
|
|
- reg: Physical base address and length of the controller's registers.
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
- altr,gpio-bank-width: 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.
|
||
|
|
- gpio-bank-name: bank name attached to this device.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
user_led_pio_8out: gpio@0x4cc0 {
|
||
|
|
compatible = "altr,pio-1.0";
|
||
|
|
reg = <0x00004cc0 0x00000010>;
|
||
|
|
resetvalue = <255>;
|
||
|
|
altr,gpio-bank-width = <8>;
|
||
|
|
#gpio-cells = <2>;
|
||
|
|
gpio-controller;
|
||
|
|
gpio-bank-name = "led";
|
||
|
|
};
|
||
|
|
|
||
|
|
In this example, the gpio can be accessed as led[0..7] using gpio command of
|
||
|
|
u-boot.
|
||
|
|
==> gpio clear led0
|