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Diffstat (limited to 'roms/u-boot/doc/device-tree-bindings/gpio/altera_pio.txt')
| -rw-r--r-- | roms/u-boot/doc/device-tree-bindings/gpio/altera_pio.txt | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/roms/u-boot/doc/device-tree-bindings/gpio/altera_pio.txt b/roms/u-boot/doc/device-tree-bindings/gpio/altera_pio.txt new file mode 100644 index 000000000..cf71eb282 --- /dev/null +++ b/roms/u-boot/doc/device-tree-bindings/gpio/altera_pio.txt @@ -0,0 +1,28 @@ +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 |