| 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 |
