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      1 Altera GPIO controller bindings
      2 
      3 Required properties:
      4 - compatible:
      5   - "altr,pio-1.0"
      6 - reg: Physical base address and length of the controller's registers.
      7 
      8 Optional properties:
      9 - altr,gpio-bank-width: Width of the GPIO bank. This defines how many pins the
     10   GPIO device has. Ranges between 1-32. Optional and defaults to 32 if not
     11   specified.
     12 - gpio-bank-name: bank name attached to this device.
     13 
     14 Example:
     15 
     16 user_led_pio_8out: gpio@0x4cc0 {
     17 	compatible = "altr,pio-1.0";
     18 	reg = <0x00004cc0 0x00000010>;
     19 	resetvalue = <255>;
     20 	altr,gpio-bank-width = <8>;
     21 	#gpio-cells = <2>;
     22 	gpio-controller;
     23 	gpio-bank-name = "led";
     24 };
     25 
     26 In this example, the gpio can be accessed as led[0..7] using gpio command of
     27 u-boot.
     28 ==> gpio clear led0
     29