Altera GPIO controller bindings
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Required properties:
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- compatible:
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- "altr,pio-1.0"
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- reg: Physical base address and length of the controller's registers.
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Optional properties:
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- altr,gpio-bank-width: Width of the GPIO bank. This defines how many pins the
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GPIO device has. Ranges between 1-32. Optional and defaults to 32 if not
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specified.
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- gpio-bank-name: bank name attached to this device.
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Example:
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user_led_pio_8out: gpio@0x4cc0 {
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compatible = "altr,pio-1.0";
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reg = <0x00004cc0 0x00000010>;
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resetvalue = <255>;
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altr,gpio-bank-width = <8>;
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#gpio-cells = <2>;
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gpio-controller;
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gpio-bank-name = "led";
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};
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In this example, the gpio can be accessed as led[0..7] using gpio command of
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u-boot.
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==> gpio clear led0
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