ARM PL061 GPIO controller
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Required properties:
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- compatible : "arm,pl061", "arm,primecell"
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- #gpio-cells : Should be two. The first cell is the pin number and the
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second cell is used to specify optional parameters:
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- bit 0 specifies polarity (0 for normal, 1 for inverted)
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- gpio-controller : Marks the device node as a GPIO controller.
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- interrupts : Interrupt mapping for GPIO IRQ.
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- gpio-ranges : Interaction with the PINCTRL subsystem.
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