Spreadtrum GPIO controller bindings The controller's registers are organized as sets of sixteen 16-bit registers with each set controlling a bank of up to 16 pins. A single interrupt is shared for all of the banks handled by the controller. Required properties: - compatible: Should be "sprd,sc9860-gpio". - reg: Define the base and range of the I/O address space containing the GPIO controller registers. - gpio-controller: Marks the device node as a GPIO controller. - #gpio-cells: Should be <2>. The first cell is the gpio number and the second cell is used to specify optional parameters. - interrupt-controller: Marks the device node as an interrupt controller. - #interrupt-cells: Should be <2>. Specifies the number of cells needed to encode interrupt source. - interrupts: Should be the port interrupt shared by all the gpios. Example: ap_gpio: gpio@40280000 { compatible = "sprd,sc9860-gpio"; reg = <0 0x40280000 0 0x1000>; gpio-controller; #gpio-cells = <2>; interrupt-controller; #interrupt-cells = <2>; interrupts = ; };