1Spreadtrum GPIO controller bindings 2 3The controller's registers are organized as sets of sixteen 16-bit 4registers with each set controlling a bank of up to 16 pins. A single 5interrupt is shared for all of the banks handled by the controller. 6 7Required properties: 8- compatible: Should be "sprd,sc9860-gpio". 9- reg: Define the base and range of the I/O address space containing 10the GPIO controller registers. 11- gpio-controller: Marks the device node as a GPIO controller. 12- #gpio-cells: Should be <2>. The first cell is the gpio number and 13the second cell is used to specify optional parameters. 14- interrupt-controller: Marks the device node as an interrupt controller. 15- #interrupt-cells: Should be <2>. Specifies the number of cells needed 16to encode interrupt source. 17- interrupts: Should be the port interrupt shared by all the gpios. 18 19Example: 20 ap_gpio: gpio@40280000 { 21 compatible = "sprd,sc9860-gpio"; 22 reg = <0 0x40280000 0 0x1000>; 23 gpio-controller; 24 #gpio-cells = <2>; 25 interrupt-controller; 26 #interrupt-cells = <2>; 27 interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>; 28 }; 29