1Broadcom iProc GPIO/PINCONF Controller 2 3Required properties: 4 5- compatible: 6 Must be "brcm,cygnus-ccm-gpio", "brcm,cygnus-asiu-gpio", 7 "brcm,cygnus-crmu-gpio" or "brcm,iproc-gpio" 8 9- reg: 10 Define the base and range of the I/O address space that contains SoC 11GPIO/PINCONF controller registers 12 13- ngpios: 14 Total number of in-use slots in GPIO controller 15 16- #gpio-cells: 17 Must be two. The first cell is the GPIO pin number (within the 18controller's pin space) and the second cell is used for the following: 19 bit[0]: polarity (0 for active high and 1 for active low) 20 21- gpio-controller: 22 Specifies that the node is a GPIO controller 23 24Optional properties: 25 26- interrupts: 27 Interrupt ID 28 29- interrupt-controller: 30 Specifies that the node is an interrupt controller 31 32- gpio-ranges: 33 Specifies the mapping between gpio controller and pin-controllers pins. 34 This requires 4 fields in cells defined as - 35 1. Phandle of pin-controller. 36 2. GPIO base pin offset. 37 3 Pin-control base pin offset. 38 4. number of gpio pins which are linearly mapped from pin base. 39 40Supported generic PINCONF properties in child nodes: 41 42- pins: 43 The list of pins (within the controller's own pin space) that properties 44in the node apply to. Pin names are "gpio-<pin>" 45 46- bias-disable: 47 Disable pin bias 48 49- bias-pull-up: 50 Enable internal pull up resistor 51 52- bias-pull-down: 53 Enable internal pull down resistor 54 55- drive-strength: 56 Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA) 57 58Example: 59 gpio_ccm: gpio@1800a000 { 60 compatible = "brcm,cygnus-ccm-gpio"; 61 reg = <0x1800a000 0x50>, 62 <0x0301d164 0x20>; 63 ngpios = <24>; 64 #gpio-cells = <2>; 65 gpio-controller; 66 interrupts = <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>; 67 interrupt-controller; 68 69 touch_pins: touch_pins { 70 pwr: pwr { 71 pins = "gpio-0"; 72 drive-strength = <16>; 73 }; 74 75 event: event { 76 pins = "gpio-1"; 77 bias-pull-up; 78 }; 79 }; 80 }; 81 82 gpio_asiu: gpio@180a5000 { 83 compatible = "brcm,cygnus-asiu-gpio"; 84 reg = <0x180a5000 0x668>; 85 ngpios = <146>; 86 #gpio-cells = <2>; 87 gpio-controller; 88 interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>; 89 interrupt-controller; 90 gpio-ranges = <&pinctrl 0 42 1>, 91 <&pinctrl 1 44 3>; 92 }; 93 94 /* 95 * Touchscreen that uses the CCM GPIO 0 and 1 96 */ 97 tsc { 98 ... 99 ... 100 gpio-pwr = <&gpio_ccm 0 0>; 101 gpio-event = <&gpio_ccm 1 0>; 102 }; 103 104 /* Bluetooth that uses the ASIU GPIO 5, with polarity inverted */ 105 bluetooth { 106 ... 107 ... 108 bcm,rfkill-bank-sel = <&gpio_asiu 5 1> 109 } 110