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