1 Broadcom BCM2835 GPIO (and pinmux) controller
2
3 The BCM2835 GPIO module is a combined GPIO con
4 controller, and pinmux/control device.
5
6 Required properties:
7 - compatible: "brcm,bcm2835-gpio"
8 - compatible: should be one of:
9 "brcm,bcm2835-gpio" - BCM2835 compatible pin
10 "brcm,bcm7211-gpio" - BCM7211 compatible pin
11 "brcm,bcm2711-gpio" - BCM2711 compatible pin
12 "brcm,bcm7211-gpio" - BCM7211 compatible pin
13 - reg: Should contain the physical address of
14 - gpio-controller: Marks the device node as a
15 - #gpio-cells : Should be two. The first cell
16 second cell is used to specify optional para
17 - bit 0 specifies polarity (0 for normal, 1
18 - interrupts : The interrupt outputs from the
19 individual bank followed by the "all banks"
20 additional set of per-bank interrupt line an
21 interrupt may be specified.
22 - interrupt-controller: Marks the device node
23 - #interrupt-cells : Should be 2.
24 The first cell is the GPIO number.
25 The second cell is used to specify flags:
26 bits[3:0] trigger type and level flags:
27 1 = low-to-high edge triggered.
28 2 = high-to-low edge triggered.
29 4 = active high level-sensitive.
30 8 = active low level-sensitive.
31 Valid combinations are 1, 2, 3, 4, 8.
32
33 Please refer to ../gpio/gpio.txt for a general
34
35 Please refer to pinctrl-bindings.txt in this d
36 common pinctrl bindings used by client devices
37 phrase "pin configuration node".
38
39 Each pin configuration node lists the pin(s) t
40 more of the mux function to select on those pi
41 configuration. Each subnode only affects those
42 listed. In other words, a subnode that lists o
43 information about any pull configuration. Simi
44 a pul parameter implies no information about t
45
46 The BCM2835 pin configuration and multiplexing
47 For details on each properties, you can refer
48
49 Required sub-node properties:
50 - pins
51 - function
52
53 Optional sub-node properties:
54 - bias-disable
55 - bias-pull-up
56 - bias-pull-down
57 - output-high
58 - output-low
59
60 Legacy pin configuration and multiplexing bind
61 *** (Its use is deprecated, use generic multip
62 bindings instead)
63
64 Required subnode-properties:
65 - brcm,pins: An array of cells. Each cell cont
66 are the integer GPIO IDs; 0==GPIO0, 1==GPIO1
67
68 Optional subnode-properties:
69 - brcm,function: Integer, containing the funct
70 0: GPIO in
71 1: GPIO out
72 2: alt5
73 3: alt4
74 4: alt0
75 5: alt1
76 6: alt2
77 7: alt3
78 - brcm,pull: Integer, representing the pull-do
79 0: none
80 1: down
81 2: up
82
83 Each of brcm,function and brcm,pull may contai
84 will be applied to all pins in brcm,pins, or 1
85 brcm,pins.
86
87 Example:
88
89 gpio: gpio {
90 compatible = "brcm,bcm2835-gpi
91 reg = <0x2200000 0xb4>;
92 interrupts = <2 17>, <2 19>, <
93
94 gpio-controller;
95 #gpio-cells = <2>;
96
97 interrupt-controller;
98 #interrupt-cells = <2>;
99 };
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