blob: 174cdf3091700406bd26cb6d324dc2ec04fb10e0 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
ImgTec TZ1090 GPIO Controller
Required properties:
- compatible: Compatible property value should be "img,tz1090-gpio".
- reg: Physical base address of the controller and length of memory mapped
region.
- #address-cells: Should be 1 (for bank subnodes)
- #size-cells: Should be 0 (for bank subnodes)
- Each bank of GPIOs should have a subnode to represent it.
Bank subnode required properties:
- reg: Index of bank in the range 0 to 2.
- gpio-controller: Specifies that the node is a gpio controller.
- #gpio-cells: Should be 2. The syntax of the gpio specifier used by client
nodes should have the following values.
<[phandle of the gpio controller node]
[gpio number within the gpio bank]
[gpio flags]>
Values for gpio specifier:
- GPIO number: a value in the range 0 to 29.
- GPIO flags: bit field of flags, as defined in <dt-bindings/gpio/gpio.h>.
Only the following flags are supported:
GPIO_ACTIVE_HIGH
GPIO_ACTIVE_LOW
Bank subnode optional properties:
- gpio-ranges: Mapping to pin controller pins (as described in
Documentation/devicetree/bindings/gpio/gpio.txt)
- interrupts: Interrupt for the entire bank
- interrupt-controller: Specifies that the node is an interrupt controller
- #interrupt-cells: Should be 2. The syntax of the interrupt specifier used by
client nodes should have the following values.
<[phandle of the interurupt controller]
[gpio number within the gpio bank]
[irq flags]>
Values for irq specifier:
- GPIO number: a value in the range 0 to 29
- IRQ flags: value to describe edge and level triggering, as defined in
<dt-bindings/interrupt-controller/irq.h>. Only the following flags are
supported:
IRQ_TYPE_EDGE_RISING
IRQ_TYPE_EDGE_FALLING
IRQ_TYPE_EDGE_BOTH
IRQ_TYPE_LEVEL_HIGH
IRQ_TYPE_LEVEL_LOW
Example:
gpios: gpio-controller@02005800 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "img,tz1090-gpio";
reg = <0x02005800 0x90>;
/* bank 0 with an interrupt */
gpios0: bank@0 {
#gpio-cells = <2>;
#interrupt-cells = <2>;
reg = <0>;
interrupts = <13 IRQ_TYPE_LEVEL_HIGH>;
gpio-controller;
gpio-ranges = <&pinctrl 0 0 30>;
interrupt-controller;
};
/* bank 2 without interrupt */
gpios2: bank@2 {
#gpio-cells = <2>;
reg = <2>;
gpio-controller;
gpio-ranges = <&pinctrl 0 60 30>;
};
};
|
