1 NXP LPC18xx/43xx GPIO controller Device Tree Bindings
2 -----------------------------------------------------
3
4 Required properties:
5 - compatible : Should be "nxp,lpc1850-gpio"
6 - reg : List of addresses and lengths of the GPIO controller
7 register sets
8 - reg-names : Should be "gpio", "gpio-pin-ic", "gpio-group0-ic" and
9 "gpio-gpoup1-ic"
10 - clocks : Phandle and clock specifier pair for GPIO controller
11 - resets : Phandle and reset specifier pair for GPIO controller
12 - gpio-controller : Marks the device node as a GPIO controller
13 - #gpio-cells : Should be two:
14 - The first cell is the GPIO line number
15 - The second cell is used to specify polarity
16 - interrupt-controller : Marks the device node as an interrupt controller
17 - #interrupt-cells : Should be two:
18 - The first cell is an interrupt number within
19 0..9 range, for GPIO pin interrupts it is equal
20 to 'nxp,gpio-pin-interrupt' property value of
21 GPIO pin configuration, 8 is for GPIO GROUP0
22 interrupt, 9 is for GPIO GROUP1 interrupt
23 - The second cell is used to specify interrupt type
24
25 Optional properties:
26 - gpio-ranges : Mapping between GPIO and pinctrl
27
28 Example:
29 #define LPC_GPIO(port, pin) (port * 32 + pin)
30 #define LPC_PIN(port, pin) (0x##port * 32 + pin)
31
32 gpio: gpio@400f4000 {
33 compatible = "nxp,lpc1850-gpio";
34 reg = <0x400f4000 0x4000>, <0x40087000 0x1000>,
35 <0x40088000 0x1000>, <0x40089000 0x1000>;
36 reg-names = "gpio", "gpio-pin-ic",
37 "gpio-group0-ic", "gpio-gpoup1-ic";
38 clocks = <&ccu1 CLK_CPU_GPIO>;
39 resets = <&rgu 28>;
40 gpio-controller;
41 #gpio-cells = <2>;
42 interrupt-controller;
43 #interrupt-cells = <2>;
44 gpio-ranges = <&pinctrl LPC_GPIO(0,0) LPC_PIN(0,0) 2>,
45 ...
46 <&pinctrl LPC_GPIO(7,19) LPC_PIN(f,5) 7>;
47 };
48
49 gpio_joystick {
50 compatible = "gpio-keys";
51 ...
52
53 button0 {
54 ...
55 interrupt-parent = <&gpio>;
56 interrupts = <1 IRQ_TYPE_EDGE_BOTH>;
57 gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>;
58 };
59 };
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