1 APM X-Gene SoC GPIO controller bindings 1 APM X-Gene SoC GPIO controller bindings
2 2
3 This is a gpio controller that is part of the 3 This is a gpio controller that is part of the flash controller.
4 This gpio controller controls a total of 48 gp 4 This gpio controller controls a total of 48 gpios.
5 5
6 Required properties: 6 Required properties:
7 - compatible: "apm,xgene-gpio" for X-Gene GPIO 7 - compatible: "apm,xgene-gpio" for X-Gene GPIO controller
8 - reg: Physical base address and size of the c 8 - reg: Physical base address and size of the controller's registers
9 - #gpio-cells: Should be two. 9 - #gpio-cells: Should be two.
10 - first cell is the pin number 10 - first cell is the pin number
11 - second cell is used to specify the g 11 - second cell is used to specify the gpio polarity:
12 0 = active high 12 0 = active high
13 1 = active low 13 1 = active low
14 - gpio-controller: Marks the device node as a 14 - gpio-controller: Marks the device node as a GPIO controller.
15 15
16 Example: 16 Example:
17 gpio0: gpio0@1701c000 { 17 gpio0: gpio0@1701c000 {
18 compatible = "apm,xgene-gpio"; 18 compatible = "apm,xgene-gpio";
19 reg = <0x0 0x1701c000 0x0 0x40 19 reg = <0x0 0x1701c000 0x0 0x40>;
20 gpio-controller; 20 gpio-controller;
21 #gpio-cells = <2>; 21 #gpio-cells = <2>;
22 }; 22 };
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