1 * Technologic Systems I2C-FPGA's GPIO controller bindings
2
3 This bindings describes the GPIO controller for Technologic's FPGA core.
4 TS-4900's FPGA encodes the GPIO state on 3 bits, whereas the TS-7970's FPGA
5 uses 2 bits: it doesn't use a dedicated input bit.
6
7 Required properties:
8 - compatible: Should be one of the following
9 "technologic,ts4900-gpio"
10 "technologic,ts7970-gpio"
11 - reg: Physical base address of the controller and length
12 of memory mapped region.
13 - #gpio-cells: Should be two. The first cell is the pin number.
14 - gpio-controller: Marks the device node as a gpio controller.
15
16 Optional property:
17 - ngpios: Number of GPIOs this controller is instantiated with,
18 the default is 32. See gpio.txt for more details.
19
20 Example:
21
22 &i2c2 {
23 gpio8: gpio@28 {
24 compatible = "technologic,ts4900-gpio";
25 reg = <0x28>;
26 #gpio-cells = <2>;
27 gpio-controller;
28 ngpios = <32>;
29 };
30 };
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