Device tree binding documentation for Technologic's I2C-FPGA GPIO controller.
Signed-off-by: Lucile Quirion <[email protected]> --- .../devicetree/bindings/gpio/gpio-ts4900.txt | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-ts4900.txt diff --git a/Documentation/devicetree/bindings/gpio/gpio-ts4900.txt b/Documentation/devicetree/bindings/gpio/gpio-ts4900.txt new file mode 100644 index 0000000..e114f6f --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-ts4900.txt @@ -0,0 +1,29 @@ +* Technologic Systems I2C-FPGA's GPIO controller bindings + +This bindings describes the GPIO controller for Technologic's FPGA core. +TS-4900's FPGA encodes the GPIO state on 3 bits, whereas the TS-7970's FPGA +uses 2 bits: it doesn't use a dedicated input bit. + +Required properties: +- compatible: Should be one of the following + "technologic,ts4900-gpio" + "technologic,ts7970-gpio" +- reg: Physical base address of the controller and length + of memory mapped region. +- #gpio-cells: Should be two. The first cell is the pin number. +- gpio-controller: Marks the device node as a gpio controller. + +Optional property: +- ngpios: see "gpio.txt". + +Example: + +&i2c2 { + gpio8: ts4900-gpio@28 { + compatible = "technologic,ts4900-gpio"; + reg = <0x28>; + #gpio-cells = <2>; + gpio-controller; + ngpios = <32>; + }; +}; -- 2.5.5
