47 lines
1.3 KiB
Plaintext
47 lines
1.3 KiB
Plaintext
GPIO Driver for XRA1403 16-BIT GPIO Expander With Reset Input from EXAR
|
|
|
|
The XRA1403 is an 16-bit GPIO expander with an SPI interface. Features available:
|
|
- Individually programmable inputs:
|
|
- Internal pull-up resistors
|
|
- Polarity inversion
|
|
- Individual interrupt enable
|
|
- Rising edge and/or Falling edge interrupt
|
|
- Input filter
|
|
- Individually programmable outputs
|
|
- Output Level Control
|
|
- Output Three-State Control
|
|
|
|
Properties
|
|
----------
|
|
Check documentation for SPI and GPIO controllers regarding properties needed to configure the node.
|
|
|
|
- compatible = "exar,xra1403".
|
|
- reg - SPI id of the device.
|
|
- gpio-controller - marks the node as gpio.
|
|
- #gpio-cells - should be two where the first cell is the pin number
|
|
and the second one is used for optional parameters.
|
|
|
|
Optional properties:
|
|
-------------------
|
|
- reset-gpios: in case available used to control the device reset line.
|
|
- interrupt-controller - marks the node as interrupt controller.
|
|
- #interrupt-cells - should be two and represents the number of cells
|
|
needed to encode interrupt source.
|
|
|
|
Example
|
|
--------
|
|
|
|
gpioxra0: gpio@2 {
|
|
compatible = "exar,xra1403";
|
|
reg = <2>;
|
|
|
|
gpio-controller;
|
|
#gpio-cells = <2>;
|
|
|
|
interrupt-controller;
|
|
#interrupt-cells = <2>;
|
|
|
|
reset-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>;
|
|
spi-max-frequency = <1000000>;
|
|
};
|