60 lines
2.2 KiB
Plaintext
60 lines
2.2 KiB
Plaintext
|
* MAX732x-compatible I/O expanders
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- compatible: Should be one of the following:
|
||
|
|
- "maxim,max7319": For the Maxim MAX7319
|
||
|
|
- "maxim,max7320": For the Maxim MAX7320
|
||
|
|
- "maxim,max7321": For the Maxim MAX7321
|
||
|
|
- "maxim,max7322": For the Maxim MAX7322
|
||
|
|
- "maxim,max7323": For the Maxim MAX7323
|
||
|
|
- "maxim,max7324": For the Maxim MAX7324
|
||
|
|
- "maxim,max7325": For the Maxim MAX7325
|
||
|
|
- "maxim,max7326": For the Maxim MAX7326
|
||
|
|
- "maxim,max7327": For the Maxim MAX7327
|
||
|
|
- reg: I2C slave address for this device.
|
||
|
|
- gpio-controller: Marks the device node as a GPIO controller.
|
||
|
|
- #gpio-cells: Should be 2.
|
||
|
|
- first cell is the GPIO number
|
||
|
|
- second cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
|
||
|
|
Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
|
||
|
|
The I/O expander can detect input state changes, and thus optionally act as
|
||
|
|
an interrupt controller. When the expander interrupt line is connected all the
|
||
|
|
following properties must be set. For more information please see the
|
||
|
|
interrupt controller device tree bindings documentation available at
|
||
|
|
Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
|
||
|
|
|
||
|
|
- interrupt-controller: Identifies the node as an interrupt controller.
|
||
|
|
- #interrupt-cells: Number of cells to encode an interrupt source, shall be 2.
|
||
|
|
- first cell is the pin number
|
||
|
|
- second cell is used to specify flags
|
||
|
|
- interrupt-parent: phandle of the parent interrupt controller.
|
||
|
|
- interrupts: Interrupt specifier for the controllers interrupt.
|
||
|
|
|
||
|
|
Please refer to gpio.txt in this directory for details of the common GPIO
|
||
|
|
bindings used by client devices.
|
||
|
|
|
||
|
|
Example 1. MAX7325 with interrupt support enabled (CONFIG_GPIO_MAX732X_IRQ=y):
|
||
|
|
|
||
|
|
expander: max7325@6d {
|
||
|
|
compatible = "maxim,max7325";
|
||
|
|
reg = <0x6d>;
|
||
|
|
gpio-controller;
|
||
|
|
#gpio-cells = <2>;
|
||
|
|
interrupt-controller;
|
||
|
|
#interrupt-cells = <2>;
|
||
|
|
interrupt-parent = <&gpio4>;
|
||
|
|
interrupts = <29 IRQ_TYPE_EDGE_FALLING>;
|
||
|
|
};
|
||
|
|
|
||
|
|
Example 2. MAX7325 with interrupt support disabled (CONFIG_GPIO_MAX732X_IRQ=n):
|
||
|
|
|
||
|
|
expander: max7325@6d {
|
||
|
|
compatible = "maxim,max7325";
|
||
|
|
reg = <0x6d>;
|
||
|
|
gpio-controller;
|
||
|
|
#gpio-cells = <2>;
|
||
|
|
};
|