1* MAX732x-compatible I/O expanders 2 3Required properties: 4 - compatible: Should be one of the following: 5 - "maxim,max7319": For the Maxim MAX7319 6 - "maxim,max7320": For the Maxim MAX7320 7 - "maxim,max7321": For the Maxim MAX7321 8 - "maxim,max7322": For the Maxim MAX7322 9 - "maxim,max7323": For the Maxim MAX7323 10 - "maxim,max7324": For the Maxim MAX7324 11 - "maxim,max7325": For the Maxim MAX7325 12 - "maxim,max7326": For the Maxim MAX7326 13 - "maxim,max7327": For the Maxim MAX7327 14 - reg: I2C slave address for this device. 15 - gpio-controller: Marks the device node as a GPIO controller. 16 - #gpio-cells: Should be 2. 17 - first cell is the GPIO number 18 - second cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>. 19 Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported. 20 21Optional properties: 22 23 The I/O expander can detect input state changes, and thus optionally act as 24 an interrupt controller. When the expander interrupt line is connected all the 25 following properties must be set. For more information please see the 26 interrupt controller device tree bindings documentation available at 27 Documentation/devicetree/bindings/interrupt-controller/interrupts.txt. 28 29 - interrupt-controller: Identifies the node as an interrupt controller. 30 - #interrupt-cells: Number of cells to encode an interrupt source, shall be 2. 31 - first cell is the pin number 32 - second cell is used to specify flags 33 - interrupts: Interrupt specifier for the controllers interrupt. 34 35Please refer to gpio.txt in this directory for details of the common GPIO 36bindings used by client devices. 37 38Example 1. MAX7325 with interrupt support enabled (CONFIG_GPIO_MAX732X_IRQ=y): 39 40 expander: max7325@6d { 41 compatible = "maxim,max7325"; 42 reg = <0x6d>; 43 gpio-controller; 44 #gpio-cells = <2>; 45 interrupt-controller; 46 #interrupt-cells = <2>; 47 interrupt-parent = <&gpio4>; 48 interrupts = <29 IRQ_TYPE_EDGE_FALLING>; 49 }; 50 51Example 2. MAX7325 with interrupt support disabled (CONFIG_GPIO_MAX732X_IRQ=n): 52 53 expander: max7325@6d { 54 compatible = "maxim,max7325"; 55 reg = <0x6d>; 56 gpio-controller; 57 #gpio-cells = <2>; 58 }; 59