1GPIO driver for Maxim MAX3191x industrial serializer 2 3Required properties: 4 - compatible: Must be one of: 5 "maxim,max31910" 6 "maxim,max31911" 7 "maxim,max31912" 8 "maxim,max31913" 9 "maxim,max31953" 10 "maxim,max31963" 11 - reg: Chip select number. 12 - gpio-controller: Marks the device node as a GPIO controller. 13 - #gpio-cells: Should be two. For consumer use see gpio.txt. 14 15Optional properties: 16 - #daisy-chained-devices: 17 Number of chips in the daisy-chain (default is 1). 18 - maxim,modesel-gpios: GPIO pins to configure modesel of each chip. 19 The number of GPIOs must equal "#daisy-chained-devices" 20 (if each chip is driven by a separate pin) or 1 21 (if all chips are wired to the same pin). 22 - maxim,fault-gpios: GPIO pins to read fault of each chip. 23 The number of GPIOs must equal "#daisy-chained-devices" 24 or 1. 25 - maxim,db0-gpios: GPIO pins to configure debounce of each chip. 26 The number of GPIOs must equal "#daisy-chained-devices" 27 or 1. 28 - maxim,db1-gpios: GPIO pins to configure debounce of each chip. 29 The number of GPIOs must equal "maxim,db0-gpios". 30 - maxim,modesel-8bit: Boolean whether the modesel pin of the chips is 31 pulled high (8-bit mode). Use this if the modesel pin 32 is hardwired and consequently "maxim,modesel-gpios" 33 cannot be specified. By default if neither this nor 34 "maxim,modesel-gpios" is given, the driver assumes 35 that modesel is pulled low (16-bit mode). 36 - maxim,ignore-undervoltage: 37 Boolean whether to ignore undervoltage alarms signaled 38 by the "maxim,fault-gpios" or by the status byte 39 (in 16-bit mode). Use this if the chips are powered 40 through 5VOUT instead of VCC24V, in which case they 41 will constantly signal undervoltage. 42 43For other required and optional properties of SPI slave nodes please refer to 44../spi/spi-bus.txt. 45 46Example: 47 gpio@0 { 48 compatible = "maxim,max31913"; 49 reg = <0>; 50 gpio-controller; 51 #gpio-cells = <2>; 52 53 maxim,modesel-gpios = <&gpio2 23>; 54 maxim,fault-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>; 55 maxim,db0-gpios = <&gpio2 25>; 56 maxim,db1-gpios = <&gpio2 26>; 57 58 spi-max-frequency = <25000000>; 59 }; 60