0001 GPIO driver for Maxim MAX3191x industrial serializer
0002
0003 Required properties:
0004 - compatible: Must be one of:
0005 "maxim,max31910"
0006 "maxim,max31911"
0007 "maxim,max31912"
0008 "maxim,max31913"
0009 "maxim,max31953"
0010 "maxim,max31963"
0011 - reg: Chip select number.
0012 - gpio-controller: Marks the device node as a GPIO controller.
0013 - #gpio-cells: Should be two. For consumer use see gpio.txt.
0014
0015 Optional properties:
0016 - #daisy-chained-devices:
0017 Number of chips in the daisy-chain (default is 1).
0018 - maxim,modesel-gpios: GPIO pins to configure modesel of each chip.
0019 The number of GPIOs must equal "#daisy-chained-devices"
0020 (if each chip is driven by a separate pin) or 1
0021 (if all chips are wired to the same pin).
0022 - maxim,fault-gpios: GPIO pins to read fault of each chip.
0023 The number of GPIOs must equal "#daisy-chained-devices"
0024 or 1.
0025 - maxim,db0-gpios: GPIO pins to configure debounce of each chip.
0026 The number of GPIOs must equal "#daisy-chained-devices"
0027 or 1.
0028 - maxim,db1-gpios: GPIO pins to configure debounce of each chip.
0029 The number of GPIOs must equal "maxim,db0-gpios".
0030 - maxim,modesel-8bit: Boolean whether the modesel pin of the chips is
0031 pulled high (8-bit mode). Use this if the modesel pin
0032 is hardwired and consequently "maxim,modesel-gpios"
0033 cannot be specified. By default if neither this nor
0034 "maxim,modesel-gpios" is given, the driver assumes
0035 that modesel is pulled low (16-bit mode).
0036 - maxim,ignore-undervoltage:
0037 Boolean whether to ignore undervoltage alarms signaled
0038 by the "maxim,fault-gpios" or by the status byte
0039 (in 16-bit mode). Use this if the chips are powered
0040 through 5VOUT instead of VCC24V, in which case they
0041 will constantly signal undervoltage.
0042
0043 For other required and optional properties of SPI slave nodes please refer to
0044 ../spi/spi-bus.txt.
0045
0046 Example:
0047 gpio@0 {
0048 compatible = "maxim,max31913";
0049 reg = <0>;
0050 gpio-controller;
0051 #gpio-cells = <2>;
0052
0053 maxim,modesel-gpios = <&gpio2 23>;
0054 maxim,fault-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>;
0055 maxim,db0-gpios = <&gpio2 25>;
0056 maxim,db1-gpios = <&gpio2 26>;
0057
0058 spi-max-frequency = <25000000>;
0059 };
