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committed 96d8d5ffae5Kernel driver max6875=====================Supported chips: * Maxim MAX6874, MAX6875 Prefix: 'max6875' Addresses scanned: None (see below) Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6874-MAX6875.pdfAuthor: Ben Gardner <bgardner@wabtec.com>Description-----------The Maxim MAX6875 is an EEPROM-programmable power-supply sequencer/supervisor.It provides timed outputs that can be used as a watchdog, if properly wired.It also provides 512 bytes of user EEPROM.At reset, the MAX6875 reads the configuration EEPROM into its configurationregisters. The chip then begins to operate according to the values in theregisters.The Maxim MAX6874 is a similar, mostly compatible device, with more inputsand outputs: vin gpi voutMAX6874 6 4 8MAX6875 4 3 5See the datasheet for more information.Sysfs entries-------------eeprom - 512 bytes of user-defined EEPROM space.General Remarks---------------Valid addresses for the MAX6875 are 0x50 and 0x52.Valid addresses for the MAX6874 are 0x50, 0x52, 0x54 and 0x56.The driver does not probe any address, so you explicitly instantiate thedevices.Example:$ modprobe max6875$ echo max6875 0x50 > /sys/bus/i2c/devices/i2c-0/new_deviceThe MAX6874/MAX6875 ignores address bit 0, so this driver attaches to multipleaddresses. For example, for address 0x50, it also reserves 0x51.The even-address instance is called 'max6875', the odd one is 'dummy'.Programming the chip using i2c-dev----------------------------------Use the i2c-dev interface to access and program the chips.Reads and writes are performed differently depending on the address range.The configuration registers are at addresses 0x00 - 0x45.