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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-22 10:42:54 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-22 10:42:54 -0700 |
commit | 4e93d3e8859c834ee18dfd33051d24df8669d0c0 (patch) | |
tree | 13f5b39730857257b5040471618e9bcce30ed9cc /Documentation/i2c/chips/max6875 | |
parent | a0cd30fd26a398c0c6e50c6760610d4529f17a84 (diff) | |
parent | 0087e5ef577d0d6e664be7ab4be513b6a482e7ec (diff) |
Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/i2c-2.6
Diffstat (limited to 'Documentation/i2c/chips/max6875')
-rw-r--r-- | Documentation/i2c/chips/max6875 | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/Documentation/i2c/chips/max6875 b/Documentation/i2c/chips/max6875 new file mode 100644 index 00000000000..b4fb49b4181 --- /dev/null +++ b/Documentation/i2c/chips/max6875 @@ -0,0 +1,54 @@ +Kernel driver max6875 +===================== + +Supported chips: + * Maxim max6874, max6875 + Prefixes: 'max6875' + Addresses scanned: 0x50, 0x52 + Datasheets: + http://pdfserv.maxim-ic.com/en/ds/MAX6874-MAX6875.pdf + +Author: Ben Gardner <bgardner@wabtec.com> + + +Module Parameters +----------------- + +* allow_write int + Set to non-zero to enable write permission: + *0: Read only + 1: Read and write + + +Description +----------- + +The MAXIM max6875 is a 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 configuration +registers. The chip then begins to operate according to the values in the +registers. + +See the datasheet for details on how to program the EEPROM. + + +Sysfs entries +------------- + +eeprom_user - 512 bytes of user-defined EEPROM space. Only writable if + allow_write was set and register 0x43 is 0. + +eeprom_config - 70 bytes of config EEPROM. Note that changes will not get + loaded into register space until a power cycle or device reset. + +reg_config - 70 bytes of register space. Any changes take affect immediately. + + +General Remarks +--------------- + +A typical application will require that the EEPROMs be programmed once and +never altered afterwards. + |