eeprom: at24: support eeproms that do not auto-rollover reads

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Some multi-address eeproms in the at24 family may not automatically
roll-over reads to the next slave address. On those eeproms, reads
that straddle slave boundaries will not work correctly.

Solution:
Mark such eeproms with a flag that prevents reads straddling
slave boundaries. Add the AT24_FLAG_NO_RDROL flag to the eeprom
entry in the device_id table, or add 'no-read-rollover' to the
eeprom devicetree entry.

Note that I have not personally enountered an at24 chip that
does not support read rollovers. They may or may not exist.
However, my hardware requires this functionality because of
a quirk.

Signed-off-by: Sven Van Asbroeck <svendev@arcx.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

...

This commit is contained in:

Sven Van Asbroeck 2017-12-08 11:28:30 -05:00 • committed by Bartosz Golaszewski

parent 355dd4ca10

commit e32213fbc5

2 changed files with 29 additions and 12 deletions

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39

drivers/misc/eeprom/at24.c

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2

include/linux/platform_data/at24.h

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