tree dea3c7a564d3ee9c181d1f867414965a7d29025c
parent a7284a82e826b88eb6264747cee57888d4076c48
author Bartosz Golaszewski <bgolaszewski@baylibre.com> 1465202931 +0200
committer Wolfram Sang <wsa@the-dreams.de> 1468778250 +0200

eeprom: at24: support reading the serial number for 24csxx

The chips from the at24cs family have two memory areas - a regular
read-write block and a read-only area containing the serial number.

The latter is visible on a different slave address (the address of the
rw memory block + 0x08). In order to access both blocks the user needs
to instantiate a regular at24c device for the rw block address and a
corresponding at24cs device on the serial number block address.

Add a function that allows to access the serial number and assign it
to at24->read_func if the chip allows serial number read operations
and the driver was passed the relevant flag for this device.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>