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i2c: support 10 bit and slave addresses in sysfs 'new_device'

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We now have seperate address spaces for 10 bit and we-are-slave clients.
Update the sysfs device instantiation method to support these types by
accepting the address offsets that are assigned to the extra address
spaces. Update the documentation, too.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang
2015-07-27 14:03:38 +02:00
committed by Wolfram Sang
parent 9bccc70a12
commit cfa0327b0d
3 changed files with 21 additions and 4 deletions
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9
Documentation/i2c/slave-interface
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@@ -31,10 +31,13 @@ User manual
===========
I2C slave backends behave like standard I2C clients. So, you can instantiate
them as described in the document 'instantiating-devices'. A quick example for
instantiating the slave-eeprom driver from userspace at address 0x64 on bus 1:
them as described in the document 'instantiating-devices'. The only difference
is that i2c slave backends have their own address space. So, you have to add
0x1000 to the address you would originally request. An example for
instantiating the slave-eeprom driver from userspace at the 7 bit address 0x64
on bus 1:
# echo slave-24c02 0x64 > /sys/bus/i2c/devices/i2c-1/new_device
# echo slave-24c02 0x1064 > /sys/bus/i2c/devices/i2c-1/new_device
Each backend should come with separate documentation to describe its specific
behaviour and setup.