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docs: i2c: smbus-protocol: improve I2C Block transactions description 

Clarify from the beginning what these transactions are, and specifically
how they differ from the SMBus counterparts, i.e. the lack of a Count byte.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Luca Ceresoli 2020-01-29 16:19:44 +01:00 committed by Wolfram Sang
parent c7148b059c
commit 95b83774e3
1 changed files with 4 additions and 3 deletions
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Documentation/i2c/smbus-protocol.rst
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@ -282,9 +282,10 @@ This is implemented the following way in the Linux kernel:
I2C Block Transactions
======================
The following I2C block transactions are supported by the
SMBus layer and are described here for completeness.
They are *NOT* defined by the SMBus specification.
The following I2C block transactions are similar to the SMBus Block Read
and Write operations, except these do not have a Count byte. They are
supported by the SMBus layer and are described here for completeness, but
they are *NOT* defined by the SMBus specification.
I2C block transactions do not limit the number of bytes transferred
but the SMBus layer places a limit of 32 bytes.