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Date:   Sun,  5 Jan 2020 23:50:05 +0100
From:   Luca Ceresoli <>
Cc:     Luca Ceresoli <>,
        Wolfram Sang <>,
        Peter Rosin <>,
Subject: [PATCH 19/26] 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 <>
 Documentation/i2c/smbus-protocol.rst | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/i2c/smbus-protocol.rst b/Documentation/i2c/smbus-protocol.rst
index 7350e4b2c2fa..0edaf6069ac1 100644
--- a/Documentation/i2c/smbus-protocol.rst
+++ b/Documentation/i2c/smbus-protocol.rst
@@ -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.

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