# Re: \[PATCH 19/26\] docs: i2c: smbus-protocol: improve I2C Block transactions description

- From: Jean Delvare \<hidden\>
- Date: 2020-01-21 09:16:47 
- List: linux-doc
- Page: https://ratatoskr.run/linux-doc/2020/01/5838211
- Thread: https://ratatoskr.run/linux-doc/2020/01/5821221/t.md

```text
On Sun,  5 Jan 2020 23:50:05 +0100, Luca Ceresoli wrote:
> 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>
> ---
>  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.

Reviewed-by: Jean Delvare <redacted>

-- 
Jean Delvare
SUSE L3 Support
```