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Date:   Fri, 31 Aug 2018 11:53:56 +0200
From:   Wolfram Sang <>
To:     Masahiro Yamada <>
        Wolfram Sang <>,
        Linux Kernel Mailing List <>
Subject: Re: [Question] When should a driver issue STOP condition?

> The problem is, my driver is forcibly setting
> STOP condition unless the next message is read.

This likely is a problem.

In Linux I2C terminology, a transfer is everything between a START and a
STOP. A transfer may consist of multiple messages, connected with

So, a STOP should be generated after the last message of a transfer or
of I2C_M_STOP is set in a message. The latter should be super-rare
because mostly you should be able to use multiple transfers with a
regular STOP instead.

[1] Slide 8 illustrates this:

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