Re: [PATCH] i2c-tools: i2ctransfer: Set I2C adapter timeout using I2C_TIMEOUT ioctl

Wolfram Sang <[email protected]> Wed, 22 Jul 2026 09:56:24 +0200

Newsgroups	org.kernel.vger.linux-i2c
Message-ID	<amB3qFSwbeDZ5l7Q@shikoro>

> Why userspace need to decide and set the timeout values for adapter ?
> Adapter knows the transfer frequency and transfer data length, it can be
> calculated by core layer itself and can set.

Freq and data length are not enough for timeout calculation. It is also
board specific (e.g. capacitance) and environment specific (surrounding
noise). It can be argued to modify it from userspace. Unclear how much
that is used in practice, though.

> Retrials can be fixed and hard coded for everyone.

I don't think we can remove the interface because of the "don't break
userspace" rule.

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