linux-kernel - Re: [PATCH 0/3] i2c: designware: Improve support of multi-messages transfer

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Message-ID: <aPPvSCNnkzfH-2X7@ashevche-desk.local>
Date: Sat, 18 Oct 2025 22:49:28 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Benoît Monin <benoit.monin@...tlin.com>,
	Hans Verkuil <hverkuil@...nel.org>
Cc: Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Jan Dabros <jsd@...ihalf.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Gregory CLEMENT <gregory.clement@...tlin.com>,
	Théo Lebrun <theo.lebrun@...tlin.com>,
	Tawfik Bayouk <tawfik.bayouk@...ileye.com>,
	Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
	Dmitry Guzman <dmitry.guzman@...ileye.com>,
	linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev
Subject: Re: [PATCH 0/3] i2c: designware: Improve support of multi-messages
 transfer

+Cc: Hans. Hans, isn't it what you wanted to have for your use-case?

On Fri, Oct 17, 2025 at 04:59:31PM +0200, Benoît Monin wrote:
> Extend what can be done when transferring multiple messages in a single
> call to .xfer().
> 
> Allow changing the target address by waiting for a STOP then looping
> in i2c_dw_xfer() instead of erroring out when a change of address is
> detected. The loop then re-run i2c_dw_xfer_init() which changes the
> target address and restart the transfer for the rest of the messages.
> 
> Handle controllers that lack the ability to emit a RESTART when two
> consecutive messages have the same address and direction, by waiting
> for a STOP and restarting the rest of the transfer.
> 
> The i2c controllers found in the EyeQ6Lplus and EyeQ7H SoC from
> Mobileye lack such capability, so compatible strings are added because
> this cannot be detected at runtime.

-- 
With Best Regards,
Andy Shevchenko