linux-kernel - Re: [PATCH v1] i2c: lpi2c: implement master_xfer

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Message-ID: <20250411114738.GA43965@francesco-nb>
Date: Fri, 11 Apr 2025 13:47:38 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Dong Aisheng <aisheng.dong@....com>, Andi Shyti <andi.shyti@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>
Cc: Francesco Dolcini <francesco@...cini.it>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
	linux-i2c@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: Re: [PATCH v1] i2c: lpi2c: implement master_xfer_atomic callback

Hello,

On Wed, Mar 19, 2025 at 03:51:14PM +0100, Francesco Dolcini wrote:
> From: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
> 
> Rework the read and write code paths in the driver to support operation
> in atomic contexts. To achieve this, the driver must not rely on IRQs
> or perform any scheduling, e.g., via a sleep or schedule routine. Even
> jiffies do not advance in atomic contexts, so timeouts based on them
> are substituted with delays.
> 
> Implement atomic, sleep-free, and IRQ-less operation. This increases
> complexity but is necessary for atomic I2C transfers required by some
> hardware configurations, e.g., to trigger reboots on an external PMIC chip.
> 
> Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@...adex.com>
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>

Any comment on this?

Francesco