[PATCH v2] i2c: lpi2c: implement master_xfer_atomic callback

[Andi Shyti]

Hi Francesco,

On Fri, May 09, 2025 at 04:09:49PM +0200, Francesco Dolcini wrote:
> From: Emanuele Ghidoli <emanuele.ghidoli at toradex.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 at toradex.com>
> Signed-off-by: Francesco Dolcini <francesco.dolcini at toradex.com>
> Reviewed-by: Carlos Song <carlos.song at nxp.com>

merged to i2c/i2c-host.

Thanks and thanks Carlos for your review!

Andi