linux-kernel - Re: [PATCH v2 1/5] spi: add spi_optimize

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Date: Sat, 24 Feb 2024 16:36:22 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Mark Brown <broonie@...nel.org>, Martin Sperl <kernel@...tin.sperl.org>,
 David Jander <david@...tonic.nl>, Michael Hennerich
 <michael.hennerich@...log.com>, Nuno Sá <nuno.sa@...log.com>,
 Alain Volmat <alain.volmat@...s.st.com>, Maxime Coquelin
 <mcoquelin.stm32@...il.com>, Alexandre Torgue
 <alexandre.torgue@...s.st.com>, linux-spi@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 1/5] spi: add spi_optimize_message() APIs

On Mon, 19 Feb 2024 16:33:18 -0600
David Lechner <dlechner@...libre.com> wrote:

> This adds a new spi_optimize_message() function that can be used to
> optimize SPI messages that are used more than once. Peripheral drivers
> that use the same message multiple times can use this API to perform SPI
> message validation and controller-specific optimizations once and then
> reuse the message while avoiding the overhead of revalidating the
> message on each spi_(a)sync() call.
> 
> Internally, the SPI core will also call this function for each message
> if the peripheral driver did not explicitly call it. This is done to so
> that controller drivers don't have to have multiple code paths for
> optimized and non-optimized messages.
> 
> A hook is provided for controller drivers to perform controller-specific
> optimizations.
> 
> Suggested-by: Martin Sperl <kernel@...tin.sperl.org>
> Link: https://lore.kernel.org/linux-spi/39DEC004-10A1-47EF-9D77-276188D2580C@martin.sperl.org/
> Signed-off-by: David Lechner <dlechner@...libre.com>

Very nice.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>