linux-kernel - Re: [PATCH 05/13] spi: axi-spi-engine: add SPI offload support

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Message-ID: <a94d7aae-3d5c-4204-83f6-5374c3166f58@sirena.org.uk>
Date: Wed, 10 Jan 2024 21:39:23 +0000
From: Mark Brown <broonie@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Frank Rowand <frowand.list@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Jonathan Corbet <corbet@....net>, linux-spi@...r.kernel.org,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH 05/13] spi: axi-spi-engine: add SPI offload support

On Wed, Jan 10, 2024 at 01:49:46PM -0600, David Lechner wrote:
> This adds an implementation of the SPI offload_ops to the AXI SPI Engine
> driver to provide offload support.
> 
> Offload lookup is done by device property lookup. SPI Engine commands
> and tx data  are recorded by writing to offload-specific FIFOs in the
> SPI Engine hardware.

Glancing through here I'm not seeing anything here that handles DMA
mapping, given that the controller will clearly be doing DMA here that
seems surprising.

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