linux-kernel - Re: [PATCH v6 06/17] spi: dt-bindings: axi-spi-engine: add SPI offload properties

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Message-ID: <173444599609.1628708.4430713259293370272.robh@kernel.org>
Date: Tue, 17 Dec 2024 08:33:16 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: devicetree@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Martin Sperl <kernel@...tin.sperl.org>, linux-iio@...r.kernel.org,
	linux-pwm@...r.kernel.org,
	Nuno Sá <nuno.sa@...log.com>,
	David Jander <david@...tonic.nl>
Subject: Re: [PATCH v6 06/17] spi: dt-bindings: axi-spi-engine: add SPI
 offload properties


On Wed, 11 Dec 2024 14:54:43 -0600, David Lechner wrote:
> The AXI SPI Engine has support for hardware offloading capabilities.
> This includes a connection to a DMA controller for streaming RX or TX
> data and a trigger input for starting execution of the SPI message
> programmed in the offload. It is designed to support up to 32 offload
> instances.
> 
> Signed-off-by: David Lechner <dlechner@...libre.com>
> ---
> 
> v6 changes:
> * Drop type $ref for trigger-sources property since it is defined
>   elsewhere now
> * Undo v5 changes that limited the number of offloads to 1
> 
> v5 changes:
> * Also document offload0-tx DMA names since the hardware can support
>   that now.
> * Limit the number of offloads to 1 for now since it would require
>   significant hardware changes to actually support more than that.
> 
> v4 changes:
> * Dropped #spi-offload-cells property.
> * Changed subject line.
> 
> v3 changes:
> * Added #spi-offload-cells property.
> * Added properties for triggers and RX data stream connected to DMA.
> 
> v2 changes:
> * This is basically a new patch. It partially replaces "dt-bindings:
>   iio: offload: add binding for PWM/DMA triggered buffer".
> * The controller no longer has an offloads object node and the
>   spi-offloads property is now a standard SPI peripheral property.
> ---
>  .../bindings/spi/adi,axi-spi-engine.yaml           | 24 ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>