linux-kernel - Re: [PATCH RFC v4 08/15] spi: dt-bindings: axi-spi-engine: add SPI offload properties

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Message-ID: <dbb7a66f236a3cde39acef59cb498b42a6fa9cdd.camel@gmail.com>
Date: Fri, 25 Oct 2024 14:26:31 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: David Lechner <dlechner@...libre.com>, Mark Brown <broonie@...nel.org>, 
 Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Nuno Sá <nuno.sa@...log.com>, Uwe
 Kleine-König <ukleinek@...nel.org>
Cc: Michael Hennerich <Michael.Hennerich@...log.com>, Lars-Peter Clausen
	 <lars@...afoo.de>, David Jander <david@...tonic.nl>, Martin Sperl
	 <kernel@...tin.sperl.org>, linux-spi@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-iio@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: Re: [PATCH RFC v4 08/15] spi: dt-bindings: axi-spi-engine: add SPI
 offload properties

On Wed, 2024-10-23 at 15:59 -0500, David Lechner wrote:
> The AXI SPI Engine has support for hardware offloading capabilities.
> This includes a connection to a DMA controller for streaming RX data
> and a trigger input for starting execution of the SPI message programmed
> in the offload.
> 
> Signed-off-by: David Lechner <dlechner@...libre.com>
> ---
> 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           | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
> b/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
> index d48faa42d025..5281b4871209 100644
> --- a/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
> +++ b/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml
> @@ -41,6 +41,24 @@ properties:
>        - const: s_axi_aclk
>        - const: spi_clk
>  
> +  trigger-sources:
> +    description:
> +      An array of trigger source phandles for offload instances. The index in
> +      the array corresponds to the offload instance number.
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +
> +  dmas:
> +    description:
> +      DMA channels connected to the output stream interface of an offload
> instance.
> +    minItems: 1
> +    maxItems: 32
> +
> +  dma-names:
> +    minItems: 1
> +    maxItems: 32
> +    items:
> +      pattern: "^offload(?:[12]?[0-9]|3[01])-rx$"

I think the core is already capable of tx offload? If so, we could already have that
in the bindings.

- Nuno Sá