linux-kernel - Re: [PATCH] spi: dt-bindings: samsung: make dma properties not required

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Date: Fri, 1 Mar 2024 13:28:35 -0600
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: andi.shyti@...nel.org, broonie@...nel.org, robh+dt@...nel.org, 
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	linux-spi@...r.kernel.org, linux-samsung-soc@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	andre.draszik@...aro.org, peter.griffin@...aro.org, willmcvicker@...gle.com, 
	kernel-team@...roid.com
Subject: Re: [PATCH] spi: dt-bindings: samsung: make dma properties not required

On Fri, Mar 1, 2024 at 5:55 AM Tudor Ambarus <tudor.ambarus@...aro.org> wrote:
>
> Since the addition of the driver in 2009, the driver selects between DMA
> and polling mode depending on the transfer length - DMA mode for
> transfers bigger than the FIFO depth, polling mode otherwise. All
> versions of the IP support polling mode, make the dma properties not
> required.
>

AFAIU, the device tree has nothing to do with drivers, it's about
hardware description. Does making DMA properties not required here
mean that there are some HW out there which doesn't integrate DMA in
SPI blocks? Even if this change is ok (I'm not sure), the
argumentation doesn't look sound to me.

> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> ---
>  Documentation/devicetree/bindings/spi/samsung,spi.yaml | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/spi/samsung,spi.yaml b/Documentation/devicetree/bindings/spi/samsung,spi.yaml
> index 2f0a0835ecfb..f681372da81f 100644
> --- a/Documentation/devicetree/bindings/spi/samsung,spi.yaml
> +++ b/Documentation/devicetree/bindings/spi/samsung,spi.yaml
> @@ -76,8 +76,6 @@ required:
>    - compatible
>    - clocks
>    - clock-names
> -  - dmas
> -  - dma-names
>    - interrupts
>    - reg
>
> --
> 2.44.0.278.ge034bb2e1d-goog
>