Re: [PATCH v2 06/10] arm64: allwinner: a64: Add devicetree binding for DMA controller

Maxime Ripard
2017-09-18T08:11:39Z

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On Sun, Sep 17, 2017 at 05:19:52AM +0200, Stefan Brüns wrote:
> The A64 is register compatible with the H3, but has a different number
> of dma channels and request ports.
>
> Attach additional properties to the node to allow future reuse of the
> compatible for controllers with different number of channels/requests.
>
> If dma-requests is not specified, the register layout defined maximum
> of 32 is used.
>
> Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
> ---
> .../devicetree/bindings/dma/sun6i-dma.txt | 26 ++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> index 98fbe1a5c6dd..6ebc79f95202 100644
> --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt
> @@ -27,6 +27,32 @@ Example:
> #dma-cells = <1>;
> };
>
> +------------------------------------------------------------------------------
> +For A64 DMA controller:
> +
> +Required properties:
> +- compatible: "allwinner,sun50i-a64-dma"
> +- dma-channels: Number of DMA channels supported by the controller.
> + Refer to Documentation/devicetree/bindings/dma/dma.txt
> +- all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells
> +
> +Optional properties:
> +- dma-requests: Number of DMA request signals supported by the controller.
> + Refer to Documentation/devicetree/bindings/dma/dma.txt

You're error'ing out if dma-requests, so it isn't optional. I guess we
should just make it mandatory.

Once done,
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>

Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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