linux-kernel - Re: [PATCH 03/10] dt-bindings: dma: Add RDA IFC DMA

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Message-ID: <20250922180851.GB547468-robh@kernel.org>
Date: Mon, 22 Sep 2025 13:08:51 -0500
From: Rob Herring <robh@...nel.org>
To: Dang Huynh <dang.huynh@...nlining.org>
Cc: Manivannan Sadhasivam <mani@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Philipp Zabel <p.zabel@...gutronix.de>, Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-unisoc@...ts.infradead.org, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-clk@...r.kernel.org, dmaengine@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 03/10] dt-bindings: dma: Add RDA IFC DMA

On Fri, Sep 19, 2025 at 01:48:43AM +0700, Dang Huynh wrote:
> The Intelligent Flow Controller (IFC) is a scatter/gather DMA
> controller.
> 
> Signed-off-by: Dang Huynh <dang.huynh@...nlining.org>
> ---
>  Documentation/devicetree/bindings/dma/rda,ifc.yaml | 45 ++++++++++++++++++++++
>  include/dt-bindings/dma/rda-ifc.h                  | 28 ++++++++++++++
>  2 files changed, 73 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/dma/rda,ifc.yaml b/Documentation/devicetree/bindings/dma/rda,ifc.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..323e1e87cee09cfc7b64bf44bef61e4d1e91afa5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/rda,ifc.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/rda,ifc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: RDA Intelligent Flow Controller (IFC)
> +
> +maintainers:
> +  - Dang Huynh <dang.huynh@...nlining.org>
> +
> +description: |
> +  RDA IFC is a DMA controller, it only supports scatter/gather lists.
> +
> +allOf:
> +  - $ref: dma-controller.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - rda,8810pl-ifc
> +      - const: rda,ifc

Also, drop. Generic compatibles are rarely useful. If the next chip has 
the same block, then 'rda,8810pl-ifc' can be the fallback compatible.

Rob