linux-kernel - Re: [PATCH v5 2/2] arm64: dts: intel: agilex5: Add simple-bus node on top of dma controller node

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Message-ID: <e10dd345-01e6-4be7-bd9d-d0a464aa679e@kernel.org>
Date: Fri, 2 Jan 2026 07:52:20 -0600
From: Dinh Nguyen <dinguyen@...nel.org>
To: Khairul Anuar Romli <khairul.anuar.romli@...era.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>, Vinod Koul
 <vkoul@...nel.org>, dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] arm64: dts: intel: agilex5: Add simple-bus node on
 top of dma controller node



On 12/28/25 21:49, Khairul Anuar Romli wrote:
> Move dma-controller node under simple-bus node to allow bus node specific
> property able to be properly defined. This is require to fulfill Agilex5
> bus limitation that is limited to 40-addressable-bit.
> 
> Update the compatible string for the DMA controller nodes in the Agilex5
> device tree from the generic "snps,axi-dma-1.01a" to the platform-specific
> "altr,agilex5-axi-dma". Add fallback capability to ensure driver is able
> to initialize properly.
> 
> This change enables the use of platform-specific features and constraints
> in the driver, such as setting a 40-bit DMA addressable mask through
> dma-ranges, which is required for Agilex5. It also aligns with the updated
> device tree bindings and driver support for this compatible string.
> 
> Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
> ---
> Changes in v5:
> 	- No changes.
> Changes in v4:
> 	- No changes.
> Changes in v3:
> 	- Rename the patch  "arm64: dts: intel: agilex5: Add dma-ranges, address
> 	  and size cells to dma node"
> 	- Add simple-bus and move dmac0 and dmac1 1 level down.
> Changes in v2:
> 	- Rename the from add platform specific to add dma-ranges, address
> 	  and size cells.
> 	- Define address-cells and size-cells for dmac0 and dmac1
> 	- Add dma-ranges for agilex5 for 40-bit
> ---
>   .../arm64/boot/dts/intel/socfpga_agilex5.dtsi | 78 ++++++++++---------
>   .../arm64/boot/dts/intel/socfpga_agilex5.dtsi | 78 ++++++++++---------
>   1 file changed, 43 insertions(+), 35 deletions(-)
> 

Applied!

Thanks,
Dinh