* [PATCH] dt-bindings: dma: arm,pl330: Add missing 'iommus' property
@ 2022-07-28 18:55 Rob Herring
2022-07-28 21:50 ` Rob Herring
0 siblings, 1 reply; 2+ messages in thread
From: Rob Herring @ 2022-07-28 18:55 UTC (permalink / raw)
To: Vinod Koul, Krzysztof Kozlowski; +Cc: dmaengine, devicetree, linux-kernel
The pl330 can be behind an IOMMU which is the case for Arm Juno board.
Add the 'iommus' property allowing for 1 IOMMU per channel.
Signed-off-by: Rob Herring <robh@kernel.org>
---
Documentation/devicetree/bindings/dma/arm,pl330.yaml | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/dma/arm,pl330.yaml b/Documentation/devicetree/bindings/dma/arm,pl330.yaml
index 2bec69b308f8..b9c4bee178ae 100644
--- a/Documentation/devicetree/bindings/dma/arm,pl330.yaml
+++ b/Documentation/devicetree/bindings/dma/arm,pl330.yaml
@@ -55,6 +55,11 @@ properties:
dma-coherent: true
+ iommus:
+ minItems: 1
+ maxItems: 8
+ description: Up to 1 IOMMU per DMA channel
+
power-domains:
maxItems: 1
--
2.34.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] dt-bindings: dma: arm,pl330: Add missing 'iommus' property
2022-07-28 18:55 [PATCH] dt-bindings: dma: arm,pl330: Add missing 'iommus' property Rob Herring
@ 2022-07-28 21:50 ` Rob Herring
0 siblings, 0 replies; 2+ messages in thread
From: Rob Herring @ 2022-07-28 21:50 UTC (permalink / raw)
To: Vinod Koul, Krzysztof Kozlowski
Cc: open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM, devicetree,
linux-kernel@vger.kernel.org
On Thu, Jul 28, 2022 at 12:55 PM Rob Herring <robh@kernel.org> wrote:
>
> The pl330 can be behind an IOMMU which is the case for Arm Juno board.
> Add the 'iommus' property allowing for 1 IOMMU per channel.
>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> Documentation/devicetree/bindings/dma/arm,pl330.yaml | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/dma/arm,pl330.yaml b/Documentation/devicetree/bindings/dma/arm,pl330.yaml
> index 2bec69b308f8..b9c4bee178ae 100644
> --- a/Documentation/devicetree/bindings/dma/arm,pl330.yaml
> +++ b/Documentation/devicetree/bindings/dma/arm,pl330.yaml
> @@ -55,6 +55,11 @@ properties:
>
> dma-coherent: true
>
> + iommus:
> + minItems: 1
> + maxItems: 8
Off by 1. Juno has 9 entries. I think it's 8 entries for write the
read side has 1 entry. The TRM isn't too clear.
Rob
> + description: Up to 1 IOMMU per DMA channel
> +
> power-domains:
> maxItems: 1
>
> --
> 2.34.1
>
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