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Tue, 31 Mar 2026 03:23:52 -0700 From: Akhil R To: Vinod Koul , Frank Li , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thierry Reding , "Jonathan Hunter" , Laxman Dewangan , Philipp Zabel , , , , CC: Akhil R Subject: [PATCH v6 03/10] dt-bindings: dma: nvidia,tegra186-gpc-dma: Add iommu-map property Date: Tue, 31 Mar 2026 15:52:56 +0530 Message-ID: <20260331102303.33181-4-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260331102303.33181-1-akhilrajeev@nvidia.com> References: <20260331102303.33181-1-akhilrajeev@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000252A2:EE_|DS5PPFEC0C6BDA1:EE_ X-MS-Office365-Filtering-Correlation-Id: 0d8b724c-cb9c-4b81-c823-08de8f0fa6db X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|1800799024|376014|7416014|82310400026|921020|18002099003|56012099003|22082099003; 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charset="utf-8" Add iommu-map property to specify separate stream IDs for each DMA channel. This enables each channel to be in its own IOMMU domain, keeping memory isolated from other devices sharing the same DMA controller. Define the constraints such that if the channel and stream IDs are contiguous, a single entry can map all the channels, but if the channels or stream IDs are non-contiguous support multiple entries. Signed-off-by: Akhil R Acked-by: Rob Herring (Arm) --- .../devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.= yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml index 64f1e9d9896d..bc093c783d98 100644 --- a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml @@ -14,6 +14,7 @@ description: | maintainers: - Jon Hunter - Rajesh Gumasta + - Akhil R =20 properties: compatible: @@ -49,6 +50,14 @@ properties: iommus: maxItems: 1 =20 + iommu-map: + description: + Maps DMA channel numbers to IOMMU stream IDs. A single entry can map= all + channels when stream IDs are contiguous. In systems where the channe= ls or + stream IDs are not contiguous, multiple entries may be needed. + minItems: 1 + maxItems: 32 + dma-coherent: true =20 dma-channel-mask: --=20 2.50.1