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Mon, 30 Mar 2026 07:45:16 -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 v5 01/10] dt-bindings: dma: nvidia,tegra186-gpc-dma: Make reset optional Date: Mon, 30 Mar 2026 20:14:47 +0530 Message-ID: <20260330144456.13551-2-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260330144456.13551-1-akhilrajeev@nvidia.com> References: <20260330144456.13551-1-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: CY4PEPF0000EE3E:EE_|SA5PPFB9BA66B77:EE_ X-MS-Office365-Filtering-Correlation-Id: ae29e5cf-8216-47b0-a4b2-08de8e6b0578 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|1800799024|7416014|376014|82310400026|921020|56012099003|22082099003|18002099003; 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charset="utf-8" On Tegra264, GPCDMA reset control is not exposed to Linux and is handled by the boot firmware. Although reset was not exposed in Tegra234 as well, the firmware supported a dummy reset which just returns success on reset without doing an actual reset. This is also not supported in Tegra264 BPMP. Therefore mark 'reset' and 'reset-names' properties as required only for devices prior to Tegra264. This also necessitates that the Tegra264 compatible be standalone and cannot have the fallback compatible of Tegra186. Since there is no functional impact, we keep reset as required for Tegra234 to avoid breaking the ABI. Fixes: bb8c97571db5 ("dt-bindings: dma: Add Tegra264 compatible string") Signed-off-by: Akhil R Acked-by: Rob Herring (Arm) --- .../bindings/dma/nvidia,tegra186-gpc-dma.yaml | 23 +++++++++++++------ 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.= yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml index 0dabe9bbb219..64f1e9d9896d 100644 --- a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml @@ -15,16 +15,14 @@ maintainers: - Jon Hunter - Rajesh Gumasta =20 -allOf: - - $ref: dma-controller.yaml# - properties: compatible: oneOf: - - const: nvidia,tegra186-gpcdma + - enum: + - nvidia,tegra264-gpcdma + - nvidia,tegra186-gpcdma - items: - enum: - - nvidia,tegra264-gpcdma - nvidia,tegra234-gpcdma - nvidia,tegra194-gpcdma - const: nvidia,tegra186-gpcdma @@ -60,12 +58,23 @@ required: - compatible - reg - interrupts - - resets - - reset-names - "#dma-cells" - iommus - dma-channel-mask =20 +allOf: + - $ref: dma-controller.yaml# + - if: + properties: + compatible: + contains: + enum: + - nvidia,tegra186-gpcdma + then: + required: + - resets + - reset-names + additionalProperties: false =20 examples: --=20 2.50.1