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Thu, 13 Feb 2025 04:56:40 -0800 Received: from NV-2XGVVG3.nvidia.com (10.127.8.9) by mail.nvidia.com (10.129.68.10) with Microsoft SMTP Server id 15.2.1544.14 via Frontend Transport; Thu, 13 Feb 2025 04:56:35 -0800 From: Kartik Rajput To: , , , , , , , , , , , , , , , , Subject: [PATCH v6 1/2] dt-bindings: serial: Add bindings for nvidia,tegra264-utc Date: Thu, 13 Feb 2025 18:26:11 +0530 Message-ID: <20250213125612.4705-2-kkartik@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250213125612.4705-1-kkartik@nvidia.com> References: <20250213125612.4705-1-kkartik@nvidia.com> Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015C7:EE_|PH0PR12MB5679:EE_ X-MS-Office365-Filtering-Correlation-Id: 7d4c8583-3d69-4ceb-6cb0-08dd4c2de4d8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge2.nvidia.com; CAT:NONE; SFS:(13230040)(7416014)(376014)(36860700013)(1800799024)(82310400026)(921020)(13003099007); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2025 12:56:55.1700 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7d4c8583-3d69-4ceb-6cb0-08dd4c2de4d8 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.161]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015C7.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB5679 The Tegra UTC (UART Trace Controller) allows multiple clients within the Tegra SoC to share a physical UART interface. It supports up to 16 clients. Each client operates as an independent UART endpoint with a dedicated interrupt and 128-character TX/RX FIFOs. Add device tree binding documentation for the Tegra UTC client. Signed-off-by: Kartik Rajput Reviewed-by: Krzysztof Kozlowski --- v1 -> v2: * Removed current-speed as it might not be accurate as the Tegra UTC multiplex data from various clients. * Use 'tx-threshold' and 'rx-threshold' properties defined in serial.yaml instead of 'nvidia,utc-fifo-threshold'. * Add serial.yaml reference. * Define minimum and maximum values for threshold. * Rephrase the documentation to clarify that we are documenting the Tegra UTC clients and not the controller itself. --- .../bindings/serial/nvidia,tegra264-utc.yaml | 73 +++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 Documentation/devicetree/bindings/serial/nvidia,tegra264-utc.yaml diff --git a/Documentation/devicetree/bindings/serial/nvidia,tegra264-utc.yaml b/Documentation/devicetree/bindings/serial/nvidia,tegra264-utc.yaml new file mode 100644 index 000000000000..572cc574da64 --- /dev/null +++ b/Documentation/devicetree/bindings/serial/nvidia,tegra264-utc.yaml @@ -0,0 +1,73 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/serial/nvidia,tegra264-utc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: NVIDIA Tegra UTC (UART Trace Controller) client + +maintainers: + - Kartik Rajput + - Thierry Reding + - Jonathan Hunter + +description: + Represents a client interface of the Tegra UTC (UART Trace Controller). The + Tegra UTC allows multiple clients within the Tegra SoC to share a physical + UART interface. It supports up to 16 clients. Each client operates as an + independent UART endpoint with a dedicated interrupt and 128-character TX/RX + FIFOs. + + The Tegra UTC clients use 8-N-1 configuration and operates on a baudrate + configured by the bootloader at the controller level. + +allOf: + - $ref: serial.yaml# + +properties: + compatible: + const: nvidia,tegra264-utc + + reg: + items: + - description: TX region. + - description: RX region. + + reg-names: + items: + - const: tx + - const: rx + + interrupts: + maxItems: 1 + + tx-threshold: + minimum: 1 + maximum: 128 + + rx-threshold: + minimum: 1 + maximum: 128 + +required: + - compatible + - reg + - reg-names + - interrupts + - tx-threshold + - rx-threshold + +additionalProperties: false + +examples: + - | + #include + + tegra_utc: serial@c4e0000 { + compatible = "nvidia,tegra264-utc"; + reg = <0xc4e0000 0x8000>, <0xc4e8000 0x8000>; + reg-names = "tx", "rx"; + interrupts = ; + tx-threshold = <4>; + rx-threshold = <4>; + };