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Mon, 27 Jan 2025 22:46:54 -0800 Received: from NV-2XGVVG3.nvidia.com (10.127.8.10) by mail.nvidia.com (10.126.190.181) with Microsoft SMTP Server id 15.2.1544.14 via Frontend Transport; Mon, 27 Jan 2025 22:46:49 -0800 From: Kartik Rajput To: , , , , , , , , , , , , , , , , Subject: [PATCH 1/2] dt-bindings: serial: Add bindings for nvidia, tegra264-utc Date: Tue, 28 Jan 2025 12:16:32 +0530 Message-ID: <20250128064633.12381-2-kkartik@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250128064633.12381-1-kkartik@nvidia.com> References: <20250128064633.12381-1-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: SJ1PEPF000023CF:EE_|CH3PR12MB8994:EE_ X-MS-Office365-Filtering-Correlation-Id: ad19736a-58e1-4919-c9c8-08dd3f6791d4 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:dc7edge1.nvidia.com; CAT:NONE; SFS:(13230040)(36860700013)(82310400026)(7416014)(376014)(1800799024)(13003099007)(921020); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jan 2025 06:47:01.6988 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ad19736a-58e1-4919-c9c8-08dd3f6791d4 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.118.232]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000023CF.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8994 The Tegra UTC (UART Trace Controller) is a HW based serial port that allows multiplexing multiple data streams of up to 16 UTC clients into a single hardware serial port. Add bindings for the Tegra UTC client device. Signed-off-by: Kartik Rajput --- .../bindings/serial/nvidia,tegra264-utc.yaml | 83 +++++++++++++++++++ 1 file changed, 83 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..63ba3655451f --- /dev/null +++ b/Documentation/devicetree/bindings/serial/nvidia,tegra264-utc.yaml @@ -0,0 +1,83 @@ +# 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 UART Trace Controller (UTC) client + +maintainers: + - Kartik Rajput + - Thierry Reding + - Jonathan Hunter + +description: + The Tegra UTC (UART Trace Controller) is a hardware controller that + allows multiple systems within the Tegra SoC to share a hardware UART + interface. It supports up to 16 clients, with each client having its own + interrupt and a FIFO buffer for both RX (receive) and TX (transmit), each + capable of holding 128 characters. + + The Tegra UTC uses 8-N-1 configuration and operates on a pre-configured + baudrate, which is configured by the bootloader. + +properties: + $nodename: + pattern: "^serial(@.*)?$" + + compatible: + const: nvidia,tegra264-utc + + reg: + items: + - description: Register region for TX client. + - description: Register region for RX client. + minItems: 2 + + reg-names: + items: + - const: tx + - const: rx + minItems: 2 + + interrupts: + maxItems: 1 + + current-speed: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + This property specifies the baudrate at which the Tegra UTC is + operating. + + nvidia,utc-fifo-threshold: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + This property specifies the UTC TX and RX client FIFO threshold in + terms of occupancy. + + This property should have the same value as the burst size (number + of characters read by the Tegra UTC hardware at a time from each + client) which is configured by the bootloader. + +required: + - compatible + - reg + - reg-names + - interrupts + - current-speed + - nvidia,utc-fifo-threshold + +additionalProperties: false + +examples: + - | + #include + + tegra_utc: serial@c4e0000 { + compatible = "nvidia,tegra264-utc"; + reg = <0xc4e0000 0x8000>, <0xc4e8000 0x8000>; + reg-names = "tx", "rx"; + interrupts = ; + current-speed = <115200>; + nvidia,utc-fifo-threshold = <4>; + };