From patchwork Sat Jan 6 16:02:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Winklhofer via B4 Relay X-Patchwork-Id: 761737 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C17DC846F; Sat, 6 Jan 2024 16:02:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="HZ/9496T" Received: by smtp.kernel.org (Postfix) with ESMTPS id 3CC08C433C9; Sat, 6 Jan 2024 16:02:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1704556947; bh=CyM+dK81AY1GNze7Q8lQ3o9F39LiJRzCOqn3mymlsFA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=HZ/9496TlKf4v2wV7fF+9NcTM9dHMCQXAcuuMIVE4Hf2npLU+aBIP13h7taxNKweL CdBEFlAlaZessnSINFRDXLEXwctVsGzcWGMAculhsm6vtjTiTHDUipkb6xgi63pg2z pNRoe7lzUz9ymDNXH9gpEKGTqgplPrQUKUl4l1kIQ0jbqhk0JSJZrd0G/BRoke5+NU MLN1GZmBLM6PDKBqTV4l0ZhSUFIiOBeDR94sZqC8oEySftYvX+Pi+jeTObESrVheVm fNMa3xdj5rbU8lLOKm/hmRpjdAyD6wlKo1RJfDYaUo1g81NydRk0ocL0sIjzSZg0af ZpNv5IRQIpJDA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 221D4C47079; Sat, 6 Jan 2024 16:02:27 +0000 (UTC) From: Christoph Winklhofer via B4 Relay Date: Sat, 06 Jan 2024 17:02:24 +0100 Subject: [PATCH v4 1/3] dt-bindings: w1: UART 1-Wire bus Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240106-w1-uart-v4-1-7fe1378a8b3e@gmail.com> References: <20240106-w1-uart-v4-0-7fe1378a8b3e@gmail.com> In-Reply-To: <20240106-w1-uart-v4-0-7fe1378a8b3e@gmail.com> To: Krzysztof Kozlowski , Rob Herring , Conor Dooley , Christoph Winklhofer , Rob Herring , Greg Kroah-Hartman , Jiri Slaby , Krzysztof Kozlowski , Jonathan Corbet Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, linux-doc@vger.kernel.org X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1704556945; l=2346; i=cj.winklhofer@gmail.com; s=20240104; h=from:subject:message-id; bh=GIA/37nqwlMBtA6FnEHKs8XRjdXS3bL5cBDD0chGbYE=; b=M9HnA7l2nrFyCHwVTBHbWDWAg2k8moEEOvGkn+dsZ/9+/tDbjI2gkLt8m2R2tMuZtV1oBBsEM fwu0Ljq8EFNCw9b3ffM+i852WMaMePLLihudoO6BHBUfjhd9wuHthLd X-Developer-Key: i=cj.winklhofer@gmail.com; a=ed25519; pk=lgjGjOt7hFKJT9UXhgUyrdthxvZ7DJ5F1U/7d9qdAsk= X-Endpoint-Received: by B4 Relay for cj.winklhofer@gmail.com/20240104 with auth_id=111 X-Original-From: Christoph Winklhofer Reply-To: From: Christoph Winklhofer Add device tree binding for UART 1-Wire bus. Signed-off-by: Christoph Winklhofer --- Documentation/devicetree/bindings/w1/w1-uart.yaml | 62 +++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/Documentation/devicetree/bindings/w1/w1-uart.yaml b/Documentation/devicetree/bindings/w1/w1-uart.yaml new file mode 100644 index 000000000000..6b90693b2ca0 --- /dev/null +++ b/Documentation/devicetree/bindings/w1/w1-uart.yaml @@ -0,0 +1,62 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/w1/w1-uart.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: UART 1-Wire Bus + +maintainers: + - Christoph Winklhofer + +description: | + UART 1-wire bus. Utilizes the UART interface via the Serial Device Bus + to create the 1-Wire timing patterns. + + The UART peripheral must support full-duplex and operate in open-drain + mode. The timing patterns are generated by a specific combination of + baud-rate and transmitted byte, which corresponds to a 1-Wire read bit, + write bit or reset pulse. + + The default baud-rate for reset and presence detection is 9600 and for + a 1-Wire read or write operation 115200. In case the actual baud-rate + is different from the requested one, the transmitted byte is adapted + to generate the 1-Wire timing patterns. + + https://www.analog.com/en/technical-articles/using-a-uart-to-implement-a-1wire-bus-master.html + + +properties: + compatible: + const: w1-uart + + reset-speed: + $ref: /schemas/types.yaml#/definitions/uint32 + default: 9600 + description: | + The baud rate for the 1-Wire reset and presence detect. + + touch_0-speed: + $ref: /schemas/types.yaml#/definitions/uint32 + default: 115200 + description: | + The baud rate for the 1-Wire write-0 cycle (touch bit 0). + + touch_1-speed: + $ref: /schemas/types.yaml#/definitions/uint32 + default: 115200 + description: | + The baud rate for the 1-Wire write-1 and read cycle (touch bit 1). + +required: + - compatible + +additionalProperties: false + +examples: + - | + serial { + onewire { + compatible = "w1-uart"; + }; + };