From patchwork Fri Jan 5 08:26:42 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: 761749 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 B6C3921A17; Fri, 5 Jan 2024 08:27:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lhvb/brI" Received: by smtp.kernel.org (Postfix) with ESMTPS id 51EA0C433C9; Fri, 5 Jan 2024 08:27:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1704443225; bh=G8eLuVwnsvFwn4kF39vSmn4oX45xzBPrmGlnzDyCVrY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=lhvb/brIwBcIhUY6hJTYMUIz9BRxjoZkiCe4osmeqKEovt4N/1yvHnpZ/muqgJkSY OPJiUewPw7bk42vS3BiOEMHosaFmoaEB+umU1f+gRyOwkxlprKXLhgXHErbzUeFAUJ LPXx0NnBkgv3bTuZSHdCGLJ8rjwraZXD+5DWGWijGXPq/hlPw4C/LPtD8x0i7wMwId IwUx9ubh4M/OsTdtIk2e7JOgAuE+fA/6k0Q7kiCD/JMZaPqrzh2AvO7ZPxJpVxqg9C fwFG6JLrbVdiAkyUX1YAmUYBOK6JpQWiirIrQPg6qbSSxieoRltLhqf3TukB7wAoFG AjoZOdwVcDDSQ== 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 37030C4707B; Fri, 5 Jan 2024 08:27:05 +0000 (UTC) From: Christoph Winklhofer via B4 Relay Date: Fri, 05 Jan 2024 09:26:42 +0100 Subject: [PATCH v3 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: <20240105-w1-uart-v3-1-8687093b2e76@gmail.com> References: <20240105-w1-uart-v3-0-8687093b2e76@gmail.com> In-Reply-To: <20240105-w1-uart-v3-0-8687093b2e76@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=1704443222; l=1794; i=cj.winklhofer@gmail.com; s=20240104; h=from:subject:message-id; bh=mQ67z9MozxmHEO1WDHe54CopgfQx4fCTtQWX0na1aCg=; b=YhCSSb9LicuB5pF3Y8aRvjUrvBF+D+7RDn+7/rpIYWGgWQXV0ZCJP8J7JZAQBxe2GaRDaukJT sgYnkIn+mVzD/FS0UCXTrBJQa9HuNDU8HweE3rd1VxvxnxdwwBqqAy4 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 | 44 +++++++++++++++++++++++ 1 file changed, 44 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..93d83c42c407 --- /dev/null +++ b/Documentation/devicetree/bindings/w1/w1-uart.yaml @@ -0,0 +1,44 @@ +# 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 + +required: + - compatible + +additionalProperties: false + +examples: + - | + serial { + onewire { + compatible = "w1-uart"; + }; + };