From patchwork Wed Feb 14 06:36:14 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: 772808 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 37D9311193; Wed, 14 Feb 2024 06:36:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707892584; cv=none; b=OFmY/CXufpSBlRsBvJg8aeP/U7auRMtbWu63J2Ft0ArZtIFp7d0wnMlNuIR4TahuAeum/53kYr8pqyfX54zQJu76oXaRIIB0npTrjQPGlkZdDCbX0na5KxekiflyLTlWD1jGKYDK9NUEGl3t84oGBgGFVtsrrd+fciaq5iS5HYI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707892584; c=relaxed/simple; bh=eMfD7O3mKBgytq6cqeXHFyoxCZgEikAzzCVwKh35KmQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=luLtjAPRmyheptS39xCkefnWHiKBvsPRetgLWqfsp/EqXjXHsOhkIOv1Vz7xLc6TSQZHLOXOQlFROUS+IktYAmK+JP6wXNUiUvbeRtYqdN+yPoYC8L8/hR9m79EFTLWAnLE8VxenqB5iVqcyPA2Anp8YbQFhpdpu2w9IAn2sOVA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nkD7FZ9G; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nkD7FZ9G" Received: by smtp.kernel.org (Postfix) with ESMTPS id CEC07C43390; Wed, 14 Feb 2024 06:36:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707892583; bh=eMfD7O3mKBgytq6cqeXHFyoxCZgEikAzzCVwKh35KmQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=nkD7FZ9GsL5MU5+3M1s2IwTCiv4bAdPmDDV6PpAAjtUydJ6wZhho1+vkQyVbe8IVz CYlgHW6NVlzCnP0LDTCCiZ9nf+dZTpxgAdtmpHfBmcsjcy9JgmBapGJj4AC0gTc5kq uw7jvJzDY1YRJr22WmdmmOfom5Y9w+cD2i1OQqqsWU3c57G9TwIObCPKu/ou/aIGnF gpSIwwoHuQDr5Q/qMfgU1R+WfOghHKKhN76Pq1RGcR4gMwY2qmUtLtf7GvQnjYye35 XM7/p8+oq+Eb0KP/TvXzNSOP6YeAltNwkkolfX9VLHqmDbNVUw/+By1zYnmL3FPt8y 7XoITRFFWI4cQ== 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 B2370C48BEB; Wed, 14 Feb 2024 06:36:23 +0000 (UTC) From: Christoph Winklhofer via B4 Relay Date: Wed, 14 Feb 2024 07:36:14 +0100 Subject: [PATCH v7 2/3] 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: <20240214-w1-uart-v7-2-6e21fa24e066@gmail.com> References: <20240214-w1-uart-v7-0-6e21fa24e066@gmail.com> In-Reply-To: <20240214-w1-uart-v7-0-6e21fa24e066@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=1707892581; l=2213; i=cj.winklhofer@gmail.com; s=20240104; h=from:subject:message-id; bh=yLV7IXmfdL8oY7fuePFUPpVLjP+tA63tYbAEut11d5g=; b=92emIKE9Ak5J2oB0JGnAAtKQWiPr0DGMmL4XQKKeyWWY2JOcZvn2YQJiHdw50/TNkXo5HMTQ8 g0MsLndArVLDR3etY1s2hi3m7fzx/hOe9lC//yYky3eadru94LnkRzY 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. Reviewed-by: Rob Herring Signed-off-by: Christoph Winklhofer --- Documentation/devicetree/bindings/w1/w1-uart.yaml | 60 +++++++++++++++++++++++ 1 file changed, 60 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..7173820c78f9 --- /dev/null +++ b/Documentation/devicetree/bindings/w1/w1-uart.yaml @@ -0,0 +1,60 @@ +# 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-bps: + default: 9600 + description: + The baud rate for the 1-Wire reset and presence detect. + + write-0-bps: + default: 115200 + description: + The baud rate for the 1-Wire write-0 cycle. + + write-1-bps: + default: 115200 + description: + The baud rate for the 1-Wire write-1 and read cycle. + +required: + - compatible + +additionalProperties: + type: object + +examples: + - | + serial { + onewire { + compatible = "w1-uart"; + }; + };