From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D71C8C4321E for ; Wed, 30 Nov 2022 21:15:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229720AbiK3VPl (ORCPT ); Wed, 30 Nov 2022 16:15:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229448AbiK3VPk (ORCPT ); Wed, 30 Nov 2022 16:15:40 -0500 Received: from mail-oi1-f175.google.com (mail-oi1-f175.google.com [209.85.167.175]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6CEB6862F3; Wed, 30 Nov 2022 13:15:39 -0800 (PST) Received: by mail-oi1-f175.google.com with SMTP id l127so20180356oia.8; Wed, 30 Nov 2022 13:15:39 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=g1WUj9zWyrC1e+L03kFAp89FihCih368o6/AwASOyaI=; b=RDKOeqRLUAVYO3dfz3TjOsRsDx6rj0q4dYWwvfjXSJAKskBjKX9N7RnS1nqlxHziC8 TERlUxxGWUvd4RWGj12+XYYAShh9abGr8nAfBI0P4HkK4eOlnzntp7WX6Hy9AV9HMgEh dpZkixxTC63wI8sv5BjCAUR32PVhT8Gg7D25ngwH4/aBMjUpLuyAizLB3lYcOCz7dMMY GeJJdVnsYspZ6gW2F4S+qwkFZH9hNgojKuAHNlU8MP6faqOCgnOruX5g/TMAFknO8DPP UbvEpDmYJrqmhzjllkbDsUYmwes3Hw8PMm1N+wTLMbxQNx/VXIy+kQUFVYyoWaMeQQeX dRfw== X-Gm-Message-State: ANoB5pkyKbUudRqa4fbM4vN9eZxl0eIT33Gw101gzmOexI181512XikT qTpIFVEiE1d+JxtKArQjCA== X-Google-Smtp-Source: AA0mqf7zSC9P3R1awSY68MbRIxwFiUbYKx3tCXC89GAfio9L+8bZVQDPRbJusHthEFH2YarrfOv9Rg== X-Received: by 2002:a05:6808:120f:b0:359:d3d6:45d2 with SMTP id a15-20020a056808120f00b00359d3d645d2mr31033386oil.132.1669842938657; Wed, 30 Nov 2022 13:15:38 -0800 (PST) Received: from robh_at_kernel.org (66-90-144-107.dyn.grandenetworks.net. [66.90.144.107]) by smtp.gmail.com with ESMTPSA id w22-20020a9d77d6000000b0066c495a651dsm1350898otl.38.2022.11.30.13.15.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Nov 2022 13:15:37 -0800 (PST) Received: (nullmailer pid 2940448 invoked by uid 1000); Wed, 30 Nov 2022 21:15:37 -0000 Date: Wed, 30 Nov 2022 15:15:37 -0600 From: Rob Herring To: Christoph Niedermaier Cc: linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, krzysztof.kozlowski+dt@linaro.org, marex@denx.de, jirislaby@kernel.org, Greg Kroah-Hartman , Alexander Dahl , kernel@dh-electronics.com, devicetree@vger.kernel.org Subject: Re: [PATCH V2 1/4] dt_bindings: rs485: Add binding for GPIO that controls Rx enable during Tx Message-ID: <20221130211537.GA2926121-robh@kernel.org> References: <20221123123004.7216-1-cniedermaier@dh-electronics.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20221123123004.7216-1-cniedermaier@dh-electronics.com> Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org On Wed, Nov 23, 2022 at 01:30:01PM +0100, Christoph Niedermaier wrote: > This patch adds a binding for a generic definition of an output GPIO that > indicates the state of rs485-rx-during-tx. The idea is that the hardware > already controls the option receiving during sending before it gets to the > signal receiving hardware. The standard RS485 is a half-duplex bus that in > most cases is driven by an UART controller. The advantage of using this > GPIO is that it is independent of the capabilities of the UART core and > the UART driver. On the hardware side the interface to the bus is > controlled by a transceiver, that has a pin called RE (RX enable) or > similar, which connects the bus to the RX signal of the UART controller. > The GPIO can switch between two states to control the RE pin via an > electrical circuit: > - Active: > The RE pin is always active. The UART RX see everything on the bus and > therefore also what happens with the TX signal on the bus. > - Inactive: > The RE pin is always active, but during sending on the bus the pin RE is > inactive. So basically the receiving during sending is suppressed. > > A possible circuit diagram could look like this: > ┌──────────────────┐ > │ RS485 │ > TX ───────────────┤D │ > │ Transceiver │ > RTS ────┬──────────┤DE │ > │ │ │ > │ ┌─────┐ │ │ > └─┤& │ │ │ > │ ├──┤!RE │ > !rx_during_tx_gpio ──────┤ │ │ │ > └─────┘ │ │ > │ │ > RX ───────────────┤R │ > │ │ > └──────────────────┘ > > Here the RTS pin of the UART core is used to control TX via the transceiver > pin DE (Drive Enable). RE and rx_during_tx_gpio are active low. > > Signed-off-by: Christoph Niedermaier > --- > Cc: Greg Kroah-Hartman > Cc: Rob Herring > Cc: Krzysztof Kozlowski > Cc: Alexander Dahl > Cc: Marek Vasut > Cc: kernel@dh-electronics.com > Cc: devicetree@vger.kernel.org > To: linux-serial@vger.kernel.org > To: linux-arm-kernel@lists.infradead.org > --- > V2: - Rework of the commit message > - Rework GPIO property comment > --- > Documentation/devicetree/bindings/serial/rs485.yaml | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml > index 90a1bab40f05..6d780911e342 100644 > --- a/Documentation/devicetree/bindings/serial/rs485.yaml > +++ b/Documentation/devicetree/bindings/serial/rs485.yaml > @@ -51,6 +51,10 @@ properties: > description: GPIO pin to enable RS485 bus termination. > maxItems: 1 > > + rs485-rx-during-tx-gpios: > + description: Output GPIO pin that indicates the state of rs485-rx-during-tx. An output sets the state. An input samples or indicates the state. This should include something about the active state: The active state enables RX during TX. > + maxItems: 1 > + > additionalProperties: true > > ... > -- > 2.11.0 > > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 59A6BC4321E for ; Wed, 30 Nov 2022 21:16:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=lnsDT8MB+AV1SPIdWNcFUvAZv+QwVYviCmhQLROKGiY=; b=ZIWuwwYfgzk27z 9o0khnYZTlCrYH8utK7xNW726DnFfTUW2UQqmNIageyr04CtXPOb2NOzUK2+tMqzAF2I1ewgkLbL3 JmTU3eYXAB6AfvhJ8k16d5JUlfe84+mqkc0Qsu9JsoZ2nw/Rawfqb5i5KHeym8z/CNtxoUvUUHZk8 gT1ORP8lb+QeKkm6lAo9BrhDk7z7RUmydFDRjx6YmcZX+nkrszQlWrTFhrbCvtiJ3ZasNAKqtO+Di 9BK7TRNXYX6HOQ0/noKGhlYiwrxv3I9gy7sp8QXvwlTVCaAL7+EuJGp6i52n10WZX/NBLfROtGW13 j0dPObTsjXTCVRjZ0vpg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p0UQi-002iYa-4p; Wed, 30 Nov 2022 21:15:44 +0000 Received: from mail-oi1-f179.google.com ([209.85.167.179]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1p0UQe-002iX2-NM for linux-arm-kernel@lists.infradead.org; Wed, 30 Nov 2022 21:15:42 +0000 Received: by mail-oi1-f179.google.com with SMTP id c129so22681oia.0 for ; Wed, 30 Nov 2022 13:15:39 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=g1WUj9zWyrC1e+L03kFAp89FihCih368o6/AwASOyaI=; b=AroRy6gterURPN6T1Ci7v6uvwU7dUnBnp8OMj3lkiaWSLiBtNxfZjwiEbsbw89SfC/ fTvIS1CAItQnM5490QlBS2L9hetCVvzoGZgSnsbk2qO68Me0oSCXHFVx2qsmE/1KK8// 5Ue7pOcZPFClYRP3Ga+KtSVpj4fZ0svEOt52NUCRKIRLfwEszOJWnwAzKTFEsoFkBjZ2 SsEwVKyDqDaMgazwHLtsUgn39B9HaZ892Hayz1QEw1A2OOcqR/LK99gDlW95OQB0WDr7 CGVG2Du4c6yZd9gGnM5697TyE5evnljr3q7nEV5rsrdk4FNgaJbS1eAr3MDAeDncZjYG YORw== X-Gm-Message-State: ANoB5pndySN3y3WMy3dezLNtPTldSKWb1NOHWRrSVxY8ACpTnS8+ZpjO C6xDgaZ5PiAENXra4bU0Sg== X-Google-Smtp-Source: AA0mqf7zSC9P3R1awSY68MbRIxwFiUbYKx3tCXC89GAfio9L+8bZVQDPRbJusHthEFH2YarrfOv9Rg== X-Received: by 2002:a05:6808:120f:b0:359:d3d6:45d2 with SMTP id a15-20020a056808120f00b00359d3d645d2mr31033386oil.132.1669842938657; Wed, 30 Nov 2022 13:15:38 -0800 (PST) Received: from robh_at_kernel.org (66-90-144-107.dyn.grandenetworks.net. 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