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 5D88EC77B7C for ; Thu, 4 May 2023 13:15:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230315AbjEDNPM (ORCPT ); Thu, 4 May 2023 09:15:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229606AbjEDNPK (ORCPT ); Thu, 4 May 2023 09:15:10 -0400 Received: from connect.vanmierlo.com (fieber.vanmierlo.com [84.243.197.177]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BBC1B6194 for ; Thu, 4 May 2023 06:15:09 -0700 (PDT) X-Footer: dmFubWllcmxvLmNvbQ== Received: from roundcube.vanmierlo.com ([192.168.37.37]) (authenticated user m.brock@vanmierlo.com) by connect.vanmierlo.com (Kerio Connect 9.4.2) with ESMTPA; Thu, 4 May 2023 14:14:33 +0200 MIME-Version: 1.0 Date: Thu, 04 May 2023 14:14:33 +0200 From: m.brock@vanmierlo.com To: "Guntupalli, Manikanta" Cc: Rob Herring , gregkh@linuxfoundation.org, krzysztof.kozlowski+dt@linaro.org, michal.simek@xilinx.com, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, jirislaby@kernel.org, linux-arm-kernel@lists.infradead.org, "Simek, Michal" , "git (AMD-Xilinx)" , "Pandey, Radhey Shyam" , "Datta, Shubhrajyoti" , "Goud, Srinivas" , manion05gk@gmail.com Subject: Re: [PATCH 1/2] dt-bindings: Add optional gpio property to uartps node to support rs485 In-Reply-To: References: <1682512187-8828-1-git-send-email-manikanta.guntupalli@amd.com> <1682512187-8828-2-git-send-email-manikanta.guntupalli@amd.com> <20230427164351.GA3146210-robh@kernel.org> Message-ID: <4f59ac40e5dabab01560888782f7ea0d@vanmierlo.com> X-Sender: m.brock@vanmierlo.com Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Guntupalli, Manikanta wrote 2023-05-02 12:14: >> > + txrx-gpios: >> > + description: Optional GPIO to switch transmit and receive modes via >> pmod. >> >> What's pmod? > Pmod is galvanically-isolated RS-485/RS-422 transceivers with a > built-in isolated DC-DC converter, that eliminates the need for a > separate isolated power supply in space constrained isolated designs. AFAIK Pmod is an open standard connector by Digilent and present on many Xilinx demo boards. It does not involve any galvanic isolation. https://digilent.com/reference/_media/reference/pmod/pmod-interface-specification-1_3_1.pdf The ISOW14x2 on the particular board you're using does however give isolation. But you cannot name that board Pmod. Maarten