From patchwork Wed Feb 26 22:23:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: George Hilliard X-Patchwork-Id: 214243 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1805FC4BA2D for ; Wed, 26 Feb 2020 22:23:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E1BAD24670 for ; Wed, 26 Feb 2020 22:23:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kopismobile-com.20150623.gappssmtp.com header.i=@kopismobile-com.20150623.gappssmtp.com header.b="wZYkr7JB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727925AbgBZWXf (ORCPT ); Wed, 26 Feb 2020 17:23:35 -0500 Received: from mail-ot1-f65.google.com ([209.85.210.65]:37470 "EHLO mail-ot1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727757AbgBZWXe (ORCPT ); Wed, 26 Feb 2020 17:23:34 -0500 Received: by mail-ot1-f65.google.com with SMTP id b3so1038634otp.4 for ; Wed, 26 Feb 2020 14:23:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kopismobile-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=pfUf4spEhkDBmKxyxMorooyDLjAKRPJLyckzruXNUbg=; b=wZYkr7JBtdoc5YuzjF3ohzPAVDJ1gnRZjKmKJAFSt/LvVdTzc/ObarwxW+Bfdg0qsO GL/MnvZ3yJNOS9OYbhuim58B12tHPBcZ5hMil2MR9CQlrzjgrVX0oTW5g0cuuvr/TYUD A9wRyDpW6BvopIGKAfqgmPhJCQ8+DdSWS71A2JthVnFXEfX3H/uw7zrK96geumE2yg87 O+abf6qnRXqoff+ABDXk0afpLrELFb3v6f0+PvdILW5xN41xRP1RVZTITIbBJwfZgFME xPFOCujPruB9hRVoqFBJSv2/wTfedfZR7L4GLC7Gj+UEFKqI5wuq+/M6Vo7zt8/pyHXC q/dA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=pfUf4spEhkDBmKxyxMorooyDLjAKRPJLyckzruXNUbg=; b=nYN9uTNQ8F/D+PdoagkTRxColtbw89+aB0nBlxCWA5QOlwKx2DhDfFXtAY+VMKJKwj /EDELCmHEy3yp7edZZ2SlRxoSf2qyiGGh8Y+G0BDFfPkl8qbalBZUWne9ytGaSdvc3A8 6WtRTszI4ArJ78wkqpouLqKiIxs18WY2e5DapbCNZhB7sxcoz9NyGJRSrntF9ppjk6bl lJUZARa0mh8WR2KKzi6JhQBhj9zedD5neltxQyZFpgfi4fjRfXXm3aFcUiC/pPokHvVR bVLddJLVRZ/VFMPj3jQehWi0kmq7RFdgS0JHoFPLCnChc2n788XopXbJ+Sm6XZaKNxvG Ha6A== X-Gm-Message-State: APjAAAXjZNZ8wlNe518/pHFryhxRLos0n1ASalUCa9tSFyAcBiPufgAT YkZUjjR9FTmeP578C7eq2PRTew== X-Google-Smtp-Source: APXvYqzH14hksfq8W/t4RGgz57wk9GHGGZP32bA2kV+roi7VwOltmEnTMtsVyCnxC1QyoQwXk/+3Yw== X-Received: by 2002:a05:6830:145:: with SMTP id j5mr812538otp.242.1582755812741; Wed, 26 Feb 2020 14:23:32 -0800 (PST) Received: from farregard-ubuntu.kopismobile.org (c-73-177-17-21.hsd1.ms.comcast.net. [73.177.17.21]) by smtp.gmail.com with ESMTPSA id z21sm1237614oto.52.2020.02.26.14.23.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Feb 2020 14:23:32 -0800 (PST) From: George Hilliard To: Greg Kroah-Hartman Cc: George Hilliard , linux-serial@vger.kernel.org, devicetree@vger.kernel.org, NXP Linux Team , kernel@pengutronix.de Subject: [PATCH v4 0/2] Implement support for inverted serial TX/RX on i.MX Date: Wed, 26 Feb 2020 16:23:17 -0600 Message-Id: <20200226222319.18383-1-ghilliard@kopismobile.com> X-Mailer: git-send-email 2.25.0 MIME-Version: 1.0 Sender: linux-serial-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org This peripheral has dedicated control bits that flip input/output signals before handing them off to the OS. This is useful on my hardware because the UART is connected to an RS-422 transceiver with the +/- pins hooked up backward. Instead of a hack flipping all the bits before sending them, the hardware can do it for free. v4 cleans up the bit manipulation in v3; see previous series at https://lore.kernel.org/linux-serial/20200212163538.3006-1-ghilliard@kopismobile.com/ George Hilliard (2): dt-bindings: serial: document fsl,inverted-tx and -rx options tty: imx serial: Implement support for reversing TX and RX polarity .../bindings/serial/fsl-imx-uart.txt | 4 ++ drivers/tty/serial/imx.c | 44 ++++++++++++------- 2 files changed, 32 insertions(+), 16 deletions(-)