From patchwork Sun Jun 7 16:23:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 11591749 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4DD1692A for ; Sun, 7 Jun 2020 16:24:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3682E2075A for ; Sun, 7 Jun 2020 16:24:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591547052; bh=KJ9kLBpb3xCN0JwgAo6sUdY3K2paSsW+KdYIQ5honpE=; h=From:To:Cc:Subject:Date:List-ID:From; b=ZB51R3HzknwBa34Wa9buQpxVIze6wdUxcxOv+WFeEQxSoDiUFW31Wlmt0SSUWtrUH js0/7Sn1g1zQY7LTOt8b9v2M6HeDwYhVr9AppQzvGZens1HWVm7NiYWfnk4stLgk6w /d/quCnIux1iSBPNmjtE9Wh7WkNcVVDGmqTeLcmA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726714AbgFGQYH (ORCPT ); Sun, 7 Jun 2020 12:24:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:49322 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726571AbgFGQYG (ORCPT ); Sun, 7 Jun 2020 12:24:06 -0400 Received: from localhost.localdomain (unknown [157.51.228.97]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 652162067B; Sun, 7 Jun 2020 16:24:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591547046; bh=KJ9kLBpb3xCN0JwgAo6sUdY3K2paSsW+KdYIQ5honpE=; h=From:To:Cc:Subject:Date:From; b=hQQT4kvmj50G3pgIrVf+1cu8EZsuIRHN7fIhOT4fIuRWZ5NklN1wc0CJkJZygWPhw pFogYuNWleyaut7uAO8hyExq/aGsbGkNJwJGhjWwdkU+M7nWDHNQujw8ECa4O8kbM9 9ylg6h9rq4qpVEurrhyn9hl5//y06A79KScMO69E= From: Manivannan Sadhasivam To: johan@kernel.org, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, patong.mxl@gmail.com, linus.walleij@linaro.org, mchehab+huawei@kernel.org, Manivannan Sadhasivam Subject: [RESEND PATCH v4 0/3] Add support for MaxLinear/Exar USB to serial converters Date: Sun, 7 Jun 2020 21:53:47 +0530 Message-Id: <20200607162350.21297-1-mani@kernel.org> X-Mailer: git-send-email 2.17.1 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hello, This series adds support for MaxLinear/Exar USB to serial converters. This driver only supports XR21V141X series but it can easily be extended to other series in future. This driver is inspired from the initial one submitted by Patong Yang: https://patchwork.kernel.org/patch/10543261/ While the initial driver was a custom tty USB driver exposing whole new serial interface ttyXRUSBn, this version is completely based on USB serial core thus exposing the interfaces as ttyUSBn. This will avoid the overhead of exposing a new USB serial interface which the userspace tools are unaware of. This series has been tested with Hikey970 board hosting XR21V141X chip. Thanks, Mani Changes in v4: * Multiple improvements based on Johan's review. Noticeable ones are: - Now the driver claims both control and data interfaces but only registers tty device for data interface. - GPIO pin status is now shared between the console and gpiolib implementations. This is done to avoid changing the lines spuriously. - A separate port_open flag is added to reject GPIO requests while the tty port is open. - Removed padding PID to gpio device. * Added Greg and Mauro's review and tested tags. * Included a patch from Mauro to avoid the CDC-ACM driver to claim this device when this driver is built. Changes in v3: * Dropped the check for PID and also the reg_width property. Changes in v2: * Dropped the code related to handling variable register size. It's all u8 now. * Dropped the header file and moved the contents to driver itself. * Added Linus's reviewed-by tag for gpiochip patch. * Added PID to gpiochip label * Dropped gpiochip for interface 0 Manivannan Sadhasivam (2): usb: serial: Add MaxLinear/Exar USB to Serial driver usb: serial: xr_serial: Add gpiochip support Mauro Carvalho Chehab (1): usb: cdc-acm: Ignore Exar XR21V141X when serial driver is built drivers/usb/class/cdc-acm.c | 6 + drivers/usb/serial/Kconfig | 9 + drivers/usb/serial/Makefile | 1 + drivers/usb/serial/xr_serial.c | 857 +++++++++++++++++++++++++++++++++ 4 files changed, 873 insertions(+) create mode 100644 drivers/usb/serial/xr_serial.c