Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756970AbaGDSNV (ORCPT ); Fri, 4 Jul 2014 14:13:21 -0400 Received: from mail.csclub.uwaterloo.ca ([129.97.134.52]:42812 "EHLO mail.csclub.uwaterloo.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752000AbaGDSNT (ORCPT ); Fri, 4 Jul 2014 14:13:19 -0400 From: "Lennart Sorensen" Date: Fri, 4 Jul 2014 14:13:17 -0400 To: Sebastian Andrzej Siewior Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Felipe Balbi Subject: Re: [RFC PATCH] tty: serial: Add 8250-core based omap driver Message-ID: <20140704181317.GE17769@csclub.uwaterloo.ca> References: <1404316809-20637-1-git-send-email-bigeasy@linutronix.de> <20140703184808.GD17769@csclub.uwaterloo.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140703184808.GD17769@csclub.uwaterloo.ca> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 03, 2014 at 02:48:08PM -0400, Lennart Sorensen wrote: > On Wed, Jul 02, 2014 at 06:00:09PM +0200, Sebastian Andrzej Siewior wrote: > > This patch provides a 8250-core based UART driver for the internal OMAP > > UART. The longterm goal is to provide the same functionality as the > > current OMAP uart driver and hopefully DMA support which could borrowed > > from the 8250-core. > > This sounds interesting. We are currently finding the omap serial driver > awefully slow at handling serial traffic with ti's 3.12.y kernel branch, > while the 3.8.y was seemingly a bit better (on the dra7xx eval board). > Haven't had time to really investigate that yet though. > > > The whole PM-Runtime part is currently missing. > > It has been only tested as console UART. > > The tty name is ttyS based instead of ttyO. How big is the pain here, > > what could be the easiest way to provide compatibility? > > I would certainly love to see ttyS instead of ttyO. But of course I am > working on a new system that isn't released yet so changing things is > a complete non issue for me. :) > > I should give this driver a try and see how it compares so far. I get a segfault at this line: mvr = uart_read(up, UART_OMAP_MVER); I added it to ti's 3.12.y kernel and ran it on uart7 and uart8 on a dra7xx-evm as a module (built in the kernel never booted due to the crash). -- Len Sorensen -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/