From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Tue, 27 Sep 2016 20:52:53 +0200 (CEST) Received: from localhost.localdomain ([127.0.0.1]:34740 "EHLO linux-mips.org" rhost-flags-OK-OK-OK-FAIL) by eddie.linux-mips.org with ESMTP id S23990517AbcI0SwqRGf2m (ORCPT ); Tue, 27 Sep 2016 20:52:46 +0200 Received: from scotty.linux-mips.net (localhost.localdomain [127.0.0.1]) by scotty.linux-mips.net (8.15.2/8.14.8) with ESMTP id u8RIqesc016782; Tue, 27 Sep 2016 20:52:40 +0200 Received: (from ralf@localhost) by scotty.linux-mips.net (8.15.2/8.15.2/Submit) id u8RIqbuo016781; Tue, 27 Sep 2016 20:52:37 +0200 Date: Tue, 27 Sep 2016 20:52:37 +0200 From: Ralf Baechle To: Paul Burton Cc: linux-mips@linux-mips.org, Mauro Carvalho Chehab , Miguel Ojeda Sandonis , linux-kernel@vger.kernel.org, Guenter Roeck , "David S. Miller" , Greg Kroah-Hartman , Geert Uytterhoeven , Andrew Morton Subject: Re: [PATCH v2 17/19] auxdisplay: img-ascii-lcd: driver for simple ASCII LCD displays Message-ID: <20160927185237.GG12981@linux-mips.org> References: <20160826141751.13121-1-paul.burton@imgtec.com> <20160826141751.13121-18-paul.burton@imgtec.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160826141751.13121-18-paul.burton@imgtec.com> User-Agent: Mutt/1.7.0 (2016-08-17) Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 55270 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk List-help: List-unsubscribe: List-software: Ecartis version 1.0.0 List-Id: linux-mips X-List-ID: linux-mips List-subscribe: List-owner: List-post: List-archive: X-list: linux-mips On Fri, Aug 26, 2016 at 03:17:49PM +0100, Paul Burton wrote: > Add a driver for simple ASCII LCD displays found on the MIPS Boston, > Malta & SEAD3 development boards. The Boston display is an independent > memory mapped device with a simple memory mapped 8 byte register space > containing the 8 ASCII characters to display. The Malta display is > exposed as part of the Malta board registers, and provides 8 registers > each of which corresponds to one of the ASCII characters to display. The > SEAD3 display is slightly more complex, exposing an interface to an > S6A0069 LCD controller via registers provided by the boards CPLD. > However although the displays differ in their register interface, we > require similar functionality on each board so abstracting away the > differences within a single driver allows us to share a significant > amount of code & ensure consistent behaviour. > > The driver displays the Linux kernel version as the default message, but > allows the message to be changed via a character device. Messages longer > then the number of characters that the display can show will scroll. > > This provides different behaviour to the existing LCD display code for > the MIPS Malta or MIPS SEAD3 platforms in the following ways: > > - The default string to display is not "LINUX ON MALTA" or "LINUX ON > SEAD3" but "Linux" followed by the version number of the kernel > (UTS_RELEASE). > > - Since that string tends to be significantly longer it scrolls twice > as fast, moving every 500ms rather than every 1s. > > - The LCD won't be updated until the driver is probed, so it doesn't > provide the early "LINUX" string. Right now parts 15..18 of this series are stalled due to the lack of an ack for this patch. Miguel? Ralf