From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [PATCH 0/3] tty slave device support - version 3. Date: Fri, 20 Mar 2015 20:31:19 +0100 Message-ID: <20150320193119.GA28194@amd> References: <20150318055437.21025.13990.stgit@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20150318055437.21025.13990.stgit@notabene.brown> Sender: linux-kernel-owner@vger.kernel.org To: NeilBrown Cc: Mark Rutland , One Thousand Gnomes , Peter Hurley , Arnd Bergmann , Greg Kroah-Hartman , Sebastian Reichel , Grant Likely , Jiri Slaby , GTA04 owners , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org Hi! > here is version 3 of support for tty-slaves. > > This version introduces a new bus-type for tty-slaves, and causes > a tty-slave device to appear in /sys/devices between the uart and the > tty. > It effectively intercepts and calls from the tty to the uart (i.e. any > tty_operations) and applies extra functionality at that point. > > Currently the only driver intercepts open and close. > It powers on the device on open, and powers off at last-close. > > Power can be controlled by a regulator or by toggling a GPIO. > > I think I've incorporated most of the feed back I received from > previous versions, but if I missed something - I apologize. If > this approach is structurally acceptable then I can fix up all the > smaller issues. Do you have dts example? Anyway, we'll need something similar for bluetooth on N900. But we'd like the /dev/ttyXX not to be visible to the userspace in that case. Thanks, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html