From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: [PATCH v2] TTY: serial, add pm function Date: Thu, 17 Jan 2013 13:16:14 +0000 Message-ID: <20130117131614.30b9089e@bob.linux.org.uk> References: <1355316051-2425-1-git-send-email-rickard.andersson@stericsson.com> <20130116070521.GB2527@kroah.com> <50F65C5E.9090804@stericsson.com> <20130116075813.GA30819@kroah.com> <50F665C5.9020603@stericsson.com> <20130116152440.GA1101@kroah.com> <20130117023214.GB20928@kroah.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from mga03.intel.com ([143.182.124.21]:2622 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752388Ab3AQM4L (ORCPT ); Thu, 17 Jan 2013 07:56:11 -0500 In-Reply-To: <20130117023214.GB20928@kroah.com> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Greg KH Cc: Linus Walleij , Rickard Andersson , "linux-serial@vger.kernel.org" , Linus WALLEIJ , "daniel.lezcano@linaro.org" > Also, why does this driver need something that the hundreds of other > serial drivers we have in-kernel today do not? What makes it special > over everything else? We certainly will need power management hooks on the tty layer - probably they belong on the tty_port operations. Several things have happened that make it more relevant - power levels have come down to the point that serial ports are no longer off the radar - quite a few embedded and tablet devices have internal serial busses where turning off ports and stuff behind them matters. Alan