From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Guo Subject: Re: [PATCH V4 0/9] Add mandatory regulator for all users of pwm-backlight. Date: Wed, 20 Mar 2013 11:08:09 +0800 Message-ID: <20130320030806.GA26941@S2101-09.ap.freescale.net> References: <1363719573-20926-1-git-send-email-achew@nvidia.com> <20130320021442.GB20443@S2101-09.ap.freescale.net> <51491DF0.10408@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <51491DF0.10408@nvidia.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Alex Courbot Cc: "drwyrm@gmail.com" , "stefan@openezx.org" , "linux-samsung-soc@vger.kernel.org" , "openezx-devel@lists.openezx.org" , "linux@arm.linux.org.uk" , "romain.naour@openwide.fr" , "swarren@wwwdotorg.org" , "thierry.reding@avionic-design.de" , "haojian.zhuang@gmail.com" , Andrew Chew , "marek.vasut@gmail.com" , "kyungmin.park@samsung.com" , "kgene.kim@samsung.com" , "linux-arm-kernel@lists.infradead.org" , "philipp.zabel@gmail.com" , "lost.distance@yahoo.com" li List-Id: linux-tegra@vger.kernel.org On Wed, Mar 20, 2013 at 11:24:48AM +0900, Alex Courbot wrote: > On 03/20/2013 11:14 AM, Shawn Guo wrote: > >On Tue, Mar 19, 2013 at 11:59:24AM -0700, Andrew Chew wrote: > >>Many backlights are enabled via GPIO. We can generalize the GPIO to a > >>fixed regulator. > >> > >I think we should push the series of "Runtime Interpreted Power > >Sequences" moving forward, which should be useful this case and many > >other cases as well. > > > >http://thread.gmane.org/gmane.linux.kernel/1395912 > > That's still the medium-term plan. But doing this correctly requires > some improvements to be done in the GPIO subsystem, which I am > pushing at the moment. > Thanks for updating the status. > Eventually power sequences should handle this kind of scenario, but > by the meantime it cannot hurt to get the job done. > It just makes us a little sick that a dummy fixed regulator is added all over the places merely for pwm-backlight to retrieve a GPIO from device tree. Shawn