From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: Re: [RFC][PATCH v3 1/3] runtime interpreted power sequences Date: Fri, 27 Jul 2012 11:19:23 -0700 Message-ID: <20120727181923.GB23564@kroah.com> References: <1343390750-3642-1-git-send-email-acourbot@nvidia.com> <1343390750-3642-2-git-send-email-acourbot@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: <1343390750-3642-2-git-send-email-acourbot-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" To: Alexandre Courbot Cc: linux-fbdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Mark Brown , Stephen Warren , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Rob Herring , linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org List-Id: linux-tegra@vger.kernel.org On Fri, Jul 27, 2012 at 09:05:48PM +0900, Alexandre Courbot wrote: > Some device drivers (panel backlights especially) need to follow precise > sequences for powering on and off, involving gpios, regulators, PWMs > with a precise powering order and delays to respect between each steps. > These sequences are board-specific, and do not belong to a particular > driver - therefore they have been performed by board-specific hook > functions to far. > > With the advent of the device tree and of ARM kernels that are not > board-tied, we cannot rely on these board-specific hooks anymore but > need a way to implement these sequences in a portable manner. This patch > introduces a simple interpreter that can execute such power sequences > encoded either as platform data or within the device tree. > > Signed-off-by: Alexandre Courbot > --- > Documentation/power/power_seq.txt | 120 +++++++++++++++ > drivers/base/Kconfig | 4 + > drivers/base/Makefile | 1 + > drivers/base/power_seq.c | 300 ++++++++++++++++++++++++++++++++++++++ > include/linux/power_seq.h | 139 ++++++++++++++++++ What's wrong with drivers/power/? I sure don't want to maintain this code, and it seems to not be part of the "driver core" infrastructure. thanks, greg k-h