From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter De Schrijver Subject: Re: [PATCH 6/9] ARM: tegra: Export tegra_powergate_power_on Date: Wed, 9 Jul 2014 15:43:44 +0300 Message-ID: <20140709124344.GK23218@tbergstrom-lnx.Nvidia.com> References: <20140619080234.GK3407@tbergstrom-lnx.Nvidia.com> <53A3096B.1040409@wwwdotorg.org> <20140623101441.GU3407@tbergstrom-lnx.Nvidia.com> <20140708130501.GC9516@ulmo> <20140708141135.GC23218@tbergstrom-lnx.Nvidia.com> <20140709063130.GA3170@ulmo> <20140709083311.GE23218@tbergstrom-lnx.Nvidia.com> <20140709102551.GA19357@ulmo> <20140709110816.GF23218@tbergstrom-lnx.Nvidia.com> <20140709120400.GA3819@ulmo> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Return-path: Content-Disposition: inline In-Reply-To: <20140709120400.GA3819@ulmo> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Thierry Reding Cc: Stephen Warren , Mikko Perttunen , "tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org" , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-ide-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-tegra@vger.kernel.org On Wed, Jul 09, 2014 at 02:04:02PM +0200, Thierry Reding wrote: > > For those 2 domains we can find the necessary clocks and resets by parsing > > the relevant existing DT nodes for PCIe and gr3d. For clocks, this isn't > > even needed as we can always register some extra clkdev's to get them. There > > is no equivalent for resets so we have to parse the gr3d and pcie DT nodes, > > but that's not too bad I think. > > Even if we could really do this, at this point I don't see an advantage. > All that it would be doing is move to some subsystem that doesn't quite > match what we need just for the sake of moving to that subsystem. Having > a Tegra-specific API doesn't sound so bad anymore. > The advantage would be that we can use LP0/SC7 as a cpuidle state. Also system resume from LP0 can be faster as we potentially don't have to resume all domains at once. Cheers, Peter.