From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Date: Fri, 05 Oct 2012 18:45:14 +0000 Subject: Re: [PATCH 05/14] media: add a V4L2 OF parser Message-Id: <20121005184514.GF4360@opensource.wolfsonmicro.com> List-Id: References: <1348754853-28619-1-git-send-email-g.liakhovetski@gmx.de> <506ABE40.9070504@samsung.com> <201210051241.52205.hverkuil@xs4all.nl> <506F2763.6050808@gmail.com> In-Reply-To: <506F2763.6050808@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Sylwester Nawrocki Cc: Guennadi Liakhovetski , Hans Verkuil , Sylwester Nawrocki , linux-media@vger.kernel.org, devicetree-discuss@lists.ozlabs.org, Laurent Pinchart , Magnus Damm , linux-sh@vger.kernel.org, Stephen Warren , Arnd Bergmann , Grant Likely On Fri, Oct 05, 2012 at 08:30:59PM +0200, Sylwester Nawrocki wrote: > The deferred probing was introduced in Linux to resolve resource > inter-dependencies in case of FDT based booting AFAIK. It's completely unrelated to FDT, it's a general issue. There's no sane way to use hacks like link ordering to resolve boot time dependencies - start getting things like regulators connected to I2C or SPI controllers which may also use GPIOs for some signals and may be parents for other regulators and mapping out the dependency graph becomes unreasonably complicated. Deferred probing is designed to solve this problem by working things out dynamically at runtime. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: [PATCH 05/14] media: add a V4L2 OF parser Date: Fri, 5 Oct 2012 19:45:14 +0100 Message-ID: <20121005184514.GF4360@opensource.wolfsonmicro.com> References: <1348754853-28619-1-git-send-email-g.liakhovetski@gmx.de> <506ABE40.9070504@samsung.com> <201210051241.52205.hverkuil@xs4all.nl> <506F2763.6050808@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <506F2763.6050808@gmail.com> Sender: linux-media-owner@vger.kernel.org To: Sylwester Nawrocki Cc: Guennadi Liakhovetski , Hans Verkuil , Sylwester Nawrocki , linux-media@vger.kernel.org, devicetree-discuss@lists.ozlabs.org, Laurent Pinchart , Magnus Damm , linux-sh@vger.kernel.org, Stephen Warren , Arnd Bergmann , Grant Likely List-Id: devicetree@vger.kernel.org On Fri, Oct 05, 2012 at 08:30:59PM +0200, Sylwester Nawrocki wrote: > The deferred probing was introduced in Linux to resolve resource > inter-dependencies in case of FDT based booting AFAIK. It's completely unrelated to FDT, it's a general issue. There's no sane way to use hacks like link ordering to resolve boot time dependencies - start getting things like regulators connected to I2C or SPI controllers which may also use GPIOs for some signals and may be parents for other regulators and mapping out the dependency graph becomes unreasonably complicated. Deferred probing is designed to solve this problem by working things out dynamically at runtime.