From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sascha Hauer Subject: Re: [PATCH 3/7] DRM: add sdrm layer for general embedded system support Date: Fri, 20 Apr 2012 17:15:18 +0200 Message-ID: <20120420151518.GR3852@pengutronix.de> References: <1334158428-23735-1-git-send-email-s.hauer@pengutronix.de> <1334158428-23735-4-git-send-email-s.hauer@pengutronix.de> <20120420123842.GA25662@avionic-0098.adnet.avionic-design.de> <20120420142558.GB20681@sirena.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [92.198.50.35]) by gabe.freedesktop.org (Postfix) with ESMTP id EBB4A9E79D for ; Fri, 20 Apr 2012 08:15:26 -0700 (PDT) Content-Disposition: inline In-Reply-To: <20120420142558.GB20681@sirena.org.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Mark Brown Cc: kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org On Fri, Apr 20, 2012 at 03:25:58PM +0100, Mark Brown wrote: > On Fri, Apr 20, 2012 at 02:38:43PM +0200, Thierry Reding wrote: > > * Dave Airlie wrote: > > > I get the feeling the drm can just be a virtual platform device of > > > some sort, then it reads the device tree and binds all the information > > > on what crtc/encoders are available, > > > That's pretty much what I've come up with in the second round of Tegra DRM > > patches. Basically display controllers and outputs (RGB, HDMI, TVO, DSI) get > > separate drivers and register themselves with the DRM driver which then looks > > at the device tree to see which display controllers to register as CRTCs and > > parses a list of connector nodes to create encoder/connector pairs that > > define the physical connectors and their corresponding outputs. > > > I did take a brief look at the SDRM patches as well and they didn't quite > > seem to fit what was needed for Tegra. But if time allows I'll take a closer > > look. > > This sounds an awful lot like how ASoC hangs together... Very much, yes. In ASoC and DRM we both have several physical devices spread around the SoC which form a logical device. I assume that before ASoC existed also everyone had a single PCI device which could be used to collect the information together. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |