On Thu, Oct 24, 2013 at 11:00:56AM +0200, Thierry Reding wrote: > On Thu, Oct 24, 2013 at 09:28:11AM +0200, Sascha Hauer wrote: > > On Wed, Oct 23, 2013 at 09:14:17PM -0400, Rob Clark wrote: > > > On Mon, Oct 21, 2013 at 5:27 AM, Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> wrote: > > > >> If a subsystem doesn't work well with DT, then the choices are either: > > > >> > > > >> (a) don't use DT with the subsystem > > > > > > > > The underlying problem has nothing to do with DT. Multi component > > > > hardware does exist and won't vanish when we stop using DT. > > > > > > > >> (b) fix the subsystem > > > > > > > > I'd love to do that. Step one to this seems to be to increase the > > > > awareness that there's something wrong with DRM. > > > > > > > > > Note that I suspect your idea of "fixing drm" is going to break some > > > userspace assumptions about the hw (ie. userspace isn't expecting > > > crtcs/encoders/connectors to suddenly appear/disappear. And the funny > > > thing is, on all of this hw, that isn't going to happen anyways. > > > > I was talking about all SoC DRM drivers implementing variants of the > > same glue between drm and the multidevice nature of the components. > > > > To make that sure: I never had the intention to implement hotplug for > > drm. Also what the imx-drm driver does is not for hotplug, but only for > > binding different components together. > > I think we should be able to solve that problem generically. Essentially > we need some sort of composite device that subdevices can register with. > The composite device can keep track of what devices are needed (this > works well by walking the device tree, looking for nodes that match by > compatible and see if their status property is set to"okay") and once > all of those have been registered do whatever the specific subsystem > requires. It would be great to have a generic approach to this since subsystems like ASoC and v4l2 have the same problem. 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 | -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
