[PATCH RFC 26/46] drivers/base: provide an infrastructure for componentised subsystems (original) (raw)
Jean-Francois Moine moinejf at free.fr
Fri Feb 7 03:57:21 PST 2014
- Previous message: [PATCH v4 00/34] drm/exynos: Refactor parts of the exynos driver
- Next message: [PATCH RFC 26/46] drivers/base: provide an infrastructure for componentised subsystems
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
On Fri, 7 Feb 2014 09:46:56 +0000 Russell King - ARM Linux <linux at arm.linux.org.uk> wrote:
On Fri, Feb 07, 2014 at 10:04:30AM +0100, Daniel Vetter wrote: > I've chatted a bit with Hans Verkuil about this topic at fosdem and > apparently both v4l and alsa have something like this already in their > helper libraries. Adding more people as fyi in case they want to > switch to the new driver core stuff from Russell.
It's not ALSA, but ASoC which has this. Mark is already aware of this and will be looking at it from an ASoC perspective.
Russell,
I started to use your code (which works fine, thanks), and it avoids a lot of problems, especially, about probe_defer in a DT context.
I was wondering if your componentised mechanism could be extended to the devices defined by DT.
In the DT, when a device_node is a phandle, this means it is referenced by some other device(s), and these device(s) will not start until the phandle device is registered.
Then, the idea is to do a component_add() for such phandle devices in device_add() (device_register).
Pratically,
the component_add() call in device_register would not include any bind/unbind callback function, so, this should be tested in component_bind/unbind(),
component_add would not be called if the device being added already called component_add in its probe function. A simple flag in the struct device_node should solve this problem.
What do you think about this?
-- Ken ar c'hentañ | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/
- Previous message: [PATCH v4 00/34] drm/exynos: Refactor parts of the exynos driver
- Next message: [PATCH RFC 26/46] drivers/base: provide an infrastructure for componentised subsystems
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]