Hi Bryan, On Wed, 15 Jan 2014, Bryan Wu wrote: > Hi Guennadi, > > I'm working on upstream our Tegra soc_camera host driver. But found > the soc_camera framework is not fully supporting Device Tree probing, > am I wrong about that? Mostly correct, yes, currently soc-camera doesn't support device-tree probing. > While in upstream Tegra kernel, we only support > DT probing and there is no board files. > > Current soc_camera framework needs to put soc_camera_link information > in a board file and build up soc-camera-pdrv platform_device, then > finally register this soc-camera-pdrv platform_device. > > For the host driver, we can do DT probing but for i2c soc_camera > sensor driver I failed to find any DT probing in upstream kernel. So > how to do that without an board file but use DT for this whole thing? > > Can we use DT like this? > DTB file will pass those I2C, clock, regulator, GPIO information to > host driver. During host driver DT probing, we dynamically create > soc-camera-pdrv platform_device and soc_camera_link then register > them. Then the rest of the thing should be the same as None-DT > probing. I've worked on soc-camera DT in the past, this might be the last published version http://marc.info/?l=linux-sh&m=134875489304837&w=1 As you see, it's quite old. Since then a few things happened. Device tree support has been added to V4L2 (see Documentation/devicetree/bindings/media/video-interfaces.txt and other files in that directory for examples), it is based on asynchronous probing, which is also supported by the soc-camera core and some its host drivers (e.g. commit 4dbfd040757b8bf22f4ac17e80b39c068061a16c Author: Guennadi Liakhovetski <g.liakhovetski@xxxxxx> Date: Tue Jul 30 02:59:49 2013 -0300 [media] V4L2: mx3_camera: add support for asynchronous subdevice registration ). So, what you should do, is add asynchronous probing support to your driver, add DT support to the soc-camera core, add it to your drivers. Also see drivers/media/v4l2-core/v4l2-of.c for helper functions, you should be using. Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
