On Thu, 18 Oct 2018 at 21:07, Christian Gmeiner <christian.gmeiner@xxxxxxxxx> wrote: > > Since kernel 4.17 (drm/etnaviv: remove the need for a gpu-subsystem DT > node) the etnaviv DRM driver doesn't have an associated DT node > anymore. This is technically correct, as the etnaviv device is a > virtual device driving multiple hardware devices. > > Before 4.17 the userspace had access to the following information: > # cat /sys/dev/char/226:128/device/uevent > DRIVER=etnaviv > OF_NAME=gpu-subsystem > OF_FULLNAME=/gpu-subsystem > OF_COMPATIBLE_0=fsl,imx-gpu-subsystem > OF_COMPATIBLE_N=1 > MODALIAS=of:Ngpu-subsystemT<NULL>Cfsl,imx-gpu-subsystem > DRIVER=imx-drm > OF_NAME=display-subsystem > OF_FULLNAME=/display-subsystem > OF_COMPATIBLE_0=fsl,imx-display-subsystem > OF_COMPATIBLE_N=1 > > Afer 4.17: > # cat /sys/dev/char/226:128/device/uevent > DRIVER=etnaviv > MODALIAS=platform:etnaviv > Mostly relaying what I mentioned previously [1], yet forgot to CC RobH. - Are the OF entries in uevent part of the ABI or not? Can we have that documented anywhere? There are very few mentions in the official kernel doc - Documentation/ABI/ Obviously it doesn't mention anything OF_* but it neither does DRIVER or MODALIAS. Yet if we change those $world will break ;-) - How can we distinguish in the (perhaps hypothetical) case when there's two or more etnaviv devices? Thanks Emil [1] https://lists.freedesktop.org/archives/mesa-dev/2018-September/205660.html _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
