It is difficult for a user to know which of the i2c adapters is for which drm connector. This series addresses this problem. The idea is to have a symbolic link in connector's sysfs directory, e.g.: ls -l /sys/class/drm/card0-HDMI-A-1/ddc lrwxrwxrwx 1 root root 0 Jun 24 10:42 /sys/class/drm/card0-HDMI-A-1/ddc \ -> ../../../../soc/13880000.i2c/i2c-2 The user then knows that their card0-HDMI-A-1 uses i2c-2 and can e.g. run ddcutil: ddcutil -b 2 getvcp 0x10 VCP code 0x10 (Brightness ): current value = 90, max value = 100 The first patch in the series adds struct i2c_adapter pointer to struct drm_connector. If the field is used by a particular driver, then an appropriate symbolic link is created by the generic code, which is also added by this patch. The second patch is an example of how to convert a driver to this new scheme. v1..v2: - used fixed name "ddc" for the symbolic link in order to make it easy for userspace to find the i2c adapter Andrzej Pietrasiewicz (2): drm: Include ddc adapter pointer in struct drm_connector drm/exynos: Provide ddc symlink in connector's sysfs drivers/gpu/drm/drm_sysfs.c | 7 +++++++ drivers/gpu/drm/exynos/exynos_hdmi.c | 11 +++++------ include/drm/drm_connector.h | 11 +++++++++++ 3 files changed, 23 insertions(+), 6 deletions(-) -- 2.17.1 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
