Kernel source vim/cscope mapping setup

Hello all,
not sure if this is the right place to post, here it goes anyway. I’m using R32.2.3 and usually develop video drivers. I configured vim for kernel development, however I’m having problems with the right cscope indexing. The file structure is as follows (it is the default setup default if I recall correctly):

tree within ~/TX2_workdir/R32_2_3/kernel_src

kernel_src
  |-hardware
  |
  |-nvidia (a bunch of dts dirs in here)
  |
  |-kernel
      |-kernel-4.9
      |
      |-nvgpu
      |
      |-nvidia

Automatic indexing, by means of tags.sh (make O=. ARCH=arm SUBARCH=armv8 COMPILED_SOURCE=1 cscope tags) from withing kernel-4.9 directory, provides with mapping that works within that directory only. As I try to edit video drivers within nvidia/drivers/media/i2c/ no cscope linkage is avaliable.

From what I understand, I have to do manual indexing as shown in cscope manual (http://cscope.sourceforge.net/cscope_vim_tutorial.html), however I’m not sure which files to include. Does anyone have any pointers regarding cscope?

Best regards,
Jarek

OK, the solution is simple:
opening a desired file (i.e. $SRC_DIR/kernel/nvidia/drivers/media/i2c/mydriver.c) from a directory containing the cscope.out file ($SRC_DIR/kernel/kernel-4.9) seems to work.

Best regards,
Jarek