Which branch for a new device?

Sorry, I am lost.

pippo@wd:~/GHubWRT/openwrt$ make dirclean
WARNING: Makefile 'package/utils/busybox/Makefile' has a dependency on 'libpam', which does not exist
WARNING: Makefile 'package/utils/busybox/Makefile' has a dependency on 'libpam', which does not exist
WARNING: Makefile 'package/utils/busybox/Makefile' has a build dependency on 'libpam', which does not exist
WARNING: Makefile 'package/boot/kexec-tools/Makefile' has a dependency on 'liblzma', which does not exist
WARNING: Makefile 'package/network/services/lldpd/Makefile' has a dependency on 'libnetsnmp', which does not exist
WARNING: Makefile 'package/utils/policycoreutils/Makefile' has a dependency on 'libpam', which does not exist
WARNING: Makefile 'package/utils/policycoreutils/Makefile' has a dependency on 'libpam', which does not exist
WARNING: Makefile 'package/utils/policycoreutils/Makefile' has a build dependency on 'libpam', which does not exist
 make[1] dirclean
pippo@wd:~/GHubWRT/openwrt$ git log --oneline -n 8
b3f4197139 (HEAD -> wlr4100v1002, origin/master, origin/HEAD, master) mtd: fix imagetag compilation
e1b4fd52a8 bcm4908: backport recent bcm_sf2 changes
7091e31230 bcm4908: backport recent bcm4908_enet changes
0f7cd97f81 build,ib: add STRIP_ABI option for manifest
dbde2bcf60 mbedtls: update to 2.16.10
34f898ec29 bmips: backport bcm6368-mdio-mux support
7ec9d95567 bmips: enable CONFIG_B53_MDIO_DRIVER
b434c524b1 bmips: backport b53 spi device tree patch
pippo@wd:~/GHubWRT/openwrt$ git fetch upstream
remote: Enumerating objects: 232, done.
remote: Counting objects: 100% (232/232), done.
remote: Compressing objects: 100% (23/23), done.
remote: Total 336 (delta 212), reused 225 (delta 209), pack-reused 104
Receiving objects: 100% (336/336), 133.87 KiB | 3.19 MiB/s, done.
Resolving deltas: 100% (236/236), completed with 129 local objects.
From https://github.com/openwrt/openwrt
   a50441b6e9..bc356de285  master        -> upstream/master
   afdd5dcd0d..dce6b118eb  openwrt-19.07 -> upstream/openwrt-19.07
   192486ac74..cd48473bb8  openwrt-21.02 -> upstream/openwrt-21.02
pippo@wd:~/GHubWRT/openwrt$ git merge upstream
merge: upstream - not something we can merge
pippo@wd:~/GHubWRT/openwrt$ git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.

    git pull <remote> <branch>

If you wish to set tracking information for this branch you can do so with:

    git branch --set-upstream-to=<remote>/<branch> wlr4100v1002

pippo@wd:~/GHubWRT/openwrt$ git branch
  master
* wlr4100v1002
pippo@wd:~/GHubWRT/openwrt$ git remote -v
origin	https://github.com/polex/openwrt.git (fetch)
origin	https://github.com/polex/openwrt.git (push)
upstream	https://github.com/openwrt/openwrt.git (fetch)
upstream	https://github.com/openwrt/openwrt.git (push)
pippo@wd:~/GHubWRT/openwrt$ git pull openwrt wlr4100v1002
fatal: 'openwrt' does not appear to be a git repository
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
pippo@wd:~/GHubWRT/openwrt$ git log --oneline -n 8
b3f4197139 (HEAD -> wlr4100v1002, origin/master, origin/HEAD, master) mtd: fix imagetag compilation
e1b4fd52a8 bcm4908: backport recent bcm_sf2 changes
7091e31230 bcm4908: backport recent bcm4908_enet changes
0f7cd97f81 build,ib: add STRIP_ABI option for manifest
dbde2bcf60 mbedtls: update to 2.16.10
34f898ec29 bmips: backport bcm6368-mdio-mux support
7ec9d95567 bmips: enable CONFIG_B53_MDIO_DRIVER
b434c524b1 bmips: backport b53 spi device tree patch
pippo@wd:~/GHubWRT/openwrt$ 

I agree, Could you suggest me the sequence of commands to issue?