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GPL does not mandate upstreaming your drivers.

• adastra22 11mo ago
  It mandates making source available for upstreaming, if you are distributing.
  • bmacho 11mo ago
    That's actually true, if they wanted to distribute a linux compatible driver they had to make it available for anyone to upstream it in the linux kernel. Probably GPL was indeed a factor that made device makers and hackers to create open source drivers for linux. I am not convinced that it was a major one.