The wildcard should be narrowed down to prevent existing and future devices
that are not compatible from matching. It is very unlikely that incompatible
devices will be released that do not match the wildcard.

This is the documentation part of the commit.

Discussion Reference: https://lore.kernel.org/r/CAMuHMdVkwGjr6dJuMyhQNqFoJqbh6Ec5V2b5LenCshwpM2SDsQ@mail.gmail.comReported-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NThomas Kopp <thomas.kopp@microchip.com>
Link: https://lore.kernel.org/r/20200930091423.755-2-thomas.kopp@microchip.com
[mkl: rename file, too]
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>