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Document the stm32 debug bus. The debug bus is responsible for checking the debug sub-system accessibility before probing any related drivers. Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Link: https://lore.kernel.org/r/20260226-debug_bus-v6-3-5d794697798d@foss.st.com Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>