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'HDP' stands for Hardware Debug Port, it is an hardware block in STMicrolectronics' MPUs that let the user decide which internal SoC's signal to observe. It provides 8 ports and for each port there is up to 16 different signals that can be output. Signals are different for each MPU. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com> Link: https://lore.kernel.org/20250711-hdp-upstream-v7-1-faeecf7aaee1@foss.st.com [Fixed up Clement's new email address] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>