STMicroelectronics STM32 Hardware Debug Port (HDP) pin control

modulename: pinctrl-stm32-hdp.ko

configname: CONFIG_PINCTRL_STM32_HDP

Linux Kernel Configuration
└─>Device Drivers
└─>Pin controllers
└─>Device Tree and Open Firmware support
└─>STMicroelectronics STM32 Hardware Debug Port (HDP) pin control
In linux kernel since version 6.17 (release Date: 2025-09-28)  
The Hardware Debug Port allows the observation of internal signals.
It uses configurable multiplexer to route signals in a dedicated observation register.
This driver also permits the observation of signals on external SoC pins.
It permits the observation of up to 16 signals per HDP line.

source code: