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AMD Promontory 21 (PROM21) xHCI PCI functions use the common xhci-pci core for USB operation, but also expose controller-specific sensor data. Add a small PROM21 PCI glue driver for AMD 1022:43fc and 1022:43fd controllers. The glue delegates USB host operation to the common xhci-pci core and publishes a "hwmon" auxiliary device with parent-provided MMIO data. Auxiliary device creation failure is logged but does not fail the xHCI probe. Make the PROM21 glue a hidden Kconfig tristate driven by the user-visible SENSORS_PROM21_XHCI option. If sensor support is disabled, generic xhci-pci binds PROM21 controllers normally. If sensor support is enabled, the glue follows USB_XHCI_PCI. This keeps the auxiliary device available for a modular sensor driver while avoiding a built-in xhci-pci core handing PROM21 controllers to a glue driver that is only available as a module during initramfs. Assisted-by: Codex:gpt-5.5 Signed-off-by: Jihong Min <hurryman2212@gmail.com> Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org> Tested-by: Yaroslav Isakov <yaroslav.isakov@gmail.com> Acked-by: Guenter Roeck <linux@roeck-us.net> Link: https://patch.msgid.link/20260519000732.2334711-2-hurryman2212@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>