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Patch 1 adds a small PROM21-specific xHCI PCI glue driver. USB host operation is delegated to common xhci-pci code; the PROM21 glue only owns the PCI binding and publishes an auxiliary "hwmon" child device for optional sensor support. The glue is built-in only when enabled, matching built-in xhci-pci, so PROM21 controllers are not left unbound during early boot if an optional module is absent. Patch 2 adds the auxiliary hwmon driver. It exposes temp1_input as prom21_xhci, does not wake the parent PCI device for sensor reads, and documents the register access and empirical observation method used to identify the register pair and conversion formula. Changes in v4: - Move PROM21 PCI handling into a PROM21-specific xHCI PCI glue driver. - Make USB_XHCI_PCI_PROM21 built-in only when enabled. - Rename the hwmon driver/config/name to prom21-xhci, SENSORS_PROM21_XHCI, and prom21_xhci. - Return -ENODATA for suspended parent devices and invalid raw values. - Remove temp1_label and the runtime PM module parameter. - Simplify hwmon remove/read lifetime handling. - Expand hwmon documentation with register access, runtime PM behavior, sysfs lookup, and observation details. Jihong Min (2): usb: xhci-pci: add AMD Promontory 21 PCI glue hwmon: add AMD Promontory 21 xHCI temperature sensor support Documentation/hwmon/index.rst | 1 + Documentation/hwmon/prom21-xhci.rst | 99 +++++++++++ drivers/hwmon/Kconfig | 10 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/prom21-xhci.c | 250 ++++++++++++++++++++++++++++ drivers/usb/host/Kconfig | 18 ++ drivers/usb/host/Makefile | 1 + drivers/usb/host/xhci-pci-prom21.c | 111 ++++++++++++ drivers/usb/host/xhci-pci.c | 11 ++ 9 files changed, 502 insertions(+) create mode 100644 Documentation/hwmon/prom21-xhci.rst create mode 100644 drivers/hwmon/prom21-xhci.c create mode 100644 drivers/usb/host/xhci-pci-prom21.c -- 2.53.0