Re: [PATCH v7 1/2] usb: xhci-pci: add AMD Promontory 21 PCI glue

[Guenter Roeck]

On Tue, May 19, 2026 at 09:07:31AM +0900, Jihong Min wrote:
> 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@xxxxxxxxx>
> Reviewed-by: Mario Limonciello (AMD) <superm1@xxxxxxxxxx>
> Tested-by: Yaroslav Isakov <yaroslav.isakov@xxxxxxxxx>

Acked-by: Guenter Roeck <linux@xxxxxxxxxxxx>

The two patches should be applied together. For now I will assume that
they will both be applied through a usb tree since this patch touches
common usb code.

Thanks,
Guenter