Hi all, I'm working on a way to annotate the location of a USB device within a system, specifically whether it's "user-facing" or "world-facing." There's precedent for this type of annotation: - ACPI: Uses the '_PLD' property for this purpose (https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/06_Device_Configuration/Device_Configuration.html#pld-physical-location-of-device). We already leverage this for MIPI camera sensors (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/media/pci/intel/ipu-bridge.c#n265). - Device Tree : Has a property for this within video-interface-devices.yaml (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/media/video-interface-devices.yaml#n386). I propose adding a similar property to usb-device.yaml (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/usb/usb-device.yaml). The ultimate goal is to have this information consumed by the video driver and exposed to userspace via the V4L2_CID_CAMERA_ORIENTATION control (https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/ext-ctrls-camera.html). What do you think about this? Thanks, -- Ricardo Ribalda
