pub const BY_CLASS: u8 = 3;Expand description
hw-enumerator’s which-device question: [BY_CLASS, class (3 bytes LE), PREFER_OWN], answered
[bdf u32, class u32]. The supervisor asks it to choose a PCI driver’s device, which the kernel
then grants by that BDF; hardware asks it again to say which device that driver holds. One
definition, so the two cannot disagree. PREFER_OWN: the first device of the class that is not
a display’s companion function, if there is one (the T630’s HDMI audio, docs/audio.md).