On Sat, Oct 01, 2022 at 12:57:44AM +0530, Vidya Sagar wrote: > Provide a way for the firmware to tell the OS about the GPIO that can be > used to get the Hot-Plug and Unplug events. [...] > --- a/Documentation/devicetree/bindings/pci/pci.txt > +++ b/Documentation/devicetree/bindings/pci/pci.txt > @@ -32,6 +32,10 @@ driver implementation may support the following properties: > root port to downstream device and host bridge drivers can do programming > which depends on CLKREQ signal existence. For example, programming root port > not to advertise ASPM L1 Sub-States support if there is no CLKREQ signal. > +- hotplug-gpios: > + If present this property specifies the GPIO to be used for Hot-Plug/Unplug > + functionality. It is used by the PCIe GPIO Hot-Plug core driver for > + PCIe device Hot-Plug/Unplug events. Please specify the GPIO's semantics in more detail: Is the pin high as long as presence of a card is detected? Or does it pulse when a hotplug/unplug event occurs? Thanks, Lukas
