Re: No PNP0CA0 device on a Dell Precision 5520 laptop

[Oliver Neukum <oneukum@suse.de>]

Am Dienstag, den 11.02.2020, 16:28 +0200 schrieb Heikki Krogerus:
> On Tue, Feb 11, 2020 at 03:14:10PM +0100, Oliver Neukum wrote:
> > Am Dienstag, den 11.02.2020, 15:59 +0200 schrieb Heikki Krogerus:
> > > cat /sys/bus/acpi/devices/USBC000\:00/status
> > 
> > Technically -ENODEV. It does not exist, even in a listing.
> > But this thing definitely has a type C port. It is connected
> > to a docking station which supplies the whole system with power.
> > Ethernet also works.
> 
> There is still no requirement for the BIOS or the EC firmware to
> expose UCSI to the operating system. If the ACPI node is not there,
> then there is no UCSI on that system. The USB Type-C connectors
> function autonomously in any case on a system that exposes them to the
> operating system with UCSI. UCSI is more like an optional status
> interface that allows limited control over some specific things like
> role swapping.
> 
> UCSI is usually supported when the USB Power Delivery (USB PD)
> controllers are connected to the Embedded Controller on the system,
> but on some of our platforms they are directly connected to the SOC
> instead. So on those platforms we can directly communicate with the
> USB PD controller from the operating system, which is actually much
> better situation compared to UCSI IMO.
> 
> Do you have this ACPI node: INT3515 ?
> 
> It's for the TI TPS6598x USB PD controllers.

Hi,

yes I got that one. Thanks for the tip.

	Regards
		Oliver