Re: No PNP0CA0 device on a Dell Precision 5520 laptop

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Tue, Feb 11, 2020 at 03:34:37PM +0100, Oliver Neukum wrote:
> 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.

OK, cool! Let me know if the tps6598x.c driver works with that.

thanks,

-- 
heikki