Help figuring out how to associate a device with GNSS subsystem (gnss_* modules)

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Hello,

I'm trying to figure out how to use the kernel's GNSS subsystem to create d=
evice nodes such as /dev/gnss0 on a conventional (non-embedded) system. Som=
e information from the author about the subsystem is at https://events19.li=
nuxfoundation.org/wp-content/uploads/2017/12/The-GNSS-Subsystem-Johan-Hovol=
d-Hovold-Consulting-AB.pdf#nameddest=3Dpage.17
GNSS receivers usually use a serial interface to send geolocation informati=
on to a host in a text format known informally as NMEA-0183. The hardware I=
 have is an Adafruit Ultimate GPS (MediaTek MT3333) with a bundled USB seri=
al converter (Silicon Labs CP2102N) so that the device can be plugged into =
a computer with USB. At=C2=A0https://cdn-shop.adafruit.com/product-files/10=
59/CD+PA1616D+Datasheet+v.05.pdf is a detailed description. I have been usi=
ng it without the GNSS subsystem, just accessing the TTY in user-space appl=
ications like gpsd and GeoClue. Enumerating serial devices is notoriously d=
ifficult in general, but I'm lucky that the serial converter has a manufact=
urer's serial number baked in so I can reliably detect device insertion wit=
h a udev rule like this:
	SUBSYSTEM=3D=3D"tty", ATTRS{idVendor}=3D=3D"10c4", ATTRS{idProduct}=3D=3D"=
ea60", ATTRS{serial}=3D=3D"0e30054dff9fec11a7ec8fcfa29c855c", ...

I can use such a udev rule to match the hardware or start a service if I wa=
nt, but without such a rule and out-of-the-box, the cp210x kernel driver ge=
ts loaded for this family of USB-serial converters, and the GNSS receiver i=
s accessible at /dev/ttyUSB0 for example. Then I can read from the device t=
o my heart's content.

What's confusing me, however, is how to tell the appropriate GNSS kernel mo=
dule(s) about this device so they can offer advanced features. (For example=
, some GNSS receivers such as MediaTek's allow changing the serial baud rat=
e on-the-fly using a special command. It's conceivable that a MediaTek GNSS=
 driver would take care of this negotiation if a user application does 'stt=
y 115200', say.) There are Devicetree properties recognized by the kernel f=
or setting up GNSS device nodes, but I'm using an ordinary x86_64 PC at the=
 moment which doesn't use Devicetree at all. The USB vendor/product ID is f=
or the generic serial converter, and I would like to use a udev rule or som=
ething similar with "smarts" to use my device's serial number for intellige=
nt identification.
There are a couple kernel modules to this subsystem:
 =E2=80=A2 gnss
 =E2=80=A2 gnss-mtk (depends on gnss-serial)
 =E2=80=A2 gnss-serial (depends on gnss)
 =E2=80=A2 gnss-usb (depends on gnss)

Technically gnss-mtk is the most specialized to my device; this is for Medi=
aTek receivers. I think gnss-usb is for a non-TTY-type device that sends an=
d receives the NMEA-0183 data from the USB endpoint descriptors directly, s=
o I *think* it's irrelevant for me. In particular, the cp210x driver does a=
 great job with the serial converter and exposing the USB serial converter =
as a TTY, so I guess gnss-mtk (and transitively gnss-serial) is supposed to=
 "wrap" around the TTY device. The USB device is probably useless without c=
p210x because otherwise there'd be no way to know how to talk to the conver=
ter.

There is a teeny bit of information at https://docs.kernel.org/admin-guide/=
abi-testing.html#abi-sys-class-gnss-gnss-n-type that shows sysfs nodes for =
devices should look like "/sys/class/gnss/gnss<N>". We shouldn't have to wo=
rry about setting the 'type' parameter described there because it's implici=
t in the use of gnss-mtk.

As suggested at https://lwn.net/Articles/143397/ my serial adapter gets exp=
osed as /dev/char/188:0, so I tried doing this:
# printf '188:0' > /sys/bus/serial/drivers/gnss-mtk/bind
but I get "No such device". Also, that LWN article is only using USB device=
s in its example and it's not obvious what syntax I would use for a serial =
device anyway. It also says that the device should not be bound to any driv=
er already, but we need gnss-mtk to "wrap" around the serial converter's ow=
n driver so this is very tricky... I also looked in /sys/class/gnss/ for cl=
ues but that directory is empty.
It looks like in drivers/gnss/core.c there is a gnss_allocate_device() func=
tion that creates device nodes and assigns them names.

In summary, how do I actually use this subsystem? Is Devicetree the only wa=
y to set this up?
Thanks

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