linux-kernel - Re: [PATCH v4 0/4] Bluetooth/gnss: GNSS support for TiWi chips

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Date: Sat, 8 Jun 2024 14:00:38 -0500
From: Adam Ford <aford173@...il.com>
To: Andreas Kemnade <andreas@...nade.info>
Cc: Luiz Augusto von Dentz <luiz.dentz@...il.com>, marcel@...tmann.org, johan@...nel.org, 
	pmenzel@...gen.mpg.de, jirislaby@...nel.org, gregkh@...uxfoundation.org, 
	linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org, 
	Tony Lindgren <tony@...mide.com>, tomi.valkeinen@...asonboard.com, 
	Péter Ujfalusi <peter.ujfalusi@...il.com>, robh@...nel.org, 
	hns@...delico.com
Subject: Re: [PATCH v4 0/4] Bluetooth/gnss: GNSS support for TiWi chips

On Thu, Jun 6, 2024 at 3:19 PM Andreas Kemnade <andreas@...nade.info> wrote:
>
> Hi Luiz,
>
> On Thu, 6 Jun 2024 16:04:10 -0400
> Luiz Augusto von Dentz <luiz.dentz@...il.com> wrote:
>
> > Hi Andreas,
> >
> > On Thu, Jun 6, 2024 at 2:30 PM Andreas Kemnade <andreas@...nade.info> wrote:
> > >
> > > Some of these chips have GNSS support. In some vendor kernels
> > > a driver on top of misc/ti-st can be found providing a /dev/tigps
> > > device which speaks the secretive Air Independent Interface (AI2) protocol.

I think you may have sent me a file to test, but I can't find the
e-mail.   Can you tell me what tool you used to test it?  I can get
gnss0 to enumerate, so I am close.

[   20.759857] hci-ti serial0-0: using DT
'/ocp@...00000/serial@...6c000/bluetooth-gnss' for 'enable' GPIO
lookup
[   20.770263] of_get_named_gpiod_flags: parsed 'enable-gpios'
property of node '/ocp@...00000/serial@...6c000/bluetooth-gnss[0]' -
status (0)
[   29.221588] gnss: GNSS driver registered with major 244


adam

> > >
> > > To be more compatible with userspace send out NMEA by default but
> > > allow a more raw mode by using a module parameter.
> > >
> > > This was tested on the Epson Moverio BT-200.
> > >
> > > Who will take this series (1-3)? GNSS with ack from Bluetooth?
> > >
> > > Changes since V3:
> > > - Finally remove the period from 1/4 subject
> > > - include things directly for get_unaligned_le16() to fix 0-day issues
> > >
> > > Changes since V2:
> > > - Optimize waits
> > > - Fix some packet analysis / checksum computation issue
> > > - Adding a proposal for removing those waits as RFC
> > > - Minor spell corrections and improved descriptions
> > >
> > > Changes since V1:
> > > - Set up things for NMEA output
> > > - Powerup/down at open()/close()
> > > - split out logic between drivers/bluetooth and drivers/gnss
> > > - leave out drivers/misc/ti-st driver removal to avoid
> > >   filling up mailboxes during the iterations, this series is
> > >   still a proof that it is not needed, will take the brush after
> > >   this series is accepted.
> > >
> > >
> > > Andreas Kemnade (4):
> > >   gnss: Add AI2 protocol used by some TI combo chips
> > >   Bluetooth: ti-st: Add GNSS subdevice for TI Wilink chips
> >
> > The bluetooth one looks relatively simple so I could take that one and
> > push to bluetooth-next if there are no dependencies on the other
> > changes.
> >
> There is:
>
> include/linux/ti_wilink_st.h |   8 +
>
> We have compile time deps here. Patch 3 compile time depends on patch 2. If we
> cannot take everything in for  6.11, you might opt to take the bluetooth part.
> That would work.
>
> Regards,
> Andreas