linux-kernel - Re: [PATCH v2 2/4] dt-bindings: gnss: add mediatek binding

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Date:   Fri, 15 Feb 2019 13:10:35 +0100
From:   Loys Ollivier <lollivier@...libre.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Loys Ollivier <lollivier@...libre.com>,
        "open list\:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, Kevin Hilman <khilman@...libre.com>,
        "open list\:ARM\/Amlogic Meson..." 
        <linux-amlogic@...ts.infradead.org>,
        "moderated list\:ARM\/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH v2 2/4] dt-bindings: gnss: add mediatek binding


On Thu 14 Feb 2019 at 09:11, Johan Hovold <johan@...nel.org> wrote:

> On Wed, Feb 13, 2019 at 04:24:00PM +0100, Loys Ollivier wrote:
>> On Mon 11 Feb 2019 at 14:17, Loys Ollivier <lollivier@...libre.com> wrote:
>> > On Mon 11 Feb 2019 at 08:33, Johan Hovold <johan@...nel.org> wrote:
>
>> >> Right, but please do look around for other receivers using this chipset
>> >> so that we can make the binding generic enough to cover those as well
>> >> (e.g. by choosing representative resource names).
>> >>
>> > OK will have a look.
>> 
>> The only mt3339-based receivers I have found are:
>> - [0] Globaltop
>> - [1] Locosys / Pololu
>> They both only provide the UART interface and do not list the I2C/SPI
>> interfaces.
>> 
>> [0] https://cdn-shop.adafruit.com/datasheets/GlobalTop-FGPMMOPA6H-Datasheet-V0A.pdf
>> [1] https://www.pololu.com/file/0J641/LS20030~3_datasheet_v1.3.pdf
>
> I found tree more:
>
Ah nice.

>  - Globaltop PA6C
>
>    - https://cdn-shop.adafruit.com/datasheets/GlobalTop-FGPMMOPA6C-Datasheet-V0A-Preliminary.pdf
>
>  - Linx RM series
>    - https://linxtechnologies.com/wp/wp-content/uploads/rxm-gps-rm.pdf

This is a different chip: MT3337; Apparently this chip only provides an
UART interface: https://labs.mediatek.com/en/chipset/MT3337
However it looks interesting. I'll look for a sample to test it in the
future :)
>
>  - ublox IT530
>    - https://www.u-blox.com/sites/default/files/products/documents/IT530_DataSheet_%28FTX-HW-12008%29.pdf
>
> All with uart-interface only and similar pins names, although the ublox
> device do have some additional features we can worry about later.
>
> As all but the ublox device use VBACKUP for the backup supply, do you
> mind if I change the binding to use "vbackup-supply" instead of
> "v-bckp-supply" (which is a ublox-ism) when applying?

I don't mind. You can go ahead and change the binding.
For reference, the v4 patch serie:
https://lkml.kernel.org/r/1550070569-18588-1-git-send-email-lollivier@baylibre.com

Thanks,
Loys

>
> Thanks,
> Johan


-- 
-L