linux-kernel - Re: [PATCH 5/6] gnss: motmdm: Add support for Motorola Mapphone MDM6600 modem

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Message-ID: <20200501205151.GG6043@duo.ucw.cz>
Date:   Fri, 1 May 2020 22:51:51 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>, Rob Herring <robh@...nel.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Lee Jones <lee.jones@...aro.org>, Jiri Slaby <jslaby@...e.cz>,
        Merlijn Wajer <merlijn@...zup.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Sebastian Reichel <sre@...nel.org>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 5/6] gnss: motmdm: Add support for Motorola Mapphone
 MDM6600 modem

On Thu 2020-04-30 10:46:14, Tony Lindgren wrote:
> Motorola is using a custom TS 27.010 based serial port line discipline
> for various devices on the modem. These devices can be accessed on
> dedicated channels using Linux kernel serdev-ngsm driver.
> 
> For the GNSS on these devices, we need to kick the GNSS device at a
> desired rate. Otherwise the GNSS device stops sending data after a
> few minutes. The rate we poll data defaults to 1000 ms, and can be
> specified with a module option rate_ms between 1 to 16 seconds.
> 
> Note that AGPS with xtra2.bin is not yet supported, so getting a fix
> can take quite a while. And a recent gpsd is needed to parse the
> $GNGNS output, and to properly handle the /dev/gnss0 character device.
> I've confirmed it works properly with gpsd-3.20.
> 
> Signed-off-by: Tony Lindgren <tony@...mide.com>

Reviewed-by: Pavel Machek <pavel@....cz>

-- 
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