linux-kernel - Re: [PATCH v7 3/6] DTS: gta04: add uart2 child node for w2sg0004 GPS receiver

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Message-ID: <20180614194428.GA17808@amd>
Date:   Thu, 14 Jun 2018 21:44:38 +0200
From:   Pavel Machek <pavel@....cz>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Johan Hovold <johan@...nel.org>, afd@...com,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kevin Hilman <khilman@...libre.com>,
        Andreas Färber <afaerber@...e.de>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Noralf Trønnes <noralf@...nnes.org>,
        David Lechner <david@...hnology.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 3/6] DTS: gta04: add uart2 child node for w2sg0004 GPS
 receiver

On Thu 2018-05-03 11:35:48, H. Nikolaus Schaller wrote:
> GTA04 has a W2SG0004 module connected to UART2 of the OMAP3
> processor. A GPIO can pulse the on/off toggle switch.
> 
> Note that there is no WAKEUP output from the W2SG0004,
> hence we can't use the generic SirfStar binding.
> 
> The VSIM regulator is used to power on/off the LNA of an
> external active GPS antenna so that a driver can turn the
> LNA off if GPS is not needed to save battery energy.

This reads as if you did low->high->low to turn GPS on, then
low->high->low to turn GPS off again. Is that correct?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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