linux-kernel - Re: [PATCH 3/3] TTY/slave: add driver for w2sg0004 GPS

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Date:	Mon, 15 Dec 2014 11:39:54 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	NeilBrown <neilb@...e.de>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Rutland <mark.rutland@....com>,
	Jiri Slaby <jslaby@...e.cz>, NeilBrown <neil@...wn.name>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] TTY/slave: add driver for w2sg0004 GPS

> > Am I missing some w2sg004 specific bits here ?
> 
> There is particular behaviour that the device is both turned on and turned
> off by toggling a GPIO, and the only way to detect which state it is in is
> to watch the RX uart line (by reconfiguring it as a GPIO).

Ok so it is somewhat different to things like the Broadcom and the more
usual 'wait for idle, drop power' setup.


Alan
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