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

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Message-ID: <20141211230404.GC11666@earth.universe>
Date:	Fri, 12 Dec 2014 00:04:05 +0100
From:	Sebastian Reichel <sre@...nel.org>
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

Hi,

On Fri, Dec 12, 2014 at 08:59:44AM +1100, NeilBrown wrote:
> This uart-attatched GPS device has a toggle which turns
> both on and off.  For reliable use we need to know what
> start it is in.

I guess you mean "what state it is in"?

> So it registers with the tty for recv events when the tty
> is open, and optionally configures the RX pin as a GPIO
> interrupt when the tty is closed.
> 
> If it detects data when it should be off, or a lack of data
> when it should be on, it toggles the line.
> 
> A regulator can also be configured to power the antenna.
> In this case an rfkill device is created.  When the rfkill
> is 'blocked' or the device is otherwise powered down,
> the regulator is turned off.

[...]

> index 000000000000..c9e7838b3198
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/slave-w2sg0004.txt
> @@ -0,0 +1,35 @@
> +w2sg0004 UART-attached GPS receiver
> +
> +Required properties:
> +- compatbile: "tty,w2sg0004"

grep tty 

$ grep -c tty Documentation/devicetree/bindings/vendor-prefixes.txt
0

This should be something like "wi2wi,w2sg0004"

[...]

-- Sebastian

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