linux-kernel - Re: [PATCH] PPS: Restore lost capture-clear option to pps-gpio module.

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Message-ID: <1428584709.7346.25.camel@pengutronix.de>
Date:	Thu, 09 Apr 2015 15:05:09 +0200
From:	Jan Lübbe <jlu@...gutronix.de>
To:	"Gary E. Miller" <gem@...lim.com>
Cc:	linux-kernel@...r.kernel.org,
	Rodolfo Giometti <giometti@...eenne.com>,
	Ricardo Martin s <rasm@...up.pt>,
	James Nus s <jamesnuss@...ometrics.ca>
Subject: Re: [PATCH] PPS: Restore lost capture-clear option to pps-gpio
 module.

Hi Gary,

On Do, 2015-04-02 at 12:21 -0700, Gary E. Miller wrote:
> In the conversion from platform to device tree the capture-clear
> option was lost.
> 
> capture-clear is needed so that time_pps_fetch() will report both
> edges of each PPS pulse.  Both edges are needed so that userland
> programs, like gpsd, can autodetect the leading and trailing PPS
> edges.

This is intentional. The userspace program can configure which edges it
wants to capture at runtime. Only the polarity (assert-falling-edge) is
actually determined by the hardware and must be described in the device
tree.

Regards,
Jan
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