linux-kernel - Re: [PATCH 5/7] PPS: serial clients support.

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Message-ID: <20080411154652.4852b6d4@core>
Date:	Fri, 11 Apr 2008 15:46:52 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
Cc:	Rodolfo Giometti <giometti@...eenne.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH 5/7] PPS: serial clients support.

> I thought it just required that the uart driver call
> uart_handle_dcd_change when the state of the CD changes, and all the PPS
> stuff happened in that function.

uart_ is only used by some drivers. We have a whole army of drivers using
the tty layer directly and another army of drivers using the USB layer.

You also need a sensible way to talk to the devices, identify support and
avoid clashing uses of carrier pins.

Alan
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