linux-kernel - Re: [PATCH] serial: DCC(JTAG) serial and console emulation support

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Date:	Thu, 07 Oct 2010 13:37:11 -0700
From:	Daniel Walker <dwalker@...eaurora.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Mike Frysinger <vapier@...too.org>, linux-kernel@...r.kernel.org,
	"Hyok S. Choi" <hyok.choi@...sung.com>,
	Tony Lindgren <tony@...mide.com>,
	Jeff Ohlstein <johlstei@...cinc.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Ben Dooks <ben-linux@...ff.org>,
	Alan Cox <alan@...ux.intel.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Feng Tang <feng.tang@...el.com>,
	Tobias Klauser <tklauser@...tanz.ch>,
	Jason Wessel <jason.wessel@...driver.com>,
	Philippe Langlais <philippe.langlais@...ricsson.com>
Subject: Re: [PATCH] serial: DCC(JTAG) serial and console emulation support

On Thu, 2010-10-07 at 21:52 +0100, Alan Cox wrote:
> On Thu, 7 Oct 2010 15:25:34 -0400
> Mike Frysinger <vapier@...too.org> wrote:
> 
> > On Thu, Oct 7, 2010 at 14:36, Daniel Walker wrote:
> > > Many of JTAG debuggers for ARM support DCC protocol over JTAG
> > > connection, which is very useful to debug hardwares which has no
> > > serial port. This patch adds DCC serial emulation and the console
> > > support. System timer based polling method is used for the
> > > emulation of serial input interrupt handling.
> > 
> > why use serial_core at all ?  seems like you could just use the tty
> > layer directly.  i did that with drivers/char/bfin_jtag_comm.c.
> 
> I would agree 100% with this for the driver in question. The tty_port
> helpers now make it trivial to do so and it'll be small and clean as a
> result.

Can you give some example of other drivers which have done this?

Daniel

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