linux-kernel - Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to platform devices

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Date:	Wed, 25 Jul 2007 18:38:23 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Andi Kleen <andi@...stfloor.org>, Jeff Garzik <jeff@...zik.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	SÃ©bastien DuguÃ© 
	<sebastien.dugue@...l.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to
 platform devices - broke my serial console

> The IR driver would be the clear owner of the entire device.  Of course,
> this still only works if we get rid of the 8250 blind probe for 0x3e8
> or figure out some API for the IR driver to tell the 8250 driver to get
> its mitts off.

As far as I can see all we need is something of the form


	serial8250_claim_uart(unsigned long ioaddr, int type)  

(type as we don't have iomap on most platforms yet)

	returning

		-EBUSY		"serial port is open"
		-ENOENT		"never heard of it"
		0		"ok"

and
	serial8250_unclaim_uart(unsigned long ioaddr, int type)

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