linux-kernel - Re: [PATCH] Fix Winbond CIR driver initialisation

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Date:	Sun, 7 Nov 2010 20:00:09 +0100
From:	David Härdeman <david@...deman.nu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Sean Young <sean@...s.org>, linux-kernel@...r.kernel.org,
	jesse.barnes@...el.com
Subject: Re: [PATCH] Fix Winbond CIR driver initialisation

On Sun, Nov 07, 2010 at 03:46:48PM +0000, Alan Cox wrote:
> > A workaround is to boot with argument 8250.nr_uarts=1. This is not really 
> > desirable, so this patch makes ttyS1 go away.
> 
> setserial can also be used for this surely ?

That's about as user-unfriendly as the boot option.

> > +		dev_info(device, "Unregistering phony serial port ttyS1\n");
> > +		serial8250_unregister_port(1);
> > +		ok = request_region(data->sbase, SP_IOMEM_LEN, DRVNAME);
> 
> That's a hack that is only going to work on specific systems where it is
> mapped the way you expect and doing stuff behind the back of the serial
> driver.
> 
> I'm not averse to a better solution but it needs to be general and
> maintainable. Is there a way to identify the presence of the windbond CIR
> device as opposed to an 8250 ?

Not sure which kind of identification you're looking for but would a PNP
id be sufficient?

-- 
David Härdeman
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