linux-kernel - Re: [PATCH] serial: 8250: Make ISA ports optional

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Date:	Thu, 8 Jan 2015 13:10:08 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Tony Lindgren <tony@...mide.com>,
	Grant Likely <grant.likely@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] serial: 8250: Make ISA ports optional

On Mon,  5 Jan 2015 22:09:45 -0500
Peter Hurley <peter@...leysoftware.com> wrote:

> Some arches have no need to create unprobed 8250 ports; these phantom
> ports are primarily required for ISA ports which have no probe
> mechanism or to provide non-operational ports for userspace to
> configure (via TIOCSSERIAL and TIOCSERCONFIG ioctls).
> 
> Provide CONFIG_SERIAL_8250_PHANTOM_UARTS knob to disable phantom port
> registration; ie., CONFIG_SERIAL_8250_PHANTOM_UARTS=N only registers
> probed ports (ACPI/PNP, "serial8250" platform devices, PCI, etc).

Just #define serial8250_isa_devs to 0 on such platforms. gcc should then
be bright enough to do the rest for you.

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