linux-kernel - Using serial driver 16550A in poll mode without interrupt connected

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Date:	Wed, 12 Oct 2011 15:03:39 +0200
From:	Michal Simek <monstr@...str.eu>
To:	linux-serial@...r.kernel.org
CC:	Greg Kroah-Hartman <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Korsgaard <jacmet@...site.dk>
Subject: Using serial driver 16550A in poll mode without interrupt connected

Hi,

we have internal discussion around serial drivers and their usage without interrupts
in polling mode. It is on FPGA with Microblaze/PPC/ARM and
it is easy for us to have serial IP without IRQ connected to the interrupt controller.

Driver is probed with no IRQ (NO_IRQ = -1 on Microblaze)
83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = -1) is a 16550A

writing any data to ttyS0 return -1.
Is there any reason no to use driver in poll mode especially for user applications
not for consoles.

Is it possible to use serial driver without IRQ - or blocking IRQ, etc.?

Currently we care about uart16550 and uarlite.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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