linux-kernel - Re: [PATCH v3] uio/pdrv

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Date:	Mon, 18 Apr 2011 13:10:51 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Paul Mundt <lethal@...ux-sh.org>
CC:	devicetree-discuss@...ts.ozlabs.org, grant.likely@...retlab.ca,
	john.williams@...alogix.com, linux-kernel@...r.kernel.org,
	hjk@...sjkoch.de, w.sang@...gutronix.de, arnd@...db.de
Subject: Re: [PATCH v3] uio/pdrv_genirq: Add OF support

Paul Mundt wrote:
> On Mon, Apr 18, 2011 at 10:50:54AM +0200, Michal Simek wrote:
>> Adding OF binding to genirq.
>> Version string is setup to the "devicetree".
>>
>> Compatible string is not setup for now but you can add your
>> custom compatible string to uio_of_genirq_match structure.
>>
>> For example with "uio" compatible string:
>> static const struct of_device_id __devinitconst uio_of_genirq_match[] = {
>> 	{ .compatible = "uio", },
>> 	{ /* empty for now */ },
>> };
>>
>> Signed-off-by: Michal Simek <monstr@...str.eu>
>>
> Perhaps a silly question, but how are you planning on differentiating
> between uio_pdrv and uio_pdrv_genirq binding if someone has both enabled?

It is not a silly question. OF support in uio_pdrv_genirq can handle both cases 
with/without IRQ (I tested it) and I don't want to add OF support to uio_pdrv.
Not sure if uio_pdrv_genirq without OF can handle UIO without IRQ.

> uio_pdrv obviously doesn't have OF bindings at the moment, but it seems
> like you could easily parse the memory ranges in addition to the IRQ and
> come up with a generic binding that would work for both.

I think the question is if uio_pdrv_genirq can handle both cases, if yes, we can 
completely remove uio_pdrv. But it is up to UIO maintainers.

> 
> We also have a shiny new Documentation/devicetree these days, so it would
> be nice to see the binding documented at the same time.

Sure - make sense.

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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