linux-kernel - Re: [PATCH 2/2] uio: add an of

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Date:	Mon, 15 Jun 2009 01:50:53 +0200
From:	"Hans J. Koch" <hjk@...utronix.de>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	"Hans J. Koch" <hjk@...utronix.de>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	devicetree-discuss@...abs.org, Magnus Damm <magnus.damm@...il.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Greg KH <gregkh@...e.de>
Subject: Re: [PATCH 2/2] uio: add an of_genirq driver

On Mon, Jun 15, 2009 at 01:46:43AM +0200, Wolfram Sang wrote:
> 
> > driver. A user _has_ to setup irq, if there is none, he still has to set
> > irq=UIO_IRQ_NONE. For that matter, 'not specified' and 'not found' is both
> > the same bad thing.
> 
> Hmm, what should I do?
> 
> A typical interrupts-property in a device-tree is specified as:
> 
> 	interrupts = <&irq_controller_node irq_number irq_sense>;
> 
> Something like UIO_IRQ_NONE does not fit into this scheme, even more as it is
> Linux-specific and device trees need to be OS independant.
> 
> I'm pretty sure the correct way to state that you don't need an interrupt in
> the device-tree is to simply not specify the above interrupt property.
> 
> Well, yes, that means you can't distinguish between 'forgotten' and
> 'intentionally left out'. I wonder if it is really that bad? If something does
> not work (= one is missing interrupts), the first place to look at is the
> device tree. If one does not see an interrupt-property, voila, problem solved.
> 
> (Note that with my latest suggestion, a _wrong_ interrupt is handled the same
> way as with platform_data. request_irq() should equally fail if the
> return-value from irq_of_parse_and_map() is simply forwarded.)

I agree. And assuming Alan is right, forget what I said about IRQ 0 being a
valid interrupt number.

Thanks,
Hans

> 
> -- 
> Pengutronix e.K.                           | Wolfram Sang                |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |


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