linux-kernel - Re: [PATCH 2/3] MFD: twl6040: Allocate IRQ numbers dynamically

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Message-ID: <20120507094925.GE4415@opensource.wolfsonmicro.com>
Date:	Mon, 7 May 2012 10:49:26 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>, linux-kernel@...r.kernel.org,
	Misael Lopez Cruz <misael.lopez@...com>,
	Benoit Cousson <b-cousson@...com>,
	devicetree-discuss@...ts.ozlabs.org, Liam Girdwood <lrg@...com>
Subject: Re: [PATCH 2/3] MFD: twl6040: Allocate IRQ numbers dynamically

On Mon, May 07, 2012 at 09:49:55AM +0300, Peter Ujfalusi wrote:
> On 05/04/2012 03:47 PM, Mark Brown wrote:

> >> If there is "irq expander" type of chip I assume it would have similar
> >> way to get the IRQ number based on either GPIO number or some other
> >> enumeration value.

> > No, there's no generic interface for this.

> This dynamic range allocation for IRQ, GPIO will work nicely with DT at
> the end. In legacy way we will need to have workarounds. Or just forget
> about booting without DT.

Device tree is only available for a small minority of architectures.
Just as you shouldn't assume that people only ever use the reference
boards you work on so you should also not assume that people are using
ARM (and ARM systems that support DT at at that).

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