linux-kernel - Re: [PATCH 5/6 v3] mfd: tps65910-irq: Add devicetree init support

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Date:	Fri, 11 May 2012 12:45:32 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Rhyland Klein <rklein@...dia.com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Liam Girdwood <lrg@...com>, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 5/6 v3] mfd: tps65910-irq: Add devicetree init support

On Tue, 8 May 2012 16:48:21 +0100, Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:
> On Tue, May 08, 2012 at 11:42:42AM -0700, Rhyland Klein wrote:
> 
> > +	if (pdata->irq_base <= 0)
> > +		pdata->irq_base = irq_alloc_descs(-1, 0, tps65910->irq_num, -1);
> > +
> > +	if (pdata->irq_base <= 0) {
> > +		dev_err(tps65910->dev, "Failed to allocate irq descs: %d\n",
> > +			pdata->irq_base);
> > +		return pdata->irq_base;
> > +	}
> 
> I'd expect the driver to always call irq_alloc_descs() but to use the
> value specified in platform data if there is any.  This is the normal
> way of doing things, anyway.

More importantly, the driver should be converted to use an irq_domain
and remove the custom irq_to_tps65910_irq function.
irq_find_mapping() handles the hwirq --> irq lookup and
irq_data->hwirq will always give you the controller's irq number.

When irq_base is -1, then use irq_domain_add_linear() which will also
manage irq_desc allocations for you.  If the driver requires a
specific irq_base then the descs still need to be manually allocated
and use an irq_domain_add_legacy() to set it up. (this is sub-optimal
though; I hope to have a better solution for legacy that also manages
desc allocations just like the other mappings; maybe in the 3.6
timeframe).

g.

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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