linux-kernel - Re: [PATCH 08/14] mfd: Add IRQ domain support for the AB8500

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Date:	Thu, 14 Jun 2012 19:32:32 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	grant.likely@...retlab.ca, linus.walleij@...ricsson.com,
	arnd@...db.de, Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 08/14] mfd: Add IRQ domain support for the AB8500

On Mon, Jun 11, 2012 at 04:25:01PM +0100, Lee Jones wrote:

> +	if (np) {
> +		ab8500->domain = irq_domain_add_linear(
> +			np, num_irqs, &ab8500_irq_ops, ab8500);
> +	}
> +	else {
> +		ab8500->domain = irq_domain_add_legacy(
> +			NULL, num_irqs, ab8500->irq_base,
> +			0, &ab8500_irq_ops, ab8500);
> +	}

This is odd, why are you forcing non-DT systems to use a legacy mapping?
The more usual approach is to use a legacy mapping if and only if a base
for the legacy range has been provided, otherwise the system will
needlessly fail to initialise the device...

> +	if (!(ab8500->irq_base || np)) {
> +		dev_info(&pdev->dev, "couldn't find irq-base and not doing DT boot\n");

...like this.  See regmap_irq for an example.
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