linux-kernel - Re: [PATCH v2] irqchip: Add support for ARMv7-M's NVIC

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Message-Id: <201303282232.42955.arnd@arndb.de>
Date:	Thu, 28 Mar 2013 22:32:42 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	"Uwe Kleine-König" <u.kleine-koenig@...gutronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Austin <jonathan.austin@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] irqchip: Add support for ARMv7-M's NVIC

On Monday 18 March 2013, Uwe Kleine-König wrote:

> +static int __init nvic_init_bases(struct device_node *node,
> +				  void __iomem *nvic_base)
> +{

There is probably no point to keep this function separate from
nvic_of_init any more, unless you plan to mke it globally
accessible and called from non-DT platforms. In that case
you would need an irq_base argument though.

> +	irq_base = irq_alloc_descs_from(16, irqs, numa_node_id());
> +	if (irq_base < 0) {
> +		pr_warn("Cannot allocate irq_descs\n");
> +		ret = irq_base;
> +		goto err_irq_alloc_descs;
> +	}
> +	if (irq_base != 16) {
> +		/*
> +		 * The entry code just passes the exception number (i.e. irq
> +		 * number + 16) to asm_do_IRQ, so the offset needs to be fixed
> +		 * here.
> +		 */
> +		pr_warn("Failed to allocate irq_descs at offset 16\n");
> +		goto err_wrong_irq_base;
> +	}
> +
> +	irq_domain = irq_domain_add_legacy(node, irqs, irq_base, 0,
> +					   &irq_domain_simple_ops, NULL);

Why do you use a legacy domain here, and hardcode the irq_base?
For a fully DT-enabled platform, the base should not matter and you
can use irq_domain_add_linear, while a legacy platform would likely
need a different base.

> +static int __init nvic_of_init(struct device_node *node,
> +			       struct device_node *parent)
> +{
> +	void __iomem *nvic_base;
> +
> +	if (!node)
> +		return -ENODEV;

As Thomas commented, the check for !node is pointless here.

	Arnd
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