irqchip: Convert all alloc/xlate users from of_node to fwnode

Since we now have a generic data structure to express an
interrupt specifier, convert all hierarchical irqchips that
are OF based to use a fwnode_handle as part of their alloc
and xlate (which becomes translate) callbacks.

As most of these drivers have dependencies (they exchange IRQ
specifiers), change them all in a single, massive patch...

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-and-tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: Graeme Gregory <graeme@xora.org.uk>
Cc: Jake Oshins <jakeo@microsoft.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Link: http://lkml.kernel.org/r/1444737105-31573-6-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/irqchip/irq-gic-v3-its.c

@@ -1265,15 +1265,19 @@ static int its_irq_gic_domain_alloc(struct irq_domain *domain,
 				    unsigned int virq,
 				    irq_hw_number_t hwirq)
 {
-	struct of_phandle_args args;
+	struct irq_fwspec fwspec;
 
-	args.np = irq_domain_get_of_node(domain->parent);
-	args.args_count = 3;
-	args.args[0] = GIC_IRQ_TYPE_LPI;
-	args.args[1] = hwirq;
-	args.args[2] = IRQ_TYPE_EDGE_RISING;
+	if (irq_domain_get_of_node(domain->parent)) {
+		fwspec.fwnode = domain->parent->fwnode;
+		fwspec.param_count = 3;
+		fwspec.param[0] = GIC_IRQ_TYPE_LPI;
+		fwspec.param[1] = hwirq;
+		fwspec.param[2] = IRQ_TYPE_EDGE_RISING;
+	} else {
+		return -EINVAL;
+	}
 
-	return irq_domain_alloc_irqs_parent(domain, virq, 1, &args);
+	return irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
 }
 
 static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,