ARM: at91: aic add dt support for external irqs

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

Documentation/devicetree/bindings/arm/atmel-aic.txt

@@ -15,6 +15,7 @@ Required properties:
       Valid combinations are 1, 2, 3, 4, 8.
       Default flag for internal sources should be set to 4 (active high).
 - reg: Should contain AIC registers location and length
+- atmel,external-irqs: u32 array of external irqs.
 
 Examples:
 	/*

arch/arm/boot/dts/at91sam9260.dtsi

@@ -56,6 +56,7 @@
 				compatible = "atmel,at91rm9200-aic";
 				interrupt-controller;
 				reg = <0xfffff000 0x200>;
+				atmel,external-irqs = <29 30 31>;
 			};
 
 			ramc0: ramc@ffffea00 {

arch/arm/boot/dts/at91sam9263.dtsi

@@ -52,6 +52,7 @@
 				compatible = "atmel,at91rm9200-aic";
 				interrupt-controller;
 				reg = <0xfffff000 0x200>;
+				atmel,external-irqs = <30 31>;
 			};
 
 			pmc: pmc@fffffc00 {

arch/arm/boot/dts/at91sam9g45.dtsi

@@ -57,6 +57,7 @@
 				compatible = "atmel,at91rm9200-aic";
 				interrupt-controller;
 				reg = <0xfffff000 0x200>;
+				atmel,external-irqs = <31>;
 			};
 
 			ramc0: ramc@ffffe400 {

arch/arm/boot/dts/at91sam9x5.dtsi

@@ -55,6 +55,7 @@
 				compatible = "atmel,at91rm9200-aic";
 				interrupt-controller;
 				reg = <0xfffff000 0x200>;
+				atmel,external-irqs = <31>;
 			};
 
 			ramc0: ramc@ffffe800 {

arch/arm/mach-at91/at91sam9x5.c

@@ -312,8 +312,6 @@ static void __init at91sam9x5_map_io(void)
 
 void __init at91sam9x5_initialize(void)
 {
-	at91_extern_irq = (1 << AT91SAM9X5_ID_IRQ0);
-
 	/* Register GPIO subsystem (using DT) */
 	at91_gpio_init(NULL, 0);
 }

arch/arm/mach-at91/irq.c

@@ -194,6 +194,10 @@ static struct irq_domain_ops at91_aic_irq_ops = {
 int __init at91_aic_of_init(struct device_node *node,
 				     struct device_node *parent)
 {
+	struct property *prop;
+	const __be32 *p;
+	u32 val;
+
 	at91_aic_base = of_iomap(node, 0);
 	at91_aic_np = node;
 
@@ -202,6 +206,14 @@ int __init at91_aic_of_init(struct device_node *node,
 	if (!at91_aic_domain)
 		panic("Unable to add AIC irq domain (DT)\n");
 
+	at91_extern_irq = 0;
+	of_property_for_each_u32(node, "atmel,external-irqs", prop, p, val) {
+		if (val > 31)
+			pr_warn("AIC: external irq %d > 31 skip it\n", val);
+		else
+			at91_extern_irq |= (1 << val);
+	}
+
 	irq_set_default_host(at91_aic_domain);
 
 	at91_aic_hw_init(NR_AIC_IRQS);