[PATCH v4 29/39] irqchip/atmel-aic5: Add support to get nirqs from DT for sam9x60 & sam9x7

[Varshini Rajendran]

Add support to get number of IRQs from the respective DT node for sam9x60
and sam9x7 devices. Since only this factor differs between the two SoCs,
this patch adds support for the same. Adapt the sam9x60 dtsi
accordingly.

Signed-off-by: Varshini Rajendran <varshini.rajendran@xxxxxxxxxxxxx>
---
Changes in v4:
- Changed the implementation to fetch the NIRQs from DT as per the
  comment to avoid introducing a new compatible when this is the only
  difference between the SoCs related to this IP.
---
 arch/arm/boot/dts/microchip/sam9x60.dtsi |  1 +
 drivers/irqchip/irq-atmel-aic5.c         | 11 ++++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/microchip/sam9x60.dtsi b/arch/arm/boot/dts/microchip/sam9x60.dtsi
index 73d570a17269..e405f68c9f54 100644
--- a/arch/arm/boot/dts/microchip/sam9x60.dtsi
+++ b/arch/arm/boot/dts/microchip/sam9x60.dtsi
@@ -1201,6 +1201,7 @@ aic: interrupt-controller@fffff100 {
 				interrupt-controller;
 				reg = <0xfffff100 0x100>;
 				atmel,external-irqs = <31>;
+				microchip,nr-irqs = <50>;
 			};
 
 			dbgu: serial@fffff200 {
diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c
index 145535bd7560..5d96ad8860d3 100644
--- a/drivers/irqchip/irq-atmel-aic5.c
+++ b/drivers/irqchip/irq-atmel-aic5.c
@@ -398,11 +398,16 @@ static int __init sama5d4_aic5_of_init(struct device_node *node,
 }
 IRQCHIP_DECLARE(sama5d4_aic5, "atmel,sama5d4-aic", sama5d4_aic5_of_init);
 
-#define NR_SAM9X60_IRQS		50
-
 static int __init sam9x60_aic5_of_init(struct device_node *node,
 				       struct device_node *parent)
 {
-	return aic5_of_init(node, parent, NR_SAM9X60_IRQS);
+	int ret, nr_irqs;
+
+	ret = of_property_read_u32(node, "microchip,nr-irqs", &nr_irqs);
+	if (ret) {
+		pr_err("Not found microchip,nr-irqs property\n");
+		return ret;
+	}
+	return aic5_of_init(node, parent, nr_irqs);
 }
 IRQCHIP_DECLARE(sam9x60_aic5, "microchip,sam9x60-aic", sam9x60_aic5_of_init);
-- 
2.25.1