MIPS: JZ4740: probe interrupt controller via DT

Declare the JZ4740 interrupt controller for probe via DT using the
standard irqchip_init function, and make use of that function to probe
the controller by adding the appropriate node to the JZ4740 dtsi.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: Brian Norris <computersforpeace@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/10135/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/boot/dts/ingenic/jz4740.dtsi

@@ -9,4 +9,15 @@
 		interrupt-controller;
 		compatible = "mti,cpu-interrupt-controller";
 	};
+
+	intc: interrupt-controller@10001000 {
+		compatible = "ingenic,jz4740-intc";
+		reg = <0x10001000 0x14>;
+
+		interrupt-controller;
+		#interrupt-cells = <1>;
+
+		interrupt-parent = <&cpuintc>;
+		interrupts = <2>;
+	};
 };

arch/mips/include/asm/mach-jz4740/irq.h

@@ -54,6 +54,4 @@
 
 #define NR_IRQS (JZ4740_IRQ_ADC_BASE + 6)
 
-extern void __init jz4740_intc_init(void);
-
 #endif

arch/mips/jz4740/irq.c

@@ -18,6 +18,7 @@
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
+#include <linux/of_irq.h>
 #include <linux/timex.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
@@ -32,6 +33,8 @@
 
 #include "irq.h"
 
+#include "../../drivers/irqchip/irqchip.h"
+
 static void __iomem *jz_intc_base;
 
 #define JZ_REG_INTC_STATUS	0x00
@@ -77,7 +80,8 @@ static struct irqaction jz4740_cascade_action = {
 	.name = "JZ4740 cascade interrupt",
 };
 
-void __init jz4740_intc_init(void)
+static int __init jz4740_intc_of_init(struct device_node *node,
+	struct device_node *parent)
 {
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
@@ -105,7 +109,9 @@ void __init jz4740_intc_init(void)
 	irq_setup_generic_chip(gc, IRQ_MSK(32), 0, 0, IRQ_NOPROBE | IRQ_LEVEL);
 
 	setup_irq(2, &jz4740_cascade_action);
+	return 0;
 }
+IRQCHIP_DECLARE(jz4740_intc, "ingenic,jz4740-intc", jz4740_intc_of_init);
 
 #ifdef CONFIG_DEBUG_FS
 

arch/mips/jz4740/setup.c

@@ -25,7 +25,6 @@
 #include <asm/prom.h>
 
 #include <asm/mach-jz4740/base.h>
-#include <asm/mach-jz4740/irq.h>
 
 #include "reset.h"
 
@@ -84,5 +83,4 @@ const char *get_system_type(void)
 void __init arch_init_irq(void)
 {
 	irqchip_init();
-	jz4740_intc_init();
 }