MIPS: JZ4770: Add initial device-tree support

arch/mips/Kconfig

@@ -283,6 +283,8 @@ config MACH_JZ4770
 	select JZSOC
 	select JZRISC
 	select PINCTRL
+	select BUILTIN_DTB
+	select USE_OF
 	select CPU_SUPPORTS_CPUFREQ
 	select MIPS_EXTERNAL_TIMER
 

arch/mips/boot/dts/jz4770.dtsi

@@ -0,0 +1,12 @@
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	compatible = "ingenic,jz4770";
+
+	cpuintc: cpuintc@0 {
+		#address-cells = <0>;
+		#interrupt-cells = <1>;
+		interrupt-controller;
+		compatible = "mti,cpu-interrupt-controller";
+	};
+};

arch/mips/jz4770/setup.c

@@ -26,6 +26,8 @@
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/ioport.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
 #include <linux/tty.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>
@@ -39,6 +41,7 @@
 #include <asm/mipsregs.h>
 #include <asm/reboot.h>
 #include <asm/pgtable.h>
+#include <asm/prom.h>
 #include <asm/time.h>
 #include <asm/page.h>
 
@@ -179,6 +182,7 @@ void __init plat_mem_setup(void)
 	iomem_resource.end	= 0xffffffff;
 
 	jz_reset_init();
+	__dt_setup_arch(__dtb_start);
 
 	jz_soc_setup();
 	jz_serial_setup();
@@ -205,3 +209,18 @@ void __init jz4770_reserve_unsafe_for_dma(void)
 		break;
 	}
 }
+
+void __init device_tree_init(void)
+{
+	if (!initial_boot_params)
+		return;
+
+	unflatten_and_copy_device_tree();
+}
+
+static int __init populate_machine(void)
+{
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+	return 0;
+}
+arch_initcall(populate_machine);