mpc85xx: disable the i8259 irq on mpc8548cds (but leave the controller initialized) - it shares an irq with the pcie device which causes irq storms

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25037 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/mpc85xx/patches/120-mpc8548_cds_i8259_noirq_init.patch

@@ -0,0 +1,23 @@
+--- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c
++++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
+@@ -234,15 +234,16 @@ static int mpc85xx_cds_8259_attach(void)
+ 		return -ENODEV;
+ 	}
+ 
++	i8259_init(cascade_node, 0);
++	of_node_put(cascade_node);
++
+ 	cascade_irq = irq_of_parse_and_map(cascade_node, 0);
+ 	if (cascade_irq == NO_IRQ) {
+-		printk(KERN_ERR "Failed to map cascade interrupt\n");
++		of_node_put(cascade_node);
++		printk(KERN_DEBUG "No interrupt for i8259 PIC\n");
+ 		return -ENXIO;
+ 	}
+ 
+-	i8259_init(cascade_node, 0);
+-	of_node_put(cascade_node);
+-
+ 	/*
+ 	 *  Hook the interrupt to make sure desc->action is never NULL.
+ 	 *  This is required to ensure that the interrupt does not get

target/linux/mpc85xx/patches/130-mpc8548_cds_disable_i8259_irq.patch

@@ -0,0 +1,13 @@
+--- a/arch/powerpc/boot/dts/mpc8548cds.dts
++++ b/arch/powerpc/boot/dts/mpc8548cds.dts
+@@ -492,8 +492,10 @@
+ 					#address-cells = <0>;
+ 					#interrupt-cells = <2>;
+ 					compatible = "chrp,iic";
++/*
+ 					interrupts = <0 1>;
+ 					interrupt-parent = <&mpic>;
++*/
+ 				};
+ 
+ 				rtc@70 {