powerpc/mpic: Search for open-pic device-tree node if NULL

Almost all PowerPC platforms use a standard "open-pic" device node so
the mpic_alloc() function now accepts NULL for the device-node.  This
will cause it to perform a default search with of_find_matching_node().

Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

23 files changed, 58 insertions, 244 deletions

diff --git a/arch/powerpc/platforms/85xx/corenet_ds.c b/arch/powerpc/platforms/85xx/corenet_ds.c
index 5b1c577199b..cfa4bada7eb 100644
--- a/arch/powerpc/platforms/85xx/corenet_ds.c
+++ b/arch/powerpc/platforms/85xx/corenet_ds.c
@@ -36,21 +36,13 @@
 void __init corenet_ds_pic_init(void)
 {
         struct mpic *mpic;
-        struct device_node *np = NULL;
         unsigned int flags = MPIC_PRIMARY | MPIC_BIG_ENDIAN |
                                 MPIC_BROKEN_FRR_NIRQS | MPIC_SINGLE_DEST_CPU;
 
-        np = of_find_node_by_type(np, "open-pic");
-
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
         if (ppc_md.get_irq == mpic_get_coreint_irq)
                 flags |= MPIC_ENABLE_COREINT;
 
-        mpic = mpic_alloc(np, 0, flags, 0, 256, " OpenPIC  ");
+        mpic = mpic_alloc(NULL, 0, flags, 0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
 
         mpic_init(mpic);
diff --git a/arch/powerpc/platforms/85xx/ksi8560.c b/arch/powerpc/platforms/85xx/ksi8560.c
index 3403b0e0143..1620fa87cd9 100644
--- a/arch/powerpc/platforms/85xx/ksi8560.c
+++ b/arch/powerpc/platforms/85xx/ksi8560.c
@@ -57,22 +57,10 @@ static void machine_restart(char *cmd)
 
 static void __init ksi8560_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 
         mpc85xx_cpm2_pic_init();
diff --git a/arch/powerpc/platforms/85xx/mpc8536_ds.c b/arch/powerpc/platforms/85xx/mpc8536_ds.c
index 5c20b28568b..07916d6e499 100644
--- a/arch/powerpc/platforms/85xx/mpc8536_ds.c
+++ b/arch/powerpc/platforms/85xx/mpc8536_ds.c
@@ -36,22 +36,11 @@
 
 void __init mpc8536_ds_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                           MPIC_PRIMARY | MPIC_WANTS_RESET |
                           MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 }
 
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_ads.c b/arch/powerpc/platforms/85xx/mpc85xx_ads.c
index 4c1e9b67ac5..17c6f06e2d4 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_ads.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_ads.c
@@ -50,21 +50,10 @@ static int mpc85xx_exclude_device(struct pci_controller *hose,
 
 static void __init mpc85xx_ads_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np = NULL;
-
-        np = of_find_node_by_type(np, "open-pic");
-        if (!np) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 
         mpc85xx_cpm2_pic_init();
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
index 62b90c35969..cf209b3df7b 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
@@ -188,23 +188,10 @@ static struct irqaction mpc85xxcds_8259_irqaction = {
 static void __init mpc85xx_cds_pic_init(void)
 {
         struct mpic *mpic;
-        struct device_node *np = NULL;
-
-        np = of_find_node_by_type(np, "open-pic");
-
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-
-        /* Return the mpic node */
-        of_node_put(np);
-
         mpic_init(mpic);
 }
 
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_ds.c b/arch/powerpc/platforms/85xx/mpc85xx_ds.c
index 4fc6b801c55..104a09b9f6d 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_ds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_ds.c
@@ -63,27 +63,21 @@ static void mpc85xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
 void __init mpc85xx_ds_pic_init(void)
 {
         struct mpic *mpic;
-        struct device_node *np;
 #ifdef CONFIG_PPC_I8259
+        struct device_node *np;
         struct device_node *cascade_node = NULL;
         int cascade_irq;
 #endif
         unsigned long root = of_get_flat_dt_root();
 
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
         if (of_flat_dt_is_compatible(root, "fsl,MPC8572DS-CAMP")) {
-                mpic = mpic_alloc(np, 0,
+                mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY |
                         MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
                         MPIC_SINGLE_DEST_CPU,
                         0, 256, " OpenPIC  ");
         } else {
-                mpic = mpic_alloc(np, 0,
+                mpic = mpic_alloc(NULL, 0,
                           MPIC_PRIMARY | MPIC_WANTS_RESET |
                           MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
                           MPIC_SINGLE_DEST_CPU,
@@ -91,8 +85,6 @@ void __init mpc85xx_ds_pic_init(void)
         }
 
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 
 #ifdef CONFIG_PPC_I8259
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_mds.c b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
index 74b6da2e087..4e5431ad9d1 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_mds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
@@ -434,19 +434,11 @@ machine_arch_initcall(p1021_mds, swiotlb_setup_bus_notifier);
 
 static void __init mpc85xx_mds_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np = NULL;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (!np)
-                return;
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN |
                         MPIC_BROKEN_FRR_NIRQS | MPIC_SINGLE_DEST_CPU,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
 
         mpic_init(mpic);
         mpc85xx_mds_qeic_init();
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_rdb.c b/arch/powerpc/platforms/85xx/mpc85xx_rdb.c
index 2b299eba367..a68d92271c4 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_rdb.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_rdb.c
@@ -45,23 +45,16 @@
 void __init mpc85xx_rdb_pic_init(void)
 {
         struct mpic *mpic;
-        struct device_node *np;
         unsigned long root = of_get_flat_dt_root();
 
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
         if (of_flat_dt_is_compatible(root, "fsl,MPC85XXRDB-CAMP")) {
-                mpic = mpic_alloc(np, 0,
+                mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY |
                         MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
                         MPIC_SINGLE_DEST_CPU,
                         0, 256, " OpenPIC  ");
         } else {
-                mpic = mpic_alloc(np, 0,
+                mpic = mpic_alloc(NULL, 0,
                   MPIC_PRIMARY | MPIC_WANTS_RESET |
                   MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
                   MPIC_SINGLE_DEST_CPU,
@@ -69,10 +62,7 @@ void __init mpc85xx_rdb_pic_init(void)
         }
 
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
-
 }
 
 /*
diff --git a/arch/powerpc/platforms/85xx/p1010rdb.c b/arch/powerpc/platforms/85xx/p1010rdb.c
index dff49e83ba6..25f7375e092 100644
--- a/arch/powerpc/platforms/85xx/p1010rdb.c
+++ b/arch/powerpc/platforms/85xx/p1010rdb.c
@@ -32,16 +32,8 @@
 
 void __init p1010_rdb_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0, MPIC_PRIMARY | MPIC_WANTS_RESET |
+        struct mpic *mpic = mpic_alloc(NULL, 0,
+          MPIC_PRIMARY | MPIC_WANTS_RESET |
           MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS | MPIC_SINGLE_DEST_CPU,
           0, 256, " OpenPIC  ");
 
diff --git a/arch/powerpc/platforms/85xx/p1022_ds.c b/arch/powerpc/platforms/85xx/p1022_ds.c
index 6d684c2979a..6af5502b089 100644
--- a/arch/powerpc/platforms/85xx/p1022_ds.c
+++ b/arch/powerpc/platforms/85xx/p1022_ds.c
@@ -241,24 +241,12 @@ p1022ds_valid_monitor_port(enum fsl_diu_monitor_port port)
 
 void __init p1022_ds_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (!np) {
-                pr_err("Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                 MPIC_PRIMARY | MPIC_WANTS_RESET |
                 MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
                 MPIC_SINGLE_DEST_CPU,
                 0, 256, " OpenPIC  ");
-
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 }
 
diff --git a/arch/powerpc/platforms/85xx/p1023_rds.c b/arch/powerpc/platforms/85xx/p1023_rds.c
index df7ccf68821..b3c78fe0711 100644
--- a/arch/powerpc/platforms/85xx/p1023_rds.c
+++ b/arch/powerpc/platforms/85xx/p1023_rds.c
@@ -93,16 +93,7 @@ machine_device_initcall(p1023_rds, mpc85xx_common_publish_devices);
 
 static void __init mpc85xx_rds_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np = NULL;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (!np) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                 MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN |
                 MPIC_BROKEN_FRR_NIRQS | MPIC_SINGLE_DEST_CPU,
                 0, 256, " OpenPIC  ");
diff --git a/arch/powerpc/platforms/85xx/sbc8548.c b/arch/powerpc/platforms/85xx/sbc8548.c
index 5e16025a755..38d6945382b 100644
--- a/arch/powerpc/platforms/85xx/sbc8548.c
+++ b/arch/powerpc/platforms/85xx/sbc8548.c
@@ -54,24 +54,10 @@ static int sbc_rev;
 
 static void __init sbc8548_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np = NULL;
-
-        np = of_find_node_by_type(np, "open-pic");
-
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-
-        /* Return the mpic node */
-        of_node_put(np);
-
         mpic_init(mpic);
 }
 
diff --git a/arch/powerpc/platforms/85xx/sbc8560.c b/arch/powerpc/platforms/85xx/sbc8560.c
index 97f00dec0d9..7e6d7e5b8a4 100644
--- a/arch/powerpc/platforms/85xx/sbc8560.c
+++ b/arch/powerpc/platforms/85xx/sbc8560.c
@@ -41,21 +41,10 @@
 
 static void __init sbc8560_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np = NULL;
-
-        np = of_find_node_by_type(np, "open-pic");
-        if (!np) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 
         mpc85xx_cpm2_pic_init();
diff --git a/arch/powerpc/platforms/85xx/socrates.c b/arch/powerpc/platforms/85xx/socrates.c
index e87e75cdb94..8175f0a5e5f 100644
--- a/arch/powerpc/platforms/85xx/socrates.c
+++ b/arch/powerpc/platforms/85xx/socrates.c
@@ -46,21 +46,12 @@
 
 static void __init socrates_pic_init(void)
 {
-        struct mpic *mpic;
         struct device_node *np;
 
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (!np) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 
         np = of_find_compatible_node(NULL, NULL, "abb,socrates-fpga-pic");
diff --git a/arch/powerpc/platforms/85xx/stx_gp3.c b/arch/powerpc/platforms/85xx/stx_gp3.c
index 060d5148075..8ca1e61488d 100644
--- a/arch/powerpc/platforms/85xx/stx_gp3.c
+++ b/arch/powerpc/platforms/85xx/stx_gp3.c
@@ -48,21 +48,10 @@
 
 static void __init stx_gp3_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (!np) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 
         mpc85xx_cpm2_pic_init();
diff --git a/arch/powerpc/platforms/85xx/tqm85xx.c b/arch/powerpc/platforms/85xx/tqm85xx.c
index a46b9fc6620..6e7a8351e8f 100644
--- a/arch/powerpc/platforms/85xx/tqm85xx.c
+++ b/arch/powerpc/platforms/85xx/tqm85xx.c
@@ -46,21 +46,10 @@
 
 static void __init tqm85xx_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (!np) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET | MPIC_BIG_ENDIAN,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 
         mpc85xx_cpm2_pic_init();
diff --git a/arch/powerpc/platforms/85xx/xes_mpc85xx.c b/arch/powerpc/platforms/85xx/xes_mpc85xx.c
index 2be5e4de188..f94c6086849 100644
--- a/arch/powerpc/platforms/85xx/xes_mpc85xx.c
+++ b/arch/powerpc/platforms/85xx/xes_mpc85xx.c
@@ -43,22 +43,11 @@
 
 void __init xes_mpc85xx_pic_init(void)
 {
-        struct mpic *mpic;
-        struct device_node *np;
-
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (np == NULL) {
-                printk(KERN_ERR "Could not find open-pic node\n");
-                return;
-        }
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                           MPIC_PRIMARY | MPIC_WANTS_RESET |
                           MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
                         0, 256, " OpenPIC  ");
         BUG_ON(mpic == NULL);
-        of_node_put(np);
-
         mpic_init(mpic);
 }
 
diff --git a/arch/powerpc/platforms/86xx/pic.c b/arch/powerpc/platforms/86xx/pic.c
index f85c8f0aa96..ed85b3c8ed1 100644
--- a/arch/powerpc/platforms/86xx/pic.c
+++ b/arch/powerpc/platforms/86xx/pic.c
@@ -31,24 +31,17 @@ static void mpc86xx_8259_cascade(unsigned int irq, struct irq_desc *desc)
 
 void __init mpc86xx_init_irq(void)
 {
-        struct mpic *mpic;
-        struct device_node *np;
 #ifdef CONFIG_PPC_I8259
+        struct device_node *np;
         struct device_node *cascade_node = NULL;
         int cascade_irq;
 #endif
 
-        /* Determine PIC address. */
-        np = of_find_node_by_type(NULL, "open-pic");
-        if (np == NULL)
-                return;
-
-        mpic = mpic_alloc(np, 0,
+        struct mpic *mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_WANTS_RESET |
                         MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
                         MPIC_SINGLE_DEST_CPU,
                         0, 256, " MPIC     ");
-        of_node_put(np);
         BUG_ON(mpic == NULL);
 
         mpic_init(mpic);
diff --git a/arch/powerpc/platforms/embedded6xx/holly.c b/arch/powerpc/platforms/embedded6xx/holly.c
index d4fb41e29c3..5ed00a70a86 100644
--- a/arch/powerpc/platforms/embedded6xx/holly.c
+++ b/arch/powerpc/platforms/embedded6xx/holly.c
@@ -148,20 +148,13 @@ static void __init holly_setup_arch(void)
 static void __init holly_init_IRQ(void)
 {
         struct mpic *mpic;
-        struct device_node *tsi_pic;
 #ifdef CONFIG_PCI
         unsigned int cascade_pci_irq;
         struct device_node *tsi_pci;
         struct device_node *cascade_node = NULL;
 #endif
 
-        tsi_pic = of_find_node_by_type(NULL, "open-pic");
-        if (!tsi_pic) {
-                printk(KERN_ERR "%s: No tsi108 PIC found !\n", __func__);
-                return;
-        }
-
-        mpic = mpic_alloc(tsi_pic, 0,
+        mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
                         MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
                         24,
@@ -195,7 +188,6 @@ static void __init holly_init_IRQ(void)
 #endif
         /* Configure MPIC outputs to CPU0 */
         tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
-        of_node_put(tsi_pic);
 }
 
 void holly_show_cpuinfo(struct seq_file *m)
diff --git a/arch/powerpc/platforms/embedded6xx/linkstation.c b/arch/powerpc/platforms/embedded6xx/linkstation.c
index 72b36850c5e..502ff60db96 100644
--- a/arch/powerpc/platforms/embedded6xx/linkstation.c
+++ b/arch/powerpc/platforms/embedded6xx/linkstation.c
@@ -81,13 +81,9 @@ static void __init linkstation_setup_arch(void)
 static void __init linkstation_init_IRQ(void)
 {
         struct mpic *mpic;
-        struct device_node *dnp;
 
-        dnp = of_find_node_by_type(NULL, "open-pic");
-        if (dnp == NULL)
-                return;
-
-        mpic = mpic_alloc(dnp, 0, MPIC_PRIMARY | MPIC_WANTS_RESET, 4, 32, " EPIC     ");
+        mpic = mpic_alloc(NULL, 0, MPIC_PRIMARY | MPIC_WANTS_RESET,
+                        4, 32, " EPIC     ");
         BUG_ON(mpic == NULL);
 
         /* PCI IRQs */
diff --git a/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c b/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
index c8ce204abd2..e0f11279039 100644
--- a/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
+++ b/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
@@ -102,20 +102,13 @@ static void __init mpc7448_hpc2_setup_arch(void)
 static void __init mpc7448_hpc2_init_IRQ(void)
 {
         struct mpic *mpic;
-        struct device_node *tsi_pic;
 #ifdef CONFIG_PCI
         unsigned int cascade_pci_irq;
         struct device_node *tsi_pci;
         struct device_node *cascade_node = NULL;
 #endif
 
-        tsi_pic = of_find_node_by_type(NULL, "open-pic");
-        if (!tsi_pic) {
-                printk("%s: No tsi108 PIC found !\n", __func__);
-                return;
-        }
-
-        mpic = mpic_alloc(tsi_pic, 0,
+        mpic = mpic_alloc(NULL, 0,
                         MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
                         MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
                         24,
@@ -149,7 +142,6 @@ static void __init mpc7448_hpc2_init_IRQ(void)
 #endif
         /* Configure MPIC outputs to CPU0 */
         tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
-        of_node_put(tsi_pic);
 }
 
 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
diff --git a/arch/powerpc/platforms/embedded6xx/storcenter.c b/arch/powerpc/platforms/embedded6xx/storcenter.c
index 084f0fc706b..9bd15dfea57 100644
--- a/arch/powerpc/platforms/embedded6xx/storcenter.c
+++ b/arch/powerpc/platforms/embedded6xx/storcenter.c
@@ -83,17 +83,9 @@ static void __init storcenter_setup_arch(void)
 static void __init storcenter_init_IRQ(void)
 {
         struct mpic *mpic;
-        struct device_node *dnp;
 
-        dnp = of_find_node_by_type(NULL, "open-pic");
-        if (dnp == NULL)
-                return;
-
-        mpic = mpic_alloc(dnp, 0, MPIC_PRIMARY | MPIC_WANTS_RESET,
+        mpic = mpic_alloc(NULL, 0, MPIC_PRIMARY | MPIC_WANTS_RESET,
                         16, 32, " OpenPIC  ");
-
-        of_node_put(dnp);
-
         BUG_ON(mpic == NULL);
 
         /*
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index ef721c30f47..bb72a626648 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1143,8 +1143,24 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         const char *vers;
         const u32 *psrc;
 
-        /* This code assumes that a non-NULL device node is passed in */
-        BUG_ON(!node);
+        /* Default MPIC search parameters */
+        static const struct of_device_id __initconst mpic_device_id[] = {
+                { .type       = "open-pic", },
+                { .compatible = "open-pic", },
+                {},
+        };
+
+        /*
+         * If we were not passed a device-tree node, then perform the default
+         * search for standardized a standardized OpenPIC.
+         */
+        if (node) {
+                node = of_node_get(node);
+        } else {
+                node = of_find_matching_node(NULL, mpic_device_id);
+                if (!node)
+                        return NULL;
+        }
 
         /* Pick the physical address from the device tree if unspecified */
         if (!phys_addr) {
@@ -1154,14 +1170,14 @@ struct mpic * __init mpic_alloc(struct device_node *node,
                 } else {
                         struct resource r;
                         if (of_address_to_resource(node, 0, &r))
-                                return NULL;
+                                goto err_of_node_put;
                         phys_addr = r.start;
                 }
         }
 
         mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
         if (mpic == NULL)
-                return NULL;
+                goto err_of_node_put;
 
         mpic->name = name;
         mpic->paddr = phys_addr;
@@ -1325,6 +1341,11 @@ struct mpic * __init mpic_alloc(struct device_node *node,
                                        isu_size ? isu_size : mpic->num_sources,
                                        &mpic_host_ops,
                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
+
+        /*
+         * FIXME: The code leaks the MPIC object and mappings here; this
+         * is very unlikely to fail but it ought to be fixed anyways.
+         */
         if (mpic->irqhost == NULL)
                 return NULL;
 
@@ -1359,7 +1380,12 @@ struct mpic * __init mpic_alloc(struct device_node *node,
                 irq_set_default_host(mpic->irqhost);
         }
 
+        of_node_put(node);
         return mpic;
+
+err_of_node_put:
+        of_node_put(node);
+        return NULL;
 }
 
 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,