SPARC/LEON: avoid AMBAPP name duplicates in openprom fs when REG is missing

When the REG property is not available the NODE-ID is used as an unique
identifier in order to avoid filesystem name duplicates in /proc/openprom
filesystem

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 8 deletions

diff --git a/arch/sparc/kernel/prom_32.c b/arch/sparc/kernel/prom_32.c
index 0a37e8cfd160..05fb25330583 100644
--- a/arch/sparc/kernel/prom_32.c
+++ b/arch/sparc/kernel/prom_32.c
@@ -136,18 +136,29 @@ static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 /* "name:vendor:device@irq,addrlo" */
 static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
 {
-        struct amba_prom_registers *regs; unsigned int *intr;
-        unsigned int *device, *vendor;
+        struct amba_prom_registers *regs;
+        unsigned int *intr, *device, *vendor, reg0;
         struct property *prop;
+        int interrupt = 0;
 
+        /* In order to get a unique ID in the device tree (multiple AMBA devices
+         * may have the same name) the node number is printed
+         */
         prop = of_find_property(dp, "reg", NULL);
-        if (!prop)
-                return;
-        regs = prop->value;
+        if (!prop) {
+                reg0 = (unsigned int)dp->phandle;
+        } else {
+                regs = prop->value;
+                reg0 = regs->phys_addr;
+        }
+
+        /* Not all cores have Interrupt */
         prop = of_find_property(dp, "interrupts", NULL);
         if (!prop)
-                return;
-        intr = prop->value;
+                intr = &interrupt; /* IRQ0 does not exist */
+        else
+                intr = prop->value;
+
         prop = of_find_property(dp, "vendor", NULL);
         if (!prop)
                 return;
@@ -159,7 +170,7 @@ static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
 
         sprintf(tmp_buf, "%s:%d:%d@%x,%x",
                 dp->name, *vendor, *device,
-                *intr, regs->phys_addr);
+                *intr, reg0);
 }
 
 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)