This includes walking the parent nodes if necessary.
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
arch/powerpc/include/asm/prom.h | 2 ++
arch/powerpc/kernel/prom.c | 26 ++++++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index bc2da15..3bac73e 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -58,6 +58,8 @@ static inline int of_node_to_nid(struct device_node *device)
{ return 0; }
extern void of_instantiate_rtc(void);
+extern int of_get_ibm_chip_id(struct device_node *np);
+
/* The of_drconf_cell struct defines the layout of the LMB array
* specified in the device tree property
* ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index eb23ac9..2de07e5 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -795,6 +795,32 @@ struct device_node *of_find_next_cache_node(struct
device_node *np)
return NULL;
}
+/**
+ * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
+ * @np: device node of the device
+ *
+ * This looks for a property "ibm,chip-id" in the node or any
+ * of its parents and returns its content, or -1 if it cannot
+ * be found.
+ */
+int of_get_ibm_chip_id(struct device_node *np)
+{
+ of_node_get(np);
+ while(np) {
+ struct device_node *old = np;
+ const __be32 *prop;
+
+ prop = of_get_property(np, "ibm,chip-id", NULL);
+ if (prop) {
+ of_node_put(np);
+ return be32_to_cpup(prop);
+ }
+ np = of_get_parent(np);
+ of_node_put(old);
+ }
+ return -1;
+}
+
#ifdef CONFIG_PPC_PSERIES
/*
* Fix up the uninitialized fields in a new device node:
--
1.8.1.2
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