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powerpc/powernv: Add helper to get ibm,chip-id of a node

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This includes walking the parent nodes if necessary.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2013-07-15 13:03:10 +10:00
parent cc0efb57eb
commit b37193b718
2 changed files with 28 additions and 0 deletions
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2
arch/powerpc/include/asm/prom.h
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@ -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

26
arch/powerpc/kernel/prom.c
View File

@ -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: