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Commit b37193b7 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

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



This includes walking the parent nodes if necessary.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent cc0efb57

arch/powerpc/include/asm/prom.h

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/kernel/prom.c

+26 −0
Original line number Diff line number Diff line
@@ -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: