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dt: add of_alias_scan and of_alias_get_id

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The patch adds function of_alias_scan to populate a global lookup
table with the properties of 'aliases' node and function
of_alias_get_id for drivers to find alias id from the lookup table.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
[grant.likely: add locking and rework parse loop]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Shawn Guo
2011-08-03 11:28:14 +01:00
committed by Grant Likely
parent ed8f37370d
commit 750f463a74
4 changed files with 141 additions and 2 deletions
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8
include/linux/of.h
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@ -68,6 +68,7 @@ struct device_node {
/* Pointer for first entry in chain of all nodes. */
extern struct device_node *allnodes;
extern struct device_node *of_chosen;
extern struct device_node *of_aliases;
extern rwlock_t devtree_lock;
static inline bool of_have_populated_dt(void)
@ -209,6 +210,9 @@ extern int of_device_is_available(const struct device_node *device);
extern const void *of_get_property(const struct device_node *node,
const char *name,
int *lenp);
#define for_each_property(pp, properties) \
for (pp = properties; pp != NULL; pp = pp->next)
extern int of_n_addr_cells(struct device_node *np);
extern int of_n_size_cells(struct device_node *np);
extern const struct of_device_id *of_match_node(
@ -221,6 +225,10 @@ extern int of_parse_phandles_with_args(struct device_node *np,
const char *list_name, const char *cells_name, int index,
struct device_node **out_node, const void **out_args);
extern void *early_init_dt_alloc_memory_arch(u64 size, u64 align);
extern void of_alias_scan(void);
extern int of_alias_get_id(struct device_node *np, const char *stem);
extern int of_machine_is_compatible(const char *compat);
extern int prom_add_property(struct device_node* np, struct property* prop);