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Add helper method fdt_find_child to make access to child nodes easier.

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Some FDT nodes have complex properties organized as a child sub-nodes
(e.g. timing for LCD panel) we need easy way to obtain handles for
these sub-nodes
This commit is contained in:
gonzo 2015-05-22 02:00:44 +00:00
parent d4a944133d
commit 721376a5c9
2 changed files with 18 additions and 0 deletions
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17
sys/dev/fdt/fdt_common.c
View File

@ -57,6 +57,7 @@ __FBSDID("$FreeBSD$");
#define FDT_COMPAT_LEN 255
#define FDT_TYPE_LEN 64
#define FDT_NAME_LEN 32
#define FDT_REG_CELLS 4
@ -309,6 +310,22 @@ fdt_find_compatible(phandle_t start, const char *compat, int strict)
return (0);
}
phandle_t
fdt_find_child(phandle_t start, const char *child_name)
{
char name[FDT_NAME_LEN];
phandle_t child;
for (child = OF_child(start); child != 0; child = OF_peer(child)) {
if (OF_getprop(child, "name", name, sizeof(name)) <= 0)
continue;
if (strcmp(name, child_name) == 0)
return (child);
}
return (0);
}
phandle_t
fdt_depth_search_compatible(phandle_t start, const char *compat, int strict)
{

1
sys/dev/fdt/fdt_common.h
View File

@ -81,6 +81,7 @@ u_long fdt_data_get(void *, int);
int fdt_data_to_res(pcell_t *, int, int, u_long *, u_long *);
phandle_t fdt_find_compatible(phandle_t, const char *, int);
phandle_t fdt_depth_search_compatible(phandle_t, const char *, int);
phandle_t fdt_find_child(phandle_t, const char *);
int fdt_get_mem_regions(struct mem_region *, int *, uint32_t *);
int fdt_get_reserved_regions(struct mem_region *, int *);
int fdt_get_phyaddr(phandle_t, device_t, int *, void **);