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author | Grant Likely <grant.likely@secretlab.ca> | 2009-11-23 20:06:59 -0700 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2009-11-23 20:06:59 -0700 |
commit | ca900cfa2944448bdb76e1246f282e59bc65f472 (patch) | |
tree | afddd9358f1772cc5467c3c012a0c3e998a3c8c7 /drivers/of | |
parent | 31a6a87dfc34fbf02aef9a160adf558ec56d3ccd (diff) | |
download | linux-ca900cfa2944448bdb76e1246f282e59bc65f472.tar.gz linux-ca900cfa2944448bdb76e1246f282e59bc65f472.tar.bz2 linux-ca900cfa2944448bdb76e1246f282e59bc65f472.zip |
of/flattree: merge of_get_flat_dt_prop
Merge common code between PowerPC and Microblaze
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'drivers/of')
-rw-r--r-- | drivers/of/fdt.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index f41d739aa2f7..b17a9086cbfc 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -99,3 +99,46 @@ unsigned long __init of_get_flat_dt_root(void) return _ALIGN(p + strlen((char *)p) + 1, 4); } +/** + * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr + * + * This function can be used within scan_flattened_dt callback to get + * access to properties + */ +void *__init of_get_flat_dt_prop(unsigned long node, const char *name, + unsigned long *size) +{ + unsigned long p = node; + + do { + u32 tag = *((u32 *)p); + u32 sz, noff; + const char *nstr; + + p += 4; + if (tag == OF_DT_NOP) + continue; + if (tag != OF_DT_PROP) + return NULL; + + sz = *((u32 *)p); + noff = *((u32 *)(p + 4)); + p += 8; + if (initial_boot_params->version < 0x10) + p = _ALIGN(p, sz >= 8 ? 8 : 4); + + nstr = find_flat_dt_string(noff); + if (nstr == NULL) { + pr_warning("Can't find property index name !\n"); + return NULL; + } + if (strcmp(name, nstr) == 0) { + if (size) + *size = sz; + return (void *)p; + } + p += sz; + p = _ALIGN(p, 4); + } while (1); +} + |