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fdt: Add fdtdec_get_uint64 to decode a 64-bit value from a property 

It decodes a 64-bit value from a property that is at least 8 bytes long.

Signed-off-by: Che-Liang Chiou <clchiou@chromium.org>

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Che-Liang Chiou 2012-10-25 16:31:05 +00:00 committed by Gerald Van Baren
parent 79289c0b5f
commit aadef0a1bc
2 changed files with 28 additions and 0 deletions
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15
include/fdtdec.h
View File

@ -181,6 +181,21 @@ fdt_addr_t fdtdec_get_addr(const void *blob, int node,
s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
s32 default_val);
/**
* Look up a 64-bit integer property in a node and return it. The property
* must have at least 8 bytes of data (2 cells). The first two cells are
* concatenated to form a 8 bytes value, where the first cell is top half and
* the second cell is bottom half.
*
* @param blob FDT blob
* @param node node to examine
* @param prop_name name of property to find
* @param default_val default value to return if the property is not found
* @return integer value, if found, or default_val if not
*/
uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
uint64_t default_val);
/**
* Checks whether a node is enabled.
* This looks for a 'status' property. If this exists, then returns 1 if

13
lib/fdtdec.c
View File

@ -111,6 +111,19 @@ s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
return default_val;
}
uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
uint64_t default_val)
{
const uint64_t *cell64;
int length;
cell64 = fdt_getprop(blob, node, prop_name, &length);
if (!cell64 || length < sizeof(*cell64))
return default_val;
return fdt64_to_cpu(*cell64);
}
int fdtdec_get_is_enabled(const void *blob, int node)
{
const char *cell;