fdt: Add a function to decode a variable-sized u32 array

Sometimes an array can be of variable size up to a maximum. Add a helper
function to decode this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-11-10 18:00:19 -07:00
parent 768e0f52f2
commit a9f04d49e5
2 changed files with 36 additions and 0 deletions

View file

@ -444,6 +444,22 @@ int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
u32 *array, int count);
/**
* Look up a property in a node and return its contents in an integer
* array of given length. The property must exist but may have less data that
* expected (4*count bytes). It may have more, but this will be ignored.
*
* @param blob FDT blob
* @param node node to examine
* @param prop_name name of property to find
* @param array array to fill with data
* @param count number of array elements
* @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the
* property is not found
*/
int fdtdec_get_int_array_count(const void *blob, int node,
const char *prop_name, u32 *array, int count);
/**
* Look up a property in a node and return a pointer to its contents as a
* unsigned int array of given length. The property must have at least enough

View file

@ -485,6 +485,26 @@ int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
return err;
}
int fdtdec_get_int_array_count(const void *blob, int node,
const char *prop_name, u32 *array, int count)
{
const u32 *cell;
int len, elems;
int i;
debug("%s: %s\n", __func__, prop_name);
cell = fdt_getprop(blob, node, prop_name, &len);
if (!cell)
return -FDT_ERR_NOTFOUND;
elems = len / sizeof(u32);
if (count > elems)
count = elems;
for (i = 0; i < count; i++)
array[i] = fdt32_to_cpu(cell[i]);
return count;
}
const u32 *fdtdec_locate_array(const void *blob, int node,
const char *prop_name, int count)
{