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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>
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2 changed files with 36 additions and 0 deletions
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@ -444,6 +444,22 @@ int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
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int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
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u32 *array, int count);
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/**
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* Look up a property in a node and return its contents in an integer
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* array of given length. The property must exist but may have less data that
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* expected (4*count bytes). It may have more, but this will be ignored.
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*
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* @param blob FDT blob
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* @param node node to examine
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* @param prop_name name of property to find
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* @param array array to fill with data
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* @param count number of array elements
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* @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the
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* property is not found
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*/
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int fdtdec_get_int_array_count(const void *blob, int node,
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const char *prop_name, u32 *array, int count);
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/**
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* Look up a property in a node and return a pointer to its contents as a
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* unsigned int array of given length. The property must have at least enough
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20
lib/fdtdec.c
20
lib/fdtdec.c
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@ -485,6 +485,26 @@ int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
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return err;
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}
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int fdtdec_get_int_array_count(const void *blob, int node,
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const char *prop_name, u32 *array, int count)
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{
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const u32 *cell;
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int len, elems;
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int i;
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debug("%s: %s\n", __func__, prop_name);
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cell = fdt_getprop(blob, node, prop_name, &len);
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if (!cell)
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return -FDT_ERR_NOTFOUND;
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elems = len / sizeof(u32);
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if (count > elems)
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count = elems;
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for (i = 0; i < count; i++)
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array[i] = fdt32_to_cpu(cell[i]);
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return count;
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}
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const u32 *fdtdec_locate_array(const void *blob, int node,
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const char *prop_name, int count)
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{
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