fdtdec_locate_array() locates an integer array but does not copy it. This saves the caller having to allocated wasted space.
Access to array elements should be through the fdt32_to_cpu() macro.
Signed-off-by: Simon Glass sjg@chromium.org --- Changes in v2: - Add new fdtdec_locate_array() function
include/fdtdec.h | 19 +++++++++++++++++++ lib/fdtdec.c | 11 +++++++++++ 2 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/include/fdtdec.h b/include/fdtdec.h index 171c628..84f0768 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -272,6 +272,25 @@ 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 a pointer to its contents as a + * unsigned int array of given length. The property must have at least enough + * data for the array ('count' cells). It may have more, but this will be + * ignored. The data is not copied. + * + * Note that you must access elements of the array with fdt32_to_cpu(), + * since the elements will be big endian even on a little endian machine. + * + * @param blob FDT blob + * @param node node to examine + * @param prop_name name of property to find + * @param count number of array elements + * @return pointer to array if found, or NULL if the property is not + * found or there is not enough data + */ +const u32 *fdtdec_locate_array(const void *blob, int node, + const char *prop_name, int count); + +/** * Look up a boolean property in a node and return it. * * A boolean properly is true if present in the device tree and false if not diff --git a/lib/fdtdec.c b/lib/fdtdec.c index bdec1a0..4a5ab71 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -363,6 +363,17 @@ int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, return err; }
+const u32 *fdtdec_locate_array(const void *blob, int node, + const char *prop_name, int count) +{ + const u32 *cell; + int err; + + cell = get_prop_check_min_len(blob, node, prop_name, + sizeof(u32) * count, &err); + return err ? NULL : cell; +} + int fdtdec_get_bool(const void *blob, int node, const char *prop_name) { const s32 *cell;