-uint32_t drv_log_base2(uint32_t value);
-int drv_add_combination(struct driver *drv, uint32_t format, struct format_metadata *metadata,
- uint64_t usage);
-int drv_add_combinations(struct driver *drv, const uint32_t *formats, uint32_t num_formats,
- struct format_metadata *metadata, uint64_t usage);
+void drv_add_combination(struct driver *drv, uint32_t format, struct format_metadata *metadata,
+ uint64_t usage);
+void drv_add_combinations(struct driver *drv, const uint32_t *formats, uint32_t num_formats,
+ struct format_metadata *metadata, uint64_t usage);