[U-Boot] "best practice" for including common header file content?

more excruciatingly pedantic queries ... what is the best practice for header files under include/configs including common header files also in that same directory. i give you:

$ git grep zynq-common.h bitmain_antminer_s9.h:#include <configs/zynq-common.h> syzygy_hub.h: * See zynq-common.h for Zynq common configs syzygy_hub.h:#include <configs/zynq-common.h> topic_miami.h: * See zynq-common.h for Zynq common configs topic_miami.h:#include "zynq-common.h" zynq_cse.h: * See zynq-common.h for Zynq common configs zynq_cse.h:#include <configs/zynq-common.h> $

so some of them include "zynq-common.h", while others include <configs/zynq-common.h>. naturally, both work -- does u-boot have a stylistic preference?

rday