Index: mvclock.c
===================================================================
RCS file: /cvs/src/sys/dev/fdt/mvclock.c,v
retrieving revision 1.12
diff -u -p -r1.12 mvclock.c
--- mvclock.c	17 May 2022 10:09:40 -0000	1.12
+++ mvclock.c	4 Jun 2022 09:58:37 -0000
@@ -354,7 +354,22 @@ a3700_periph_sb_enable(void *cookie, uin
 uint32_t
 a3700_periph_sb_get_frequency(void *cookie, uint32_t *cells)
 {
+	struct mvclock_softc *sc = cookie;
 	uint32_t idx = cells[0];
+	uint32_t freq;
+
+	switch (idx) {
+	case PERIPH_SB_GBE1_CORE:
+		freq = a3700_periph_tbg_get_frequency(sc, 4);
+		freq /= a3700_periph_get_div(sc, PERIPH_DIV_SEL1, 13) + 1;
+		return freq;
+	case PERIPH_SB_GBE0_CORE:
+		freq = a3700_periph_tbg_get_frequency(sc, 5);
+		freq /= a3700_periph_get_div(sc, PERIPH_DIV_SEL1, 14) + 1;
+		return freq;
+	default:
+		break;
+	}
 
 	printf("%s: 0x%08x\n", __func__, idx);
 	return 0;