diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 3cb8c59a5ff68ebe28518a2e5f4d0acbb23ebc39..1c0210aa2573124d34dc49e8abe28cef78e23730 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -551,6 +551,14 @@ bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
 		cache[idx] = val;
 		break;
 	}
+#ifdef CONFIG_64BIT
+	case 8: {
+		u64 *cache = base;
+
+		cache[idx] = val;
+		break;
+	}
+#endif
 	default:
 		BUG();
 	}
@@ -584,6 +592,13 @@ unsigned int regcache_get_val(struct regmap *map, const void *base,
 
 		return cache[idx];
 	}
+#ifdef CONFIG_64BIT
+	case 8: {
+		const u64 *cache = base;
+
+		return cache[idx];
+	}
+#endif
 	default:
 		BUG();
 	}