diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c
index eec86639cac4fe8fc2842dd9457807f7e2359c6a..d64a7fc71df822f8b53845bab0ba9392a54a28f3 100644
--- a/drivers/base/regmap/regmap-mmio.c
+++ b/drivers/base/regmap/regmap-mmio.c
@@ -128,7 +128,7 @@ static struct regmap_bus regmap_mmio = {
 	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
 };
 
-struct regmap_mmio_context *regmap_mmio_gen_context(void __iomem *regs,
+static struct regmap_mmio_context *regmap_mmio_gen_context(void __iomem *regs,
 					const struct regmap_config *config)
 {
 	struct regmap_mmio_context *ctx;