diff --git a/arch/arm/cpu/armv7/uniphier/Kconfig b/arch/arm/cpu/armv7/uniphier/Kconfig
index 524b193e58efb94d762b326e814898bc921a2b91..f013dc3cadd3d2f139c5f1ae2ecaa4bdf95c60a1 100644
--- a/arch/arm/cpu/armv7/uniphier/Kconfig
+++ b/arch/arm/cpu/armv7/uniphier/Kconfig
@@ -23,4 +23,13 @@ config MACH_PH1_SLD8
 
 endchoice
 
+config CMD_PINMON
+	bool "Enable boot mode pins monitor command"
+	depends on !SPL_BUILD
+	default y
+	help
+	  The command "pinmon" shows the state of the boot mode pins.
+	  The boot mode pins are latched when the system reset is deasserted
+	  and determine which device the system should load a boot image from.
+
 endmenu
diff --git a/arch/arm/cpu/armv7/uniphier/Makefile b/arch/arm/cpu/armv7/uniphier/Makefile
index 7cedddaadc7acca7d64f67cf86740398e234f2d1..dd57469d9c5d1a31321eb586b6199e5990f5ea60 100644
--- a/arch/arm/cpu/armv7/uniphier/Makefile
+++ b/arch/arm/cpu/armv7/uniphier/Makefile
@@ -12,7 +12,7 @@ obj-y += dram_init.o
 obj-$(CONFIG_DISPLAY_CPUINFO) += cpu_info.o
 obj-$(CONFIG_BOARD_LATE_INIT) += board_late_init.o
 obj-$(CONFIG_UNIPHIER_SMP) += smp.o
-obj-$(if $(CONFIG_SPL_BUILD),,y) += cmd_pinmon.o
+obj-$(CONFIG_CMD_PINMON) += cmd_pinmon.o
 
 obj-y += board_common.o
 obj-$(CONFIG_PFC_MICRO_SUPPORT_CARD) += support_card.o
diff --git a/drivers/serial/serial_uniphier.c b/drivers/serial/serial_uniphier.c
index 9114b3ed6002a1a0d9e3c6303ad07993060b07f9..3f3d4152134af0a1706535e0b11e21849442ef84 100644
--- a/drivers/serial/serial_uniphier.c
+++ b/drivers/serial/serial_uniphier.c
@@ -55,7 +55,7 @@ struct uniphier_serial_private_data {
 #define uniphier_serial_port(dev)	\
 	((struct uniphier_serial_private_data *)dev_get_priv(dev))->membase
 
-int uniphier_serial_setbrg(struct udevice *dev, int baudrate)
+static int uniphier_serial_setbrg(struct udevice *dev, int baudrate)
 {
 	struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
 	struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
@@ -93,7 +93,17 @@ static int uniphier_serial_putc(struct udevice *dev, const char c)
 	return 0;
 }
 
-int uniphier_serial_probe(struct udevice *dev)
+static int uniphier_serial_pending(struct udevice *dev, bool input)
+{
+	struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
+
+	if (input)
+		return readb(&port->lsr) & UART_LSR_DR;
+	else
+		return !(readb(&port->lsr) & UART_LSR_THRE);
+}
+
+static int uniphier_serial_probe(struct udevice *dev)
 {
 	struct uniphier_serial_private_data *priv = dev_get_priv(dev);
 	struct uniphier_serial_platform_data *plat = dev_get_platdata(dev);
@@ -106,7 +116,7 @@ int uniphier_serial_probe(struct udevice *dev)
 	return 0;
 }
 
-int uniphier_serial_remove(struct udevice *dev)
+static int uniphier_serial_remove(struct udevice *dev)
 {
 	unmap_sysmem(uniphier_serial_port(dev));
 
@@ -134,6 +144,7 @@ static const struct dm_serial_ops uniphier_serial_ops = {
 	.setbrg = uniphier_serial_setbrg,
 	.getc = uniphier_serial_getc,
 	.putc = uniphier_serial_putc,
+	.pending = uniphier_serial_pending,
 };
 
 U_BOOT_DRIVER(uniphier_serial) = {