diff --git a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
index 895c43c7af9f7e6297f648703daef092e1fec9ee..3f5254eeb47b1e0c00fbe62c0630b2906abb04d8 100644
--- a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi
@@ -1871,6 +1871,7 @@
 				status = "disabled";
 				clocks = <&xtal>, <&clkc CLKID_UART0>, <&xtal>;
 				clock-names = "xtal", "pclk", "baud";
+				fifo-size = <128>;
 			};
 		};
 
diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
index 793d48f723906415f179901a969b444495376423..00c6f53290d438b016af013082d1fd6707ecedaa 100644
--- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
@@ -2317,6 +2317,7 @@
 				clocks = <&xtal>, <&clkc CLKID_UART0>, <&xtal>;
 				clock-names = "xtal", "pclk", "baud";
 				status = "disabled";
+				fifo-size = <128>;
 			};
 		};
 
diff --git a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
index 3d00404aae0f4a981731dc8ddcdb60ccccdc0caa..6b457b2c30a4bc23ff9143a96845c7a2b4d6c330 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi
@@ -301,6 +301,7 @@
 				reg = <0x0 0x84c0 0x0 0x18>;
 				interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>;
 				status = "disabled";
+				fifo-size = <128>;
 			};
 
 			uart_B: serial@84dc {