diff -rupN linux.orig/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi linux/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
--- linux.orig/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi	2023-09-12 12:02:56.937601871 +0000
+++ linux/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi	2023-09-12 12:03:27.490291628 +0000
@@ -1903,6 +1891,15 @@
 						};
 					};
 
+					uart_ao_b_pins: uart-b-ao {
+						mux {
+							groups = "uart_ao_b_tx_8",
+								 "uart_ao_b_rx_9";
+							function = "uart_ao_b";
+							bias-disable;
+						};
+					};
+
 					uart_ao_a_pins: uart-a-ao {
 						mux {
 							groups = "uart_ao_a_tx",