diff --git a/src/soc/mediatek/common/uart.c b/src/soc/mediatek/common/uart.c
index 20ec8766c4..8905c55528 100644
--- a/src/soc/mediatek/common/uart.c
+++ b/src/soc/mediatek/common/uart.c
@@ -20,6 +20,7 @@
 #include <stdint.h>
 
 #include <soc/addressmap.h>
+#include <soc/pll.h>
 
 struct mtk_uart {
 	union {
@@ -84,7 +85,7 @@ static int mtk_uart_tst_byte(void);
 static void mtk_uart_init(void)
 {
 	/* Use a hardcoded divisor for now. */
-	const unsigned int uartclk = 26 * MHz;
+	const unsigned int uartclk = UART_HZ;
 	const unsigned int baudrate = get_uart_baudrate();
 	const uint8_t line_config = UART8250_LCR_WLS_8;  /* 8n1 */
 	unsigned int highspeed, quot, divisor, remainder;
@@ -177,6 +178,7 @@ void uart_fill_lb(void *data)
 	struct lb_serial serial;
 	serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
 	serial.baseaddr = UART0_BASE;
+	serial.input_hertz = UART_HZ;
 	serial.baud = get_uart_baudrate();
 	serial.regwidth = 4;
 	lb_add_serial(&serial, data);
diff --git a/src/soc/mediatek/mt8183/include/soc/pll.h b/src/soc/mediatek/mt8183/include/soc/pll.h
index 3807e0087e..5a24e75692 100644
--- a/src/soc/mediatek/mt8183/include/soc/pll.h
+++ b/src/soc/mediatek/mt8183/include/soc/pll.h
@@ -268,6 +268,7 @@ enum {
 /* top_mux rate */
 enum {
 	SPI_HZ		= MAINPLL_D5_D2_HZ,
+	UART_HZ		= CLK26M_HZ,
 };
 
 enum {