diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 11c860ea80f6..a90a5462aa72 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -123,7 +123,16 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 
 	/* Get clk rate through clk driver if present */
 	if (!port->uartclk) {
-		info->clk = devm_clk_get_enabled(dev, NULL);
+		struct clk *bus_clk;
+
+		bus_clk = devm_clk_get_optional_enabled(dev, "bus");
+		if (IS_ERR(bus_clk)) {
+			ret = dev_err_probe(dev, PTR_ERR(bus_clk), "failed to get bus clock\n");
+			goto err_pmruntime;
+		}
+
+		/* If the bus clock is required, core clock must be named */
+		info->clk = devm_clk_get_enabled(dev, bus_clk ? "core" : NULL);
 		if (IS_ERR(info->clk)) {
 			ret = dev_err_probe(dev, PTR_ERR(info->clk), "failed to get clock\n");
 			goto err_pmruntime;