serial: mtk: return error value from clk_get_rate()

Pass the return value from clk_get_rate() instead of changing it to
-EINVAL. These return values are either ignored or logged, so it should
make debugging easier in the cases where it is logged.

Reviewed-by: Julien Stephan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: David Lechner <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/serial/serial_mtk.c b/drivers/serial/serial_mtk.c
index 697f5faec1b..d6a7cf488b9 100644
--- a/drivers/serial/serial_mtk.c
+++ b/drivers/serial/serial_mtk.c
@@ -218,7 +218,7 @@ static int mtk_serial_setbrg(struct udevice *dev, int baudrate)
 	if (clk_valid(&priv->clk)) {
 		clk_rate = clk_get_rate(&priv->clk);
 		if (IS_ERR_VALUE(clk_rate) || clk_rate == 0)
-			return -EINVAL;
+			return (int)clk_rate ?: -EINVAL;
 	} else {
 		clk_rate = priv->fixed_clk_rate;
 	}
@@ -290,7 +290,7 @@ static int mtk_serial_of_to_plat(struct udevice *dev)
 		clk_rate = clk_get_rate(&priv->clk);
 		if (IS_ERR_VALUE(clk_rate)) {
 			dev_err(dev, "invalid baud clock\n");
-			return -EINVAL;
+			return clk_rate;
 		}
 	}