Allow the ns16550 debug UART to be used without the full driver.

Signed-off-by: Simon Glass <s...@chromium.org>
---

 drivers/serial/ns16550.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 3fab3f1..2025423 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -440,6 +440,7 @@ static const struct udevice_id ns16550_serial_ids[] = {
 };
 #endif
 
+#if CONFIG_IS_ENABLED(SERIAL_PRESENT)
 U_BOOT_DRIVER(ns16550_serial) = {
        .name   = "ns16550_serial",
        .id     = UCLASS_SERIAL,
@@ -453,4 +454,5 @@ U_BOOT_DRIVER(ns16550_serial) = {
        .ops    = &ns16550_serial_ops,
        .flags  = DM_FLAG_PRE_RELOC,
 };
+#endif
 #endif /* CONFIG_DM_SERIAL */
-- 
2.6.0.rc2.230.g3dd15c0

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