Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 53 insertions, 0 deletions

diff --git a/roms/u-boot/drivers/serial/serial_nulldev.c b/roms/u-boot/drivers/serial/serial_nulldev.c
new file mode 100644
index 000000000..efae14dd6
--- /dev/null
+++ b/roms/u-boot/drivers/serial/serial_nulldev.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2015 National Instruments
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <serial.h>
+
+static int nulldev_serial_setbrg(struct udevice *dev, int baudrate)
+{
+	return 0;
+}
+
+static int nulldev_serial_getc(struct udevice *dev)
+{
+	return -EAGAIN;
+}
+
+static int nulldev_serial_pending(struct udevice *dev, bool input)
+{
+	return 0;
+}
+
+static int nulldev_serial_input(struct udevice *dev)
+{
+	return 0;
+}
+
+static int nulldev_serial_putc(struct udevice *dev, const char ch)
+{
+	return 0;
+}
+
+static const struct udevice_id nulldev_serial_ids[] = {
+	{ .compatible = "nulldev-serial" },
+	{ }
+};
+
+
+const struct dm_serial_ops nulldev_serial_ops = {
+	.putc = nulldev_serial_putc,
+	.pending = nulldev_serial_pending,
+	.getc = nulldev_serial_getc,
+	.setbrg = nulldev_serial_setbrg,
+};
+
+U_BOOT_DRIVER(serial_nulldev) = {
+	.name	= "serial_nulldev",
+	.id	= UCLASS_SERIAL,
+	.of_match = nulldev_serial_ids,
+	.ops	= &nulldev_serial_ops,
+};