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serial: smh: Initialize serial only if semihosting is enabled

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If semihosting is disabled, then the user has no debugger attached, and
will not see any messages. Don't create a serial device in this
instance, to (hopefully) fall back on another working serial device.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
This commit is contained in:
Sean Anderson 2022-03-22 16:59:32 -04:00 committed by Tom Rini
parent bbe310cdaf
commit 2332590c48
1 changed files with 10 additions and 1 deletions
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9
drivers/serial/serial_semihosting.c
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@ -41,6 +41,13 @@ static const struct dm_serial_ops smh_serial_ops = {
.getc = smh_serial_getc,
};
static int smh_serial_bind(struct udevice *dev)
{
if (semihosting_enabled())
return 0;
return -ENOENT;
}
static int smh_serial_probe(struct udevice *dev)
{
struct smh_serial_priv *priv = dev_get_priv(dev);
@ -52,6 +59,7 @@ static int smh_serial_probe(struct udevice *dev)
U_BOOT_DRIVER(smh_serial) = {
.name = "serial_semihosting",
.id = UCLASS_SERIAL,
.bind = smh_serial_bind,
.probe = smh_serial_probe,
.priv_auto = sizeof(struct smh_serial_priv),
.ops = &smh_serial_ops,
@ -122,6 +130,7 @@ struct serial_device serial_smh_device = {
void smh_serial_initialize(void)
{
if (semihosting_enabled())
serial_register(&serial_smh_device);
}