On Wed, Dec 18, 2019 at 03:56:46PM +0900, Punit Agrawal wrote: > Serdev sub-system claims all serial devices that are not already > enumerated. All ACPI serial devices, right? Surely not all other types of serial devices in the system. And what do you mean by "not already enumerated"? > As a result, no device node is created for serial port on > certain boards such as the Apollo Lake based UP2. This has the > unintended consequence of not being able to raise the login prompt via > serial connection. > > Introduce a blacklist to reject devices that should not be treated as "reject ACPI serial devices" > a serdev device. Add the Intel HS UART peripheral ids to the blacklist > to bring back serial port on SoCs carrying them. > > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Punit Agrawal <punit1.agrawal@xxxxxxxxxxxxx> > Cc: Rob Herring <robh@xxxxxxxxxx> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: Johan Hovold <johan@xxxxxxxxxx> > Cc: Hans de Goede <hdegoede@xxxxxxxxxx> > --- > > Hi, > > The patch has been updated based on feedback recieved on the RFC[0]. > > Please consider merging if there are no objections. > > Thanks, > Punit > > [0] https://www.spinics.net/lists/linux-serial/msg36646.html > > drivers/tty/serdev/core.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c > index 226adeec2aed..0d64fb7d4f36 100644 > --- a/drivers/tty/serdev/core.c > +++ b/drivers/tty/serdev/core.c > @@ -663,6 +663,12 @@ static acpi_status acpi_serdev_register_device(struct serdev_controller *ctrl, > return AE_OK; > } > > +static const struct acpi_device_id serdev_blacklist_devices[] = { s/serdev_blacklist_devices/serdev_blacklist/acpi_devices/ ? This is an acpi-specific thing, not a generic tty thing. thanks, greg k-h
