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SubjectRe: [PATCH] serdev: Don't claim unsupported serial devices
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@vger.kernel.org
> Signed-off-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Johan Hovold <johan@kernel.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> ---
>
> 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

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