Merge tag 'usb-serial-4.21-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git...

Merge tag 'usb-serial-4.21-rc1' of https://git./linux/kernel/git/johan/usb-serial into usb-next

Johan writes:

USB-serial updates for 4.21-rc1

Here are the USB-serial updates for 4.21-rc1, including:

 - support for mos7840 3-port devices
 - improved ftdi baud-rate divisor calculations
 - support for a new class of f81534 devices

Included are also various clean ups and some new pl2303 device ids.

All have been in linux-next with no reported issues.

Signed-off-by: Johan Hovold <johan@kernel.org>
* tag 'usb-serial-4.21-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial:
  USB: serial: pl2303: add ids for Hewlett-Packard HP POS pole displays
  USB: serial: mos7840: remove set but not used variables 'number, serial'
  USB: serial: mos7840: add a product ID for the new product
  USB: serial: mos7840: clean up register handling
  USB: serial: ftdi_sio: use rounding when calculating baud rate divisors
  USB: serial: f81534: fix reading old/new IC config
  USB: serial: mos7840: remove set but not used variables 'st, data1, iflag'
  USB: serial: quatech2: remove set but not used variable 'port_priv'