Many drivers currently do:
   switch (cflag & CSIZE) {
   case CS5:
           lcr = UART_LCR_WLEN5;
           break;
   case CS6:
           lcr = UART_LCR_WLEN6;
           break;
   case CS7:
           lcr = UART_LCR_WLEN7;
           break;
   default:
   case CS8:
           lcr = UART_LCR_WLEN8;
           break;
   }

We can simplify it to:
   lcr = UART_LCR_WLEN(tty_get_char_size(cflag));
if we define UART_LCR_WLEN() properly first.

So UART_LCR_WLEN is defined in this series and all such drivers are
converted too.

We could go even further: to define something like uart_compute_LCR()
and compute there whole LCR based even on parity+stop fields in cflag. I
will try if it is worth it later. But this series on its own drops some
duplicated lines already.

Jiri Slaby (5):
  tty: serial: define UART_LCR_WLEN() macro
  tty: serial: make use of UART_LCR_WLEN() + tty_get_char_size()
  USB: serial: make use of UART_LCR_WLEN() + tty_get_char_size()
  sdio_uart: make use of UART_LCR_WLEN() + tty_get_char_size()
  mxser: make use of UART_LCR_WLEN() + tty_get_char_size()

 drivers/mmc/core/sdio_uart.c        | 16 +---------------
 drivers/tty/mxser.c                 | 16 +---------------
 drivers/tty/serial/8250/8250_omap.c | 16 +---------------
 drivers/tty/serial/8250/8250_port.c | 16 +---------------
 drivers/tty/serial/jsm/jsm_cls.c    | 16 +---------------
 drivers/tty/serial/jsm/jsm_neo.c    | 16 +---------------
 drivers/tty/serial/omap-serial.c    | 16 +---------------
 drivers/tty/serial/pxa.c            | 16 +---------------
 drivers/tty/serial/serial-tegra.c   | 22 ++++------------------
 drivers/tty/serial/vr41xx_siu.c     | 15 +--------------
 drivers/usb/serial/ark3116.c        | 17 ++---------------
 drivers/usb/serial/f81232.c         | 16 +---------------
 drivers/usb/serial/f81534.c         | 16 +---------------
 drivers/usb/serial/mos7720.c        | 20 +-------------------
 drivers/usb/serial/quatech2.c       | 16 +---------------
 drivers/usb/serial/ssu100.c         | 16 +---------------
 include/uapi/linux/serial_reg.h     |  1 +
 17 files changed, 21 insertions(+), 246 deletions(-)

-- 
2.35.1