serial: Add LED trigger support

[Sascha Hauer]

This series brings LED trigger support to the serial_core layer
and adopts some driver to use it.
This is an updated version of https://patchwork.kernel.org/patch/9212885/
which added LED trigger support to the i.MX serial driver only.

Sascha

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Sascha Hauer (4):
      serial: core: Add LED trigger support
      serial: 8250: Add LED trigger support
      serial: cpm_uart: Add LED trigger support
      serial: imx: Add LED trigger support

 drivers/tty/serial/8250/8250_core.c         | 12 ++++-
 drivers/tty/serial/8250/8250_port.c         |  4 ++
 drivers/tty/serial/cpm_uart/cpm_uart_core.c | 22 ++++++++-
 drivers/tty/serial/imx.c                    | 24 +++++++++-
 drivers/tty/serial/serial_core.c            | 73 +++++++++++++++++++++++++++++
 include/linux/serial_core.h                 | 10 ++++
 6 files changed, 139 insertions(+), 6 deletions(-)