[RFC v2 0/5] tty/serial/8250: add MCTRL_GPIO support

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From: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>

This series adds MCTRL_GPIO support to 8250 driver. In order to do so
following changes had to be made:

* read/write calls to MCR register were put into new routines:
serial8250_out_MCR() and serial8250_in_MCR(). These new routines
now access both UARTs MCR register as also read/write GPIO pins
for RTS/DTR/OUT1/OUT2

* MCTRL_GPIO framwork had routines to set MCR and to read MSR, reading
MCR related GPIO signals was missing, hence mctrl_gpio_get_outputs()
routine was implemented

* RS485 half-duplex was missing RX activation after TX

* mctrl_gpio_irq_handle() got IRQ locking

Yegor Yefremov (5):
  tty/serial/8250: fix RS485 half-duplex RX
  tty/serial/8250: make UART_MCR register access consistent
  serial: mctrl_gpio: add modem control read routine
  serial: mctrl_gpio: add IRQ locking
  tty/serial/8250: use mctrl_gpio helpers

 Documentation/devicetree/bindings/serial/8250.txt | 19 +++++++
 drivers/tty/serial/8250/8250.h                    | 51 ++++++++++++++++++
 drivers/tty/serial/8250/8250_core.c               |  4 ++
 drivers/tty/serial/8250/8250_omap.c               | 35 ++++++------
 drivers/tty/serial/8250/8250_port.c               | 65 ++++++++++++++---------
 drivers/tty/serial/8250/Kconfig                   |  1 +
 drivers/tty/serial/serial_mctrl_gpio.c            | 23 ++++++++
 drivers/tty/serial/serial_mctrl_gpio.h            | 15 +++++-
 include/linux/serial_8250.h                       |  1 +
 9 files changed, 172 insertions(+), 42 deletions(-)

-- 
2.1.4

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