On Wed, May 28, 2014 at 12:45:50PM -0700, Greg Kroah-Hartman wrote:
> On Tue, May 13, 2014 at 08:20:43PM +0200, Richard Genoud wrote:
> > This patch add some helpers to control modem lines (CTS/RTS/DSR...) via
> > GPIO.
> > This will be useful for many boards which have a serial controller that
> > only handle CTS/RTS pins (or even just RX/TX).
> >
> > Signed-off-by: Richard Genoud <richard.genoud@xxxxxxxxx>
> > Tested-by: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>
> > ---
> > Documentation/serial/driver | 25 ++++++
> > drivers/tty/serial/Kconfig | 3 +
> > drivers/tty/serial/Makefile | 3 +
> > drivers/tty/serial/serial_mctrl_gpio.c | 143 ++++++++++++++++++++++++++++++++
> > drivers/tty/serial/serial_mctrl_gpio.h | 110 ++++++++++++++++++++++++
> > 5 files changed, 284 insertions(+)
> > create mode 100644 drivers/tty/serial/serial_mctrl_gpio.c
> > create mode 100644 drivers/tty/serial/serial_mctrl_gpio.h
> >
> > diff --git a/Documentation/serial/driver b/Documentation/serial/driver
> > index c3a7689..3bba1ae 100644
> > --- a/Documentation/serial/driver
> > +++ b/Documentation/serial/driver
> > @@ -429,3 +429,28 @@ thus:
> > struct uart_port port;
> > int my_stuff;
> > };
> > +
> > +Modem control lines via GPIO
> > +----------------------------
> > +
> > +Some helpers are provided in order to set/get modem control lines via GPIO.
> > +
> > +mctrl_gpio_init(dev, idx):
> > + This will get the {cts,rts,...}-gpios from device tree if they are
> > + present and request them, set direction etc, and return an
> > + allocated structure. devm_* functions are used, so there's no need
> > + to call mctrl_gpio_free().
> > +
> > +mctrl_gpio_free(dev, gpios):
> > + This will free the requested gpios in mctrl_gpio_init().
> > + As devm_* function are used, there's generally no need to call
> > + this function.
> > +
> > +mctrl_gpio_to_gpiod(gpios, gidx)
> > + This returns the gpio structure associated to the modem line index.
> > +
> > +mctrl_gpio_set(gpios, mctrl):
> > + This will sets the gpios according to the mctrl state.
> > +
> > +mctrl_gpio_get(gpios, mctrl):
> > + This will update mctrl with the gpios values.
> > diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> > index 5d9b01a..95afd31 100644
> > --- a/drivers/tty/serial/Kconfig
> > +++ b/drivers/tty/serial/Kconfig
> > @@ -1510,4 +1510,7 @@ config SERIAL_ST_ASC_CONSOLE
> >
> > endmenu
> >
> > +config SERIAL_MCTRL_GPIO
> > + tristate
>
> Why is this added here? Who is going to use it?
Ah, the next patch does, nevermind...
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