diff options
Diffstat (limited to 'Documentation/serial/driver')
| -rw-r--r-- | Documentation/serial/driver | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/Documentation/serial/driver b/Documentation/serial/driver index 067c47d4691..3bba1aeb799 100644 --- a/Documentation/serial/driver +++ b/Documentation/serial/driver @@ -264,10 +264,6 @@ hardware. Locking: none. Interrupts: caller dependent. - set_wake(port,state) - Enable/disable power management wakeup on serial activity. Not - currently implemented. - type(port) Return a pointer to a string constant describing the specified port, or return NULL, in which case the string 'unknown' is @@ -433,3 +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. |