[riot-notifications] [RIOT-OS/RIOT] periph/gpio: enable API usage for expanders (#9690)

Gunar Schorcht notifications at github.com
Wed Jan 9 13:28:08 CET 2019

> Do they have to be initialized?

Maybe I missed something. AS I understood, the GPIO_PIN macro should lead to the struct 
typedef struct {
   gpio_ext_t *driver;
   union {
     unsigned pin;
     gpio_cpu_t cpu_pin;
 } gpio_t;
that is used for the API functions `gpio_init` a.s.o. For CPU pins, `driver` has to be `NULL` and `cpu_pin` has to be assigned properly.  For expander pins, the driver has point to the expander device and `pin` has to be assign properly to. 

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