spi com if almost finished

linux/gpio/LinuxLibgpioIF.h

@@ -40,8 +40,7 @@ private:
 	 * @param gpioId	The GPIO ID of the GPIO to drive.
 	 * @param logiclevel	The logic level to set. O or 1.
 	 */
-	ReturnValue_t driveGpio(gpioId_t gpioId,
-			unsigned int logiclevel);
+	ReturnValue_t driveGpio(gpioId_t gpioId, unsigned int logiclevel);
 
 	/**
 	 * @brief	This function checks if GPIOs are already registered and whether

linux/gpio/gpioDefinitions.h

@@ -11,6 +11,8 @@ enum Direction {
     IN = 0,
     OUT = 1
 };
+
+static constexpr gpioId_t NO_GPIO = -1;
 }
 
 /**