+/**
+ * helper function to find the first i2c bus containing devname starting from
+ * i2c-n where n is startfrom
+ *
+ * @param device name to match
+ * @param i2c-dev number to start search from
+ * @return the matching i2c-dev bus id or -1
+ */
+int mraa_find_i2c_bus(const char* devname, int startfrom);
+