docs: add a note to mck_io_num: for esp32, only gpio0/gpio1/gpio3 can be set
@@ -78,7 +78,7 @@ typedef struct {
*
*/
typedef struct {
- int mck_io_num; /*!< MCK in out pin*/
+ int mck_io_num; /*!< MCK in out pin. Note that ESP32 supports setting MCK on GPIO0/GPIO1/GPIO3 only*/
int bck_io_num; /*!< BCK in out pin*/
int ws_io_num; /*!< WS in out pin*/
int data_out_num; /*!< DATA out pin*/
