~$ cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 425-511, parent: platform/fe000000.apb4:pinctrl@4000, periphs-b                                                                                                                                                             anks:
 gpio-425 (GPIOA_14            |data_gpio           ) out hi
 gpio-426 (GPIOA_15            |clock_gpio          ) out hi
 gpio-427 (GPIOB_0             )
 gpio-428 (GPIOB_1             )
 gpio-429 (GPIOB_2             )
 gpio-430 (GPIOB_3             )
 gpio-431 (GPIOB_4             )
 gpio-432 (GPIOB_5             )
 gpio-433 (GPIOB_6             )
 gpio-434 (GPIOB_7             )
 gpio-435 (GPIOB_8             )
 gpio-436 (GPIOB_9             )
 gpio-437 (GPIOB_10            )
 gpio-438 (GPIOB_11            )
 gpio-439 (GPIOB_12            )
 gpio-440 (GPIOB_13            )
 gpio-441 (GPIOB_14            )
 gpio-442 (GPIOB_15            )
 gpio-443 (GPIOC_0             )
 gpio-444 (GPIOC_1             )
 gpio-445 (GPIOC_2             )
 gpio-446 (GPIOC_3             )
 gpio-447 (GPIOC_4             )
 gpio-448 (GPIOC_5             )
 gpio-449 (GPIOC_6             |cd                  ) in  lo
 gpio-450 (GPIOC_7             )
 gpio-451 (GPIOE_0             )
 gpio-452 (GPIOE_1             )
 gpio-453 (GPIOE_2             )
 gpio-454 (GPIOD_0             )
 gpio-455 (GPIOD_1             )
 gpio-456 (GPIOD_2             )
 gpio-457 (GPIOD_3             )
 gpio-458 (GPIOD_4             )
 gpio-459 (GPIOD_5             )
 gpio-460 (GPIOD_6             )
 gpio-461 (GPIOD_7             )
 gpio-462 (GPIOD_8             )
 gpio-463 (GPIOD_9             )
 gpio-464 (GPIOD_10            |stb_gpio            ) out lo
 gpio-465 (GPIOD_11            )
 gpio-466 (GPIOH_0             )
 gpio-467 (GPIOH_1             )
 gpio-468 (GPIOH_2             )
 gpio-469 (GPIOH_3             )
 gpio-470 (GPIOH_4             )
 gpio-471 (GPIOH_5             )
 gpio-472 (GPIOH_6             )
 gpio-473 (GPIOH_7             )
 gpio-474 (GPIOH_8             )
 gpio-475 (GPIOX_0             )
 gpio-476 (GPIOX_1             )
 gpio-477 (GPIOX_2             )
 gpio-478 (GPIOX_3             )
 gpio-479 (GPIOX_4             )
 gpio-480 (GPIOX_5             )
 gpio-481 (GPIOX_6             |sdio_wifi           ) out hi
 gpio-482 (GPIOX_7             |sdio_wifi           ) in  hi
 gpio-483 (GPIOX_8             )
 gpio-484 (GPIOX_9             )
 gpio-485 (GPIOX_10            )
 gpio-486 (GPIOX_11            )
 gpio-487 (GPIOX_12            )
 gpio-488 (GPIOX_13            )
 gpio-489 (GPIOX_14            )
 gpio-490 (GPIOX_15            )
 gpio-491 (GPIOX_16            )
 gpio-492 (GPIOX_17            |bt_rfkill           ) out hi
 gpio-493 (GPIOX_18            )
 gpio-494 (GPIOX_19            |bt_rfkill           ) out hi
 gpio-495 (GPIOZ_0             )
 gpio-496 (GPIOZ_1             )
 gpio-497 (GPIOZ_2             )
 gpio-498 (GPIOZ_3             )
 gpio-499 (GPIOZ_4             )
 gpio-500 (GPIOZ_5             )
 gpio-501 (GPIOZ_6             )
 gpio-502 (GPIOZ_7             )
 gpio-503 (GPIOZ_8             )
 gpio-504 (GPIOZ_9             )
 gpio-505 (GPIOZ_10            )
 gpio-506 (GPIOZ_11            )
 gpio-507 (GPIOZ_12            )
 gpio-508 (GPIOZ_13            )
 gpio-509 (GPIOZ_14            )
 gpio-510 (GPIOZ_15            )
 gpio-511 (GPIO_TEST_N         )