Hello, I posted this message to linix-gpio group about a week ago, but it didn't get any reply so far; thus trying here. I am developing a driver for PCIe-based device that needs to receive external signals through on-board GPIOs. The target platform is Intel-based board running Fedora 34 kernel 5.11.12-300.fc34.x86_64 and has GPIO controller driven by gpio-it87. # gpiodetect gpiochip0 [INT34BB:00] (312 lines) gpiochip1 [gpio_it87] (64 lines) 8 of available 64 lines are connected to a header on the board: # gpioinfo 1 ... line 49: "it87_gp71" unused input active-high line 50: "it87_gp72" unused input active-high line 51: "it87_gp73" unused input active-high line 52: "it87_gp74" unused input active-high line 53: "it87_gp75" unused input active-high line 54: "it87_gp76" unused input active-high line 55: "it87_gp77" unused input active-high ... These lines were verified with logic analyzer and `gpioset 1 nn=0|1` The PCIe device driver defines these lines as: static struct gpiod_lookup_table gpio_it87_gpios = { .dev_id = "gpio_it87", .table = { GPIO_LOOKUP("gpio-it87", 48, "it87_gp70", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio-it87", 49, "it87_gp71", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio-it87", 50, "it87_gp72", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio-it87", 51, "it87_gp73", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio-it87", 52, "it87_gp74", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio-it87", 53, "it87_gp75", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio-it87", 54, "it87_gp76", GPIO_ACTIVE_HIGH), GPIO_LOOKUP("gpio-it87", 55, "it87_gp77", GPIO_ACTIVE_HIGH), {}, }, }; and then adds them to lookup table, eg.: gpiod_add_lookup_table(&gpio_it87_gpios); However, none of those lines seem available struct desc *gpio = gpiod_get(dev, "it87_gp70", GPIOD_IN); Above returns -ENOENT for any of those lines. I believe it is due to incorrct lookup definions in gpio_it87_gpios above, however, I cannot figure out what is wrong there. What am I missing? Thanks, --Alex