Our customized carrier board use 4 x gpio, two of which are occupied,but I did not use these GPIOs for other functions.
Calculate the GPIO number from the Pinmux table
GPIO4- 290; GPIO5 -503;GPIO20 -291;GPIO21-288
gpiochip2: GPIOs 240-247, parent: platform/max77620-gpio, max77620-gpio, can sleep:
gpio-246 ( |gpio_default ) out hi
gpio-247 ( |gpio_default ) out hi
gpiochip1: GPIOs 248-287, parent: platform/c2f0000.gpio, tegra-gpio-aon:
gpio-248 (CAN1_DOUT )
gpio-249 (CAN1_DIN )
gpio-250 (CAN0_DOUT )
gpio-251 (CAN0_DIN )
gpio-252 ( )
gpio-253 ( |usb-p9-0-5v0 ) out lo
gpio-254 ( |fairchild,vbus5v ) out lo
gpio-255 ( )
gpio-256 (GPIO8 |vdd-1v8-sd ) out hi
gpio-257 (GPIO9 |enable_gpio_patch ) out hi
gpio-258 ( |vdd-hdmi-p2-5v0 ) out hi
gpio-259 ( )
gpio-260 ( )
gpio-261 ( )
gpio-262 ( )
gpio-263 ( )
gpio-264 ( )
gpio-265 ( )
gpio-266 ( )
gpio-267 ( )
gpio-268 ( )
gpio-269 ( )
gpio-270 ( )
gpio-271 (I2C2_CLK )
gpio-272 (I2C2_DAT )
gpio-273 ( )
gpio-274 ( )
gpio-275 ( )
gpio-276 ( )
gpio-277 ( )
gpio-284 ( |power-key ) in hi
gpiochip0: GPIOs 288-511, parent: platform/2200000.gpio, tegra-gpio:
gpio-288 ( )
gpio-289 ( |vdd-12v-pcie ) out hi
gpio-290 ( )
gpio-291 ( |vdd-hdmi-p1-5v0 ) out lo
gpio-292 ( )
gpio-293 ( )
gpio-294 ( )
gpio-295 ( )
gpio-296 ( )
gpio-297 ( )
gpio-298 ( )
gpio-299 ( )
gpio-300 ( )
gpio-301 ( )
gpio-302 ( )
gpio-303 ( )
gpio-304 ( )
gpio-305 ( )
gpio-306 ( )
gpio-307 ( )
gpio-308 ( )
gpio-309 ( )
gpio-310 ( )
gpio-311 ( )
gpio-312 ( )
gpio-313 ( )
gpio-314 ( )
gpio-315 ( )
gpio-316 ( )
gpio-317 ( )
gpio-318 ( )
gpio-319 ( )
gpio-320 ( )
gpio-321 ( )
gpio-322 ( )
gpio-323 ( )
gpio-324 ( )
gpio-325 ( )
gpio-326 ( )
gpio-327 ( )
gpio-328 ( )
gpio-329 ( )
gpio-330 ( )
gpio-331 ( )
gpio-332 ( )
gpio-333 ( )
gpio-334 ( )
gpio-335 ( )
gpio-336 ( |force-recovery ) in hi
gpio-337 ( )
gpio-338 ( |DP0-HPD-CTL ) out lo
gpio-339 ( |wifi-enable ) out hi
gpio-340 ( )
gpio-341 ( |eqos_phy_reset ) out hi
gpio-342 ( )
gpio-343 ( |cd ) in lo
gpio-344 (GPIO35 )
gpio-345 ( )
gpio-346 ( |temp-alert ) in hi
gpio-347 ( )
gpio-348 ( )
gpio-349 ( )
gpio-350 ( )
gpio-351 (I2S2_CLK )
gpio-352 (I2S2_DOUT )
gpio-353 (I2S2_DIN )
gpio-354 (I2S2_FS )
gpio-355 ( )
gpio-356 ( )
gpio-357 ( )
gpio-358 ( )
gpio-359 ( )
gpio-360 ( )
gpio-361 ( )
gpio-362 ( )
gpio-363 ( )
gpio-364 ( )
gpio-365 ( )
gpio-366 ( )
gpio-367 ( )
gpio-368 ( )
gpio-369 ( )
gpio-370 ( )
gpio-371 ( )
gpio-372 ( )
gpio-373 ( )
gpio-374 ( )
gpio-375 ( )
gpio-376 ( )
gpio-377 ( )
gpio-378 ( |pcie_wake ) in hi
gpio-379 ( )
gpio-380 ( )
gpio-381 ( )
gpio-382 ( )
gpio-383 ( )
gpio-384 ( )
gpio-385 ( |hdmi2.0_hpd ) in hi
gpio-386 ( |hdmi2.0_hpd ) in lo
gpio-387 ( )
gpio-388 ( )
gpio-389 ( |vdd_sys_en ) out lo
gpio-390 ( |reset_gpio ) out lo
gpio-391 ( |bt_ext_wake ) out hi
gpio-392 ( |avdd-cam-2v8 ) out lo
gpio-393 ( )
gpio-394 ( )
gpio-395 ( )
gpio-396 ( )
gpio-397 ( )
gpio-398 ( )
gpio-399 ( )
gpio-400 ( )
gpio-401 ( )
gpio-402 ( )
gpio-403 ( )
gpio-404 ( )
gpio-405 ( )
gpio-406 ( )
gpio-407 ( )
gpio-408 ( )
gpio-409 ( )
gpio-410 ( )
gpio-411 ( )
gpio-412 (GPIO32 )
gpio-413 ( )
gpio-414 ( )
gpio-415 ( )
gpio-416 ( )
gpio-417 (GPIO17 |fairchild,int_n ) in hi
gpio-418 ( )
gpio-419 ( )
gpio-420 ( |cc-switch-gpio ) out hi
gpio-421 ( )
gpio-422 (MCLK05 )
gpio-423 ( |fairchild,vbus5v ) out hi
gpio-424 ( )
gpio-425 ( )
gpio-426 (UART1_TX )
gpio-427 (UART1_RX )
gpio-428 (UART1_RTS )
gpio-429 (UART1_CTS )
gpio-430 ( )
gpio-431 ( )
gpio-432 ( )
gpio-433 ( )
gpio-434 ( )
gpio-435 ( )
gpio-436 ( )
gpio-437 ( )
gpio-438 ( )
gpio-439 ( )
gpio-440 ( )
gpio-441 ( )
gpio-442 ( )
gpio-443 ( )
gpio-444 ( )
gpio-445 ( )
gpio-446 ( )
gpio-447 ( )
gpio-448 ( )
gpio-449 ( )
gpio-450 ( )
gpio-451 ( )
gpio-452 ( )
gpio-453 ( )
gpio-454 ( )
gpio-455 ( )
gpio-456 ( )
gpio-457 ( )
gpio-458 ( )
gpio-459 ( )
gpio-460 ( )
gpio-461 ( )
gpio-462 ( )
gpio-463 ( )
gpio-464 ( )
gpio-465 ( )
gpio-466 ( )
gpio-467 ( )
gpio-468 ( )
gpio-469 ( )
gpio-470 ( )
gpio-471 ( )
gpio-472 ( )
gpio-473 ( )
gpio-474 ( )
gpio-475 ( )
gpio-476 ( )
gpio-477 ( )
gpio-478 ( )
gpio-479 ( )
gpio-480 ( |bt_host_wake ) in hi
gpio-481 ( )
gpio-482 ( )
gpio-483 (SPI3_CS0_N )
gpio-484 ( )
gpio-485 ( )
gpio-486 ( )
gpio-487 ( )
gpio-488 ( )
gpio-489 ( |fairchild,int_n ) in hi
gpio-490 ( )
gpio-491 (SPI1_CLK )
gpio-492 (SPI1_MISO )
gpio-493 (SPI1_MOSI )
gpio-494 (SPI1_CS0_N )
gpio-495 (SPI1_CS1_N )
gpio-496 ( )
gpio-497 ( )
//p2822_vdd_hdmi_5v0: regulator@112 {
rtso1001_vdd_hdmi_p1_5v0: regulator@112 {
compatible = “regulator-fixed”;
reg = <112>;
//regulator-name = “vdd-hdmi-5v0”;
regulator-name = “vdd-hdmi-p1-5v0”;
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
//gpio = <&tegra_main_gpio TEGRA194_MAIN_GPIO(A, 3) 0>;
//enable-active-high;
};