Hi, I’m extremely new to this, and I was wondering if someone could explain to me the difference between the “AON” GPIO controller and the “Main” GPIO controller refereed to in tegra186-gpio.h? Is the AON GPIO controller implemented by the P2597 base board and the Main GPIO controller implemented by the P3310 main board, or are those two separate issues that I am mixing up? Thanks.
you could check it via kernel init messages,
$ dmesg | grep gpio [ 0.963925] gpiochip_setup_dev: registered GPIOs 320 to 511 on device: gpiochip0 (tegra-gpio) [ 0.982963] gpiochip_setup_dev: registered GPIOs 256 to 319 on device: gpiochip1 (tegra-gpio-aon) [ 1.126281] gpiochip_setup_dev: registered GPIOs 240 to 255 on device: gpiochip2 (tca9539) [ 1.147492] gpiochip_setup_dev: registered GPIOs 224 to 239 on device: gpiochip3 (tca9539)
suggest you also refer to below kernel sources for GPIO controllers.