TX2 GPIO Is not working_gpio_can_stb

Hi , Now I’m trying to use GPIO of the gpio_can_stb but I don’t verfiy gpio_can_stb .

And I checked pin map in this link https://www.jetsonhacks.com/nvidia-jetson-tx2-j21-header-pinout/

and, pinctrl driver is checking.
/kernel/kernel-4.4/drivers/pinctrl/pinctrl-tegra20.c
/kernel/kernel-4.4/drivers/pinctrl/pinctrl-tegra210.c
/kernel/kernel-4.4/drivers/pinctrl/pinctrl-tegra30.c

why gpio_can_stb is not verified???

I did fallowing things.
/***********************************************************************************
root@tegra-ubuntu: cd /sys/class/gpio/
root@tegra-ubuntu: /sys/class/gpio/echo 40 > export
bash:echo :write error : Invalid arqument

***********************************************************************************/
#define TEGRA_AON_GPIO_PORT_AA 5
mttcan@c310000
gpio_can_stb = <&tegra_aon_gpio TEGRA_AON_GPIO(AA, 0) GPIO_ACTIVE_HIGH>;
gpio_can_stb = 5x8 + 0 = 40

mttcan@c320000
gpio_can_stb = <&tegra_aon_gpio TEGRA_AON_GPIO(AA, 6) GPIO_ACTIVE_HIGH>;
gpio_can_stb = 5x8 + 6 = 46

mttcan@c310000 {
status = “okay”;
gpio_can_stb = <&tegra_aon_gpio TEGRA_AON_GPIO(AA, 0) GPIO_ACTIVE_HIGH>;
gpio_can_en = <&tegra_aon_gpio TEGRA_AON_GPIO(AA, 1) GPIO_ACTIVE_HIGH>;
mram-params = <0 16 16 8 8 8 16 16 16>;
tx-config = <8 8 0 64>;
rx-config = <64 64 64>;
};

    mttcan@c320000 {
            status = "okay";
            gpio_can_stb = <&tegra_aon_gpio TEGRA_AON_GPIO(AA, 6) GPIO_ACTIVE_HIGH>;
            gpio_can_en = <&tegra_aon_gpio TEGRA_AON_GPIO(AA, 7) GPIO_ACTIVE_HIGH>;
            mram-params = <0 16 16 8 8 8 16 16 16>;
            tx-config = <8 8 0 64>;
            rx-config = <64 64 64>;
    };

hello scs2.dxavier,

you might calculate wrong GPIO numbers.
please access Jetson TX2 Platform Adaptation and Bring-Up Guide, you should check [GPIO Changes] session for GPIO number calculations.
thanks