tegra_gpio_pin_ctl
static void tegra_gpio_pin_ctl(void *, int, int);
bank->bank_gc.gp_pin_ctl = tegra_gpio_pin_ctl;
tegra_gpio_pin_ctl(&gpin->pin_bank, gpin->pin_no, gpin->pin_flags);
tegra_gpio_pin_ctl(&gpin->pin_bank, gpin->pin_no, gpin->pin_flags);
tegra_gpio_pin_ctl(&gpin->pin_bank, gpin->pin_no, GPIO_PIN_INPUT);