这个是初始化函数
static void __init am335x_evm_i2c1_init(void)
{
setup_pin_mux(i2c1_pin_mux);
gpio_request(GPIO_TO_PIN(3,7),"SCR_RST"); //复位
gpio_direction_output(GPIO_TO_PIN(3,7), 1); //中断
omap_register_i2c_bus(2, 100, am335x_i2c1_boardinfo,
ARRAY_SIZE(am335x_i2c1_boardinfo));
}