uboot中初始化IO口

first {
        compatible = "marvell,first";  //first随便取的一个名字
        reset-gpio = <&gpionb 14 GPIO_ACTIVE_LOW>;  //MPP1_14（北桥第14个gpio,从0开始）蜂鸣器
        wdi-gpio = <&gpiosb 1 GPIO_ACTIVE_LOW>;     //MPP2_1   看门狗
        enable-gpio = <&gpionb 9 GPIO_ACTIVE_LOW>;  //MPP1_9   WDI enable    
};

 int board_init(void)
 {
+        struct gpio_desc gpio = {};
+        struct gpio_desc wdi_gpio = {};
+        struct gpio_desc enable_gpio = {};
+        int node;
         /* adress of boot parameters */
         gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;

         /* enable serdes lane 2 mux for sata phy */
         board_comphy_usb3_sata_mux(COMPHY_LANE2_MUX_SATA);

- node = fdt_node_offset_by_compatible(gd-fdt_blob, 0,"marvell,first");
- if (node  0)
- {                          
- printf("===========================Don't find marvell,first node\n");
- return -1; 
- }
+
- gpio_request_by_name_nodev(offset_to_ofnode(node), "reset-gpio",0, gpio,       
- GPIOD_IS_OUT); /* 在驱动中调用gpio_request_by_name_nodev接口或者其他接口从dtsi节点 
- 中获取对应GPIO属性的gpio_desc描述符 */
- gpio_request_by_name_nodev(offset_to_ofnode(node), "wdi-gpio",0, wdi_gpio, 
- GPIOD_IS_OUT);
- gpio_request_by_name_nodev(offset_to_ofnode(node), "enable-gpio",0, 
- enable_gpio, GPIOD_IS_OUT);
- if (dm_gpio_is_valid(gpio)) /调用dm_gpio_is_valid判断该gpio_desc是否可用/
- {
- dm_gpio_set_value(gpio, 1);  /* MPP1_14置0，启动uboot时关闭蜂鸣器  */
- }
+
- if (dm_gpio_is_valid(wdi_gpio))
- {
- dm_gpio_set_value(wdi_gpio, 1);  /* gpio设置1是低电平，0是高电平 */
- }
+
- if (dm_gpio_is_valid(enable_gpio))
- {  
- dm_gpio_set_value(enable_gpio, 1);/*  默认输出低0，开门狗功能使能， 
- 开启开门狗功能后，此IO需置高1方可使能 */
- }
  return 0;
 }

    #ifdef CONFIG_PS2KBD
            initr_kbd,
    #endif
+           board_init,
            run_main_loop,