181 U_BOOT_DRIVER(spi_flash_std) = {
  182     .name       = "spi_flash_std",
  183     .id     = UCLASS_SPI_FLASH,
  184     .of_match   = spi_flash_std_ids,
  185     .probe      = spi_flash_std_probe,
  186     .remove     = spi_flash_std_remove,
  187     .priv_auto_alloc_size = sizeof(struct spi_flash),
+ 188     .per_child_auto_alloc_size = sizeof(struct spi_slave),//在这里赋值没有生效
  189     .ops        = &spi_flash_std_ops,
  190 };

//drivers/core/device.c
 343     if (dev->parent) {
+ 344         printf("device_probe, get parent size\n");
  345         size = dev->parent->driver->per_child_auto_alloc_size;
  346         if (!size) {
~ 348             size = dev->parent->uclass->uc_drv->per_child_auto_alloc_size;
  349         }
+ 350         if (!size){
+ 352             //size = sizeof(struct spi_slave);//有报错
+ 353             size = 48;//通过其他地方打印的spi_slave大小
+ 354         }
+ 355
  357         if (size && !dev->parent_priv) {//分配parent_priv空间
  358             dev->parent_priv = alloc_priv(size, drv->flags);
  360             if (!dev->parent_priv) {
  362                 ret = -ENOMEM;
  363                 goto fail;
  364             }
  365         }
  366

2.搞完第一步后，发现上电后就卡住了，经加log发现是在spi_claim_bus这里运行不下去

//drivers/mtd/spi/sf_probe.c
 25 static int spi_flash_probe_slave(struct spi_flash *flash)
   26 {
   27     struct spi_slave *spi = flash->spi;//通过打印，flash传进来的是udevice ,spi@04026000
   28     int ret;
   29
   30     /* Setup spi_slave */
   31     if (!spi) {
   33         return -ENODEV;
   34     }
   35
   37     /* Claim spi bus */
~  38     ret = spi_claim_bus(spi);//这里是调用到drivers/spi/spi-uclass.c的实现
   39     if (ret) {
   40         debug("SF: Failed to claim SPI bus: %d\n", ret);
   41         return ret;
   42     }

//drivers/spi/spi-uclass.c
int spi_claim_bus(struct spi_slave *slave)
{
    return log_ret(dm_spi_claim_bus(slave->dev));
}
50 int dm_spi_claim_bus(struct udevice *dev)
   51 {
+  52     pr_err("spi/spi-uclass, spi_claim_bus->dm_spi_claim_bus\n\n");
+  53
   54     struct udevice *bus = dev->parent;
~  55     if (bus == NULL){
+  56         pr_err("debug, is null pointer\n");
+  57     }else{
+  58         pr_err("debug, spi_get_ops, bus = dev->parent, , \n");//貌似不能直接获取结构体内容
+  61         struct dm_spi_ops *ops = spi_get_ops(bus);//这里的bus应该是一个父设备，这里获取父设备的ops，最终是卡在这里，spi_get_ops是获取bus->driver->ops
+  62     }
+  63

分析代码是spi_claim_bus函数里面想拿执行spi_get_opt(bus)，但程序跑到这里就卡住没往下执行了，应该是一个空的内容

串口打印如下：

[02.207]debug, spi_claim_bus, 
[02.210]spi/spi-uclass, spi_claim_bus->dm_spi_claim_bus

[02.215]debug, spi_get_ops, bus = dev->parent, ,