///drivers/core/root.c
  350     /* bind fixed-clock */
  351     node = ofnode_path("/clocks");
  352     /* if no DT "clocks" node, no need to go further */
~ 353     if (!ofnode_valid(node)){
+ 354         pr_debug("debug, not found ofnode_valid node\n");
  355         return ret;
+ 356     }
+ 364
+ 365         //直接进入到这里执行
+ 366         pr_debug("debug, dm_scan_fdt_node\n\n");
  367         ret = dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset,
  368                        pre_reloc_only);
  369     if (ret)
~ 370         pr_debug("dm_scan_fdt_node() failed: %d\n", ret);
+ 371
+ 372
+ 373     pr_debug("\n\n");
+ 374     node = ofnode_path("/hello_dts_name@1234");
+ 375     if (!ofnode_valid(node)){
+ 376         pr_debug("find node faile\n");
+ 377         return ret;
+ 378     }
+ 379
+ 380     ret = uclass_get_device_by_name(UCLASS_HELLO_CJ, "hello_dts_name@1234", &getdev);
+ 381     if (ret){
+ 382         pr_debug("debug, can not get device hello\n");
+ 383         ret = uclass_get_device_by_driver(UCLASS_HELLO_CJ, DM_GET_DRIVER(hello_drv), &getdev);
+ 384         if (ret){
+ 385             pr_debug("debug, stil can not find device\n");
+ 386         }
+ 387     }
+ 388     ret = dm_scan_fdt_node(getdev, gd->fdt_blob, node.of_offset,pre_reloc_only);
+ 389     if (ret){
+ 390         pr_debug("dm_scan_fdt node faile\n");
+ 391     }

修改后的串口dm tree打印

=> dm tree
 Class      Probed  Driver      Name
----------------------------------------
 root       [ + ]   root_drive  root_driver
 hello_cj_c [ + ]   hello_drv   |-- hello_dts_name@1234
 hello_cj_c [   ]   hello_drv_  |   `-- hello_dts_child@5678
 spi_flash  [   ]   spi_flash_  `-- spi@04026000
=> 

uboot的spi1 dts配置

//uboot-origin_master/arch/riscv/dts/sun20iw1p1-soc-system.dts
  6 /dts-v1/;
   11 / {
   12     model = "sun20iw1";
   13     compatible = "allwinner,riscv", "arm,sun20iw1p1";
   14     #address-cells = <2>;
   15     #size-cells = <2>;
+  18     hellohqh: hello_dts_name@1234 {
+  19
+  20         #address-cells = <1>;
+  21         #size-cells = <0>;
+  22         compatible = "hello_dts";
+  23         reg = <0x02000000>;
+  24         pinctrl-names = "default", "sleep";
+  25         pinctrl-0 = <&gpiotest_pins>;
+  26
+  27         hellohqh1: hello_dts_child@5678 {
+  28             compatible = "hello_child_dts";
+  29             reg = <0x31>;
+  30             hellohqh2: hello_dts_child_child@99991 {
+  31                 compatible = "hello_child_child_dts";
+  32
+  33                 };
+  34           };
+  35     };

   37     soc: soc@29000000 {
   38         #address-cells = <2>;
   39         #size-cells = <2>;

+ 427         spi1: spi@04026000 {
+ 428             //#address-cells = <1>;
+ 429             //#size-cells = <0>;
+ 430             compatible = "allwinner,sun20i-spi";
+ 431             device_type = "spi1";
+ 432             reg = <0x0 0x04026000 0x0 0x1000>;
+ 433             //interrupts-extended = <&plic0 31 IRQ_TYPE_LEVEL_HIGH>;
+ 434             //clocks = <&ccu CLK_PLL_PERIPH0>, <&ccu CLK_SPI0>, <&ccu CLK_BUS_SPI0>;
+ 435             //clock-names = "pll", "mod", "bus";
+ 436             //resets = <&ccu RST_BUS_SPI0>;
+ 437             clock-frequency = <100000000>;
+ 438             pinctrl-names = "default", "sleep";
+ 439             spi1_cs_number = <1>;
+ 440             spi1_cs_bitmap = <1>;
+ 441             spi_slave_mode = <0>;
+ 442             //dmas = <&dma 22>, <&dma 22>;
+ 443             //dma-names = "tx", "rx";
+ 444             pinctrl-0 = <&spi1_pins_a &spi1_pins_b>;
+ 445             pinctrl-1 = <&spi1_pins_c>;
+ 446             status = "okay";
+ 447             spi-nor {
+ 448                 compatible = "jedec,spi-nor";
+ 449                 spi-max-frequency=<0x5F5E100>;
+ 450                 reg = <0x0>;
+ 451                 spi-rx-bus-width=<0x01>;
+ 452                 spi-tx-bus-width=<0x01>;
+ 453                 status="okay";
+ 454             };
+ 455         };
+ 273             spi1_pins_a: spi1@0 {
+ 274                 allwinner,pins = "PD11", "PD12", "PD13","PD14", "PD15";
+ 275                 allwinner,pname = "spi1_sclk", "spi1_mosi","spi1_miso", "spi1_hold", "spi1_wp";
+ 276                 allwinner,function = "spi1";
+ 277                 allwinner,muxsel = <4>;
+ 278                 allwinner,drive = <1>;
+ 279                 allwinner,pull = <0>;
+ 280             };
+ 281
+ 282             spi1_pins_b: spi1@1 {
+ 283                 allwinner,pins = "PD10";
+ 284                 allwinner,pname = "spi1_cs0";
+ 285                 allwinner,function = "spi1";
+ 286                 allwinner,muxsel = <4>;
+ 287                 allwinner,drive = <1>;
+ 288                 allwinner,pull = <1>;   // only CS should be pulled up
+ 289             };
+ 290
+ 291             spi1_pins_c: spi1@2 {
+ 292                 allwinner,pins = "PD10", "PD11", "PD12", "PD13","PD14", "PD15";
+ 293                 allwinner,function = "gpio_in";
+ 294                 allwinner,muxsel = <0>;
+ 295                 allwinner,drive = <1>;
+ 296                 allwinner,pull = <0>;
+ 297             };
  307         };

3.我看了一下drivers/sunxi_flash/sunxi_flash.c，貌似不是基于DM模型的驱动，这个是怎么调用的呀？大佬是否可以指导指导，还在学习阶段好多东西都不懂