比如如下的myip_led_0節點下面的子節點

/ {
	amba_pl: [email protected] {
		#address-cells = <2>;
		#size-cells = <2>;
		compatible = "simple-bus";
		ranges ;
		myip_led_0: [email protected] {
			compatible = "xlnx,myip-led-1.0";
			reg = <0x0 0x80001000 0x0 0x1000>;
			clock-names = "ref_clk", "pclk";
			clocks = <&clk 31>, <&clk 32>;
			/*clocks = <&clk 19>, <&clk 31>;*/
			xlnx,s00-axi-addr-width = <0x4>;
			xlnx,s00-axi-data-width = <0x20>;

			led0: led0 {
				#phy-cells = <4>;
			};
			led1: led1 {
				#phy-cells = <4>;
			};
			led2: led2 {
				#phy-cells = <4>;
			};
		
		};
	};
};
 

用如下的程式碼打印出來！

static int led_simple_probe(struct platform_device *pdev)

{

	struct device 		*dev=&pdev->dev;

	struct device_node 	*np=dev->of_node;

	struct device_node 	*child;
	struct resource		*res;

	struct list_head        *ptr = NULL;
	struct list_head 	*pos;

	struct list_head	clklist=dev->devres_head;
	int 			clkCnt=0;
	int			index=0;

	struct myled_dev *ledDev;

	ledDev=devm_kzalloc(dev, sizeof(*ledDev), GFP_KERNEL);

	if(!ledDev)
		return -ENOMEM;

	ledDev->dev=dev;

	res = platform_get_resource(pdev,IORESOURCE_MEM, 0);
	
	printk(KERN_ERR "res.start=%llx,res.end=%llx\n",res->start,res->end);
	printk(KERN_ERR"pdev->name is %s\n",pdev->name);

	list_for_each(pos,&dev->devres_head){
		clkCnt++;
	}
	printk(KERN_ERR"Total resource number clkCnt =%d\n",clkCnt);
	clkCnt=0;

	ledDev->pclk = devm_clk_get(&pdev->dev, "pclk");
	if (IS_ERR(ledDev->pclk)) {
		dev_err(dev, "pclk clock not found.\n");
		return -1;
	}
	
	list_for_each(pos,&dev->devres_head){
		clkCnt++;
	}


	for (index = 0; index < of_get_child_count(dev->of_node); index++) {
		printk(KERN_ERR"Phy index =%d\n",index);	
	}

	for_each_child_of_node(np, child)
		printk(KERN_ERR"child->name=%s,child->full_name=%s,%p\n",child->name,child->full_name,child);
		

	printk(KERN_ERR"Total resource number clkCnt =%d\n",clkCnt);

	printk(KERN_ERR"led np->name=%s,np->full_name=%s\n",np->name,np->full_name);

	printk(KERN_ERR"kobject name is %s\n",dev->kobj.name);
	return 0;

	

}
 

列印結果如下：