{"id":92132,"date":"2026-08-09T13:17:00","date_gmt":"2026-08-09T05:17:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/92132.html"},"modified":"2026-08-09T13:17:00","modified_gmt":"2026-08-09T05:17:00","slug":"%e8%ae%be%e5%a4%87%e6%a0%91%e5%ad%a6%e4%b9%a05-%e8%af%bb%e5%86%99%e5%ae%9e%e6%93%8d","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/92132.html","title":{"rendered":"\u8bbe\u5907\u6811\u5b66\u4e605--\u8bfb\u5199\u5b9e\u64cd"},"content":{"rendered":"

\u5b9e\u73b0\u4e00\u4e2a\u9a71\u52a8\u8bfb\u53d6\u81ea\u5df1\u5b9a\u4e49\u7684\u8bbe\u5907\u6811<\/p>\n

1 \u8bbe\u5907\u6811\u8bfb\u5199\u63a5\u53e3<\/h2>\n

\u5934\u6587\u4ef6<\/p>\n

#include <linux\/of.h> \/\/\u8282\u70b9\u3001\u5c5e\u6027\u57fa\u7840\u63a5\u53e3
\n#include <linux\/of_address.h> \/\/reg\u7269\u7406\u5730\u5740
\n#include <linux\/of_irq.h> \/\/\u4e2d\u65ad
\n#include <linux\/of_gpio.h> \/\/GPIO
\n#include <linux\/of_clk.h> \/\/\u65f6\u949f
\n#include <linux\/of_pinctrl.h> \/\/\u5f15\u811a\u914d\u7f6e
\n#include <linux\/of_property.h> <\/p>\n

\u67e5\u627e\/\u904d\u5386\u8bbe\u5907\u8282\u70b9<\/p>\n\n\u63a5\u53e3\u529f\u80fd\u8bf4\u660e<\/tr>\n\n\n\n\n\n\n\n\n\n
of_find_node_by_path()<\/td>\n\u6309\u7167\u8bbe\u5907\u6811\u5168\u8def\u5f84\u67e5\u627e\u8282\u70b9<\/td>\n<\/tr>\n
of_find_node_by_name()<\/td>\n\u6309\u8282\u70b9 name \u67e5\u627e<\/td>\n<\/tr>\n
of_find_node_by_type()<\/td>\n\u6309 device\u2011type \u5c5e\u6027\u67e5\u627e<\/td>\n<\/tr>\n
of_find_compatible_node()<\/td>\n\u6839\u636e compatible \u5339\u914d\u8282\u70b9<\/td>\n<\/tr>\n
of_get_child_by_name()<\/td>\n\u83b7\u53d6\u6307\u5b9a\u540d\u5b57\u7684\u5b50\u8282\u70b9<\/td>\n<\/tr>\n
of_next_child_node()<\/td>\n\u5faa\u73af\u904d\u5386\u6240\u6709\u5b50\u8282\u70b9<\/td>\n<\/tr>\n
of_node_put()<\/td>\n\u8282\u70b9\u5f15\u7528\u8ba1\u6570\u91ca\u653e（\u67e5\u5230\u8282\u70b9\u5fc5\u987b\u8c03\u7528）<\/td>\n<\/tr>\n
of_device_is_available()<\/td>\n\u5224\u65ad\u8282\u70b9 status = "okay" \u662f\u5426\u542f\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u8bfb\u53d6\u8282\u70b9\u5c5e\u6027（\u6700\u5e38\u7528）<\/p>\n\n\u63a5\u53e3\u7528\u9014<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n
of_property_read_bool(node, "xxx")<\/td>\n\u5e03\u5c14\u5c5e\u6027，\u5b58\u5728\u5373\u8fd4\u56de true<\/td>\n<\/tr>\n
of_property_read_u8()<\/td>\n\u8bfb\u53d6 uint8 \u5c5e\u6027<\/td>\n<\/tr>\n
of_property_read_u16()<\/td>\n\u8bfb\u53d6 uint16<\/td>\n<\/tr>\n
of_property_read_u32()<\/td>\n\u8bfb\u53d6\u5355\u4e2a 32 \u4f4d\u6574\u578b<\/td>\n<\/tr>\n
of_property_read_u64()<\/td>\n\u8bfb\u53d6 64 \u4f4d\u6574\u578b<\/td>\n<\/tr>\n
of_property_read_u32_array()<\/td>\n\u8bfb\u53d6 u32 \u6570\u7ec4<\/td>\n<\/tr>\n
of_property_read_string()<\/td>\n\u8bfb\u53d6\u5b57\u7b26\u4e32\u5c5e\u6027<\/td>\n<\/tr>\n
of_property_read_string_array()<\/td>\n\u8bfb\u53d6\u5b57\u7b26\u4e32\u6570\u7ec4<\/td>\n<\/tr>\n
of_property_match_string()<\/td>\n\u5339\u914d\u5b57\u7b26\u4e32\u5217\u8868\u7d22\u5f15<\/td>\n<\/tr>\n
of_find_property()<\/td>\n\u83b7\u53d6 property \u539f\u59cb\u7ed3\u6784\u4f53<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

reg\u7269\u7406\u5185\u5b58\u5730\u5740\u64cd\u4f5c<\/p>\n\n\u63a5\u53e3\u4f5c\u7528<\/tr>\n\n\n\n\n\n
of_address_to_resource()<\/td>\nreg \u8f6c\u4e3a struct\u2011resource<\/td>\n<\/tr>\n
of_iomap()<\/td>\n\u7269\u7406\u5730\u5740\u6620\u5c04\u6210\u5185\u6838\u865a\u62df\u5730\u5740<\/td>\n<\/tr>\n
of_iounmap()<\/td>\n\u89e3\u9664\u5730\u5740\u6620\u5c04<\/td>\n<\/tr>\n
of_address_in_resource()<\/td>\n\u68c0\u67e5\u5730\u5740\u662f\u5426\u843d\u5728 reg \u533a\u95f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e2d\u65ad\u8d44\u6e90<\/p>\n\n\u63a5\u53e3\u8bf4\u660e<\/tr>\n\n\n\n\n
irq_of_parse_and_map()<\/td>\n\u89e3\u6790 interrupts \u5c5e\u6027\u3001\u6620\u5c04\u4e2d\u65ad\u53f7<\/td>\n<\/tr>\n
of_irq_get()<\/td>\n\u83b7\u53d6\u8282\u70b9\u7b2c n \u4e2a\u4e2d\u65ad<\/td>\n<\/tr>\n
of_irq_to_resource()<\/td>\n\u4e2d\u65ad\u8f6c\u4e3a resource \u7ed3\u6784\u4f53<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

phandle\u5f15\u7528\u8282\u70b9<\/p>\n\n\u63a5\u53e3\u8bf4\u660e<\/tr>\n\n\n\n
of_parse_phandle()<\/td>\n\u89e3\u6790 phandle，\u62ff\u5230\u88ab\u5f15\u7528\u8282\u70b9<\/td>\n<\/tr>\n
of_parse_phandle_with_args()<\/td>\n\u89e3\u6790\u5e26\u53c2\u6570\u7684 phandle（\u4e2d\u65ad\u63a7\u5236\u5668\u5e38\u7528）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6b64\u5916\u8fd8\u6709\u4e00\u4e9b，\u5c31\u4e0d\u5168\u90e8\u5217\u4e86\u3002\u3002<\/p>\n<\/p>\n

2 \u4e00\u4e2a\u4f8b\u5b50<\/h2>\n

\u5b9e\u9a8c\u662f\u57fa\u4e8e\u6811\u8393\u6d3e，\u4e3b\u8981\u662f\u73af\u5883\u65b9\u4fbf\u3002<\/p>\n

2.1 \u8bbe\u5907\u6811<\/h3>\n

\/*
\n * Custom Device Tree Overlay for Raspberry Pi DT experiment
\n * Defines a platform device node "tom,mydevice" with various property
\n * types that a driver can parse: string, u32 array, u64, GPIO, IRQ, clock.
\n *\/<\/p>\n

\/dts-v1\/;
\n\/plugin\/;<\/p>\n

\/ {
\n compatible = "brcm,bcm2712";<\/p>\n

fragment@0 {
\n target-path = "\/";
\n __overlay__ {
\n tom_mydevice: tom,mydevice {
\n compatible = "tom,mydevice";
\n status = "okay";<\/p>\n

\/* string properties *\/
\n device-name = "tom-demo-device";
\n description = "A demo DT node for parsing practice";<\/p>\n

\/* u32 scalar *\/
\n version = <0x00010002>;<\/p>\n

\/* u32 array *\/
\n channel-ids = <1 2 3 4 8>;<\/p>\n

\/* u64 (as two 32-bit cells, big-endian) *\/
\n big-counter = <0x00000001 0x11223344>;<\/p>\n

\/* GPIO pin number (real BCM GPIO 17) *\/
\n led-gpio = <&gpio 17 0>;<\/p>\n

\/* GPIO handled via gpios prop *\/
\n gpios = <&gpio 22 0>, <&gpio 23 0>;<\/p>\n

\/* interrupts on a free IRQ line (10) *\/
\n interrupts = <10>;
\n interrupt-parent = <&gpio>;<\/p>\n

\/* clock reference: use the system's 108M clock *\/
\n clocks = <&clk_108MHz>;
\n clock-names = "sysclk";<\/p>\n

\/* child node for nested parsing demo *\/
\n child-config {
\n #address-cells = <1>;
\n #size-cells = <1>;
\n label = "child-1";
\n reg = <0x0 0x1000>;
\n };
\n };
\n };
\n };<\/p>\n

__overrides__ {
\n mydevice-enabled = <&tom_mydevice>,"status";
\n };
\n};<\/p>\n

2.2 \u9a71\u52a8<\/h3>\n

\/\/ tom_device_driver.c
\n\/\/ Platform driver that parses properties from the "tom,mydevice"
\n\/\/ device tree node defined in tom-device.dts overlay.
\n#include <linux\/init.h>
\n#include <linux\/module.h>
\n#include <linux\/platform_device.h>
\n#include <linux\/of.h>
\n#include <linux\/of_gpio.h>
\n#include <linux\/of_irq.h>
\n#include <linux\/clk.h>
\n#include <linux\/gpio\/consumer.h><\/p>\n

MODULE_LICENSE("Dual BSD\/GPL");
\nMODULE_AUTHOR("Tom");
\nMODULE_DESCRIPTION("Parse custom device tree properties");<\/p>\n

static int tom_device_probe(struct platform_device *pdev)
\n{
\nstruct device *dev = &pdev->dev;
\nstruct device_node *np = dev->of_node;
\nconst char *name, *desc;
\nu32 version;
\nu32 channels[8];
\nint nch, i;
\nu64 big_counter;
\nu32 counter_hi, counter_lo;
\nint gpio_led, ret;
\nstruct gpio_desc *led_gpio;
\nstruct clk *clk;<\/p>\n

dev_info(dev, "=== Tom Device DT probe ===\\\\n");
\nif (!np) {
\ndev_err(dev, "No OF node!\\\\n");
\nreturn -ENODEV;
\n}
\ndev_info(dev, "OF node full name: %s\\\\n", np->full_name);<\/p>\n

\/* 1. String properties *\/
\nret = of_property_read_string(np, "device-name", &name);
\nif (!ret)
\ndev_info(dev, "device-name = %s\\\\n", name);
\nelse
\ndev_err(dev, "read device-name failed: %d\\\\n", ret);<\/p>\n

ret = of_property_read_string(np, "description", &desc);
\nif (!ret)
\ndev_info(dev, "description = %s\\\\n", desc);<\/p>\n

\/* 2. u32 scalar *\/
\nret = of_property_read_u32(np, "version", &version);
\nif (!ret)
\ndev_info(dev, "version = 0x%08x (%u)\\\\n", version, version);<\/p>\n

\/* 3. u32 array *\/
\nnch = of_property_read_variable_u32_array(np, "channel-ids", channels,
\n 0, ARRAY_SIZE(channels));
\nif (nch > 0) {
\ndev_info(dev, "channel-ids count = %d:", nch);
\nfor (i = 0; i < nch; i++)
\npr_cont(" %u", channels[i]);
\npr_cont("\\\\n");
\n} else {
\ndev_err(dev, "read channel-ids failed: %d\\\\n", nch);
\n}<\/p>\n

\/* 4. u64 property (two cells) *\/
\nret = of_property_read_u32_index(np, "big-counter", 0, &counter_hi);
\nif (ret == 0)
\nret = of_property_read_u32_index(np, "big-counter", 1, &counter_lo);
\nif (!ret) {
\nbig_counter = ((u64)counter_hi << 32) | counter_lo;
\ndev_info(dev, "big-counter = 0x%016llx\\\\n", big_counter);
\n} else {
\ndev_err(dev, "read big-counter failed: %d\\\\n", ret);
\n}<\/p>\n

\/* 5. GPIO via of_get_named_gpio *\/
\ngpio_led = of_get_named_gpio(np, "led-gpio", 0);
\nif (gpio_is_valid(gpio_led))
\ndev_info(dev, "led-gpio = GPIO %d\\\\n", gpio_led);
\nelse
\ndev_err(dev, "led-gpio invalid: %d\\\\n", gpio_led);<\/p>\n

\/* 6. GPIO via devm_gpiod_get_optional (gpios property) *\/
\nled_gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_ASIS);
\nif (IS_ERR(led_gpio)) {
\ndev_err(dev, "gpiod get failed: %ld\\\\n", PTR_ERR(led_gpio));
\n} else if (led_gpio) {
\nint gpionum = desc_to_gpio(led_gpio);
\ndev_info(dev, "gpios[0] desc -> GPIO %d\\\\n", gpionum);
\n} else {
\ndev_info(dev, "no gpios property found\\\\n");
\n}<\/p>\n

\/* 7. Interrupt *\/
\n{
\nint irq = of_irq_get(np, 0);
\nif (irq >= 0)
\ndev_info(dev, "interrupts[0] -> irq = %d\\\\n", irq);
\nelse
\ndev_info(dev, "no irq (%d)\\\\n", irq);
\n}<\/p>\n

\/* 8. Clock *\/
\nclk = devm_clk_get(dev, "sysclk");
\nif (IS_ERR(clk)) {
\ndev_info(dev, "clock sysclk not available: %ld\\\\n", PTR_ERR(clk));
\n} else {
\nunsigned long rate = clk_get_rate(clk);
\ndev_info(dev, "clock sysclk rate = %lu Hz\\\\n", rate);
\n}<\/p>\n

\/* 9. Child node *\/
\n{
\nstruct device_node *child;
\nchild = of_get_child_by_name(np, "child-config");
\nif (child) {
\nconst char *clabel;
\nu32 caddr;
\nif (!of_property_read_string(child, "label", &clabel))
\ndev_info(dev, "child-config label = %s\\\\n", clabel);
\nif (!of_property_read_u32_index(child, "reg", 1, &caddr))
\ndev_info(dev, "child-config reg[1] = 0x%x\\\\n", caddr);
\nof_node_put(child);
\n} else {
\ndev_info(dev, "no child-config node\\\\n");
\n}
\n}<\/p>\n

\/* 10. Show full raw property dump via \/sys nodes *\/
\ndev_info(dev, "=== probe complete ===\\\\n");
\nreturn 0;
\n}<\/p>\n

static void tom_device_remove(struct platform_device *pdev)
\n{
\ndev_info(&pdev->dev, "Tom device removed\\\\n");
\n}<\/p>\n

static const struct of_device_id tom_device_of_match[] = {
\n{ .compatible = "tom,mydevice" },
\n{ }
\n};
\nMODULE_DEVICE_TABLE(of, tom_device_of_match);<\/p>\n

static struct platform_driver tom_device_driver = {
\n.probe = tom_device_probe,
\n.remove = tom_device_remove,
\n.driver = {
\n.name = "tom_device",
\n.of_match_table = tom_device_of_match,
\n},
\n};<\/p>\n

module_platform_driver(tom_device_driver);<\/p>\n

2.3 \u8fd0\u884c<\/h3>\n

\u8fd0\u884c\u65b9\u6cd5：<\/p>\n

\u7f16\u8bd1：dtc -@ -I dts -O dtb -o tom-device.dtbo tom-device.dts（-@ \u4fdd\u7559\u7b26\u53f7）\u3002<\/p>\n

\u4e4b\u540e\u7f16\u8bd1\u9a71\u52a8\u5e76insmod\u3002<\/p>\n<\/p>\n

\u8fd0\u884c\u7ed3\u679c：<\/p>\n

tom_device tom,mydevice: device-name = tom-demo-device
\ntom_device tom,mydevice: description = A demo DT node for parsing practice
\ntom_device tom,mydevice: version = 0x00010002 (65538)
\ntom_device tom,mydevice: channel-ids count = 5:
\ntom_device tom,mydevice: big-counter = 0x0000000111223344
\ntom_device tom,mydevice: led-gpio = GPIO 588
\ntom_device tom,mydevice: gpios[0] desc -> GPIO 593
\ntom_device tom,mydevice: no irq (-75)
\ntom_device tom,mydevice: clock sysclk rate = 108000000 Hz
\ntom_device tom,mydevice: child-config label = child-1
\ntom_device tom,mydevice: child-config reg[1] = 0x1000<\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5b9e\u73b0\u4e00\u4e2a\u9a71\u52a8\u8bfb\u53d6\u81ea\u5df1\u5b9a\u4e49\u7684\u8bbe\u5907\u6811
\n1 \u8bbe\u5907\u6811\u8bfb\u5199\u63a5\u53e3
\n\u5934\u6587\u4ef6
\n#include \/\/\u8282\u70b9\u3001\u5c5e\u6027\u57fa\u7840\u63a5\u53e3
\n#include \/\/reg\u7269\u7406\u5730\u5740
\n#include \/\/\u4e2d\u65ad
\n#include \/\/GPIO
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