Linux从设备树取gpio号,linux设备树之gpio

#include /* DTS

myled{

compatible = "led";

/* led2-5: gpx2_7 gpx1_0 gpf3_4 gpf3_5 *//*

gpios = , , , ;

};

*/

MODULE_LICENSE("Dual BSD/GPL");

MODULE_DESCRIPTION("a simple driver example!");

//create a platform driver

struct resource *res;

int led_pin;

int led_probe(struct platform_device *pdev)

{

int i = 0;

char name_buf[10] = {0};

printk("probe !n");

// 获取DTS：gpios = , , , ;(正式)

for(i = 0; i < 4; i++) {

// 从DTB解析管脚

led_pin = of_get_gpio(pdev->dev.of_node, i);

printk("led-gpio: %dn", led_pin);

sprintf(name_buf, "led%d-pin", i);

devm_gpio_request(&pdev->dev, led_pin, name_buf);

// gpio_request(led_pin, name_buf);

gpio_direction_output(led_pin, 1);

gpio_set_value(led_pin, 1);

}

#if 0

// 获取DTS：reg = <0x11000c40 4>;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

printk("baseaddr: %#xn", res->start);

// 获取DTS：pin = <7>; (非正式)

res = platform_get_resource_byname(pdev, 0, "pin");

printk("pinnum: %#xn", res->start);

#endif

return 0;

}

int led_remove(struct platform_device *pdev)

{

printk("remove !n");

return 0;

}

struct of_device_id led_table[] = {

{.compatible = "led"},

{}

};

struct platform_driver led_driver = {

.probe = led_probe,

.remove = led_remove,

.driver = {

.name = "11000c40.led_node",

.of_match_table = led_table

}

};

static int led_init(void)

{

printk("module installn");

//add into platform bus

platform_driver_register(&led_driver);

return 0;

}

static void led_exit(void)

{

printk("module releasen");

//del from platform bus

platform_driver_unregister(&led_driver);

}

module_init(led_init);

module_exit(led_exit);