尊龙凯时人生就是搏

Linux DTSÊÇʲô£¿ÔõÑùʹÓã¿

Linux DTS£¨Device Tree Source£©ÊÇÒ»ÖÖÐÎòӲ¼þÐÅÏ¢µÄÊý¾Ý½á¹¹ £¬Ö÷ÒªÓÃÓÚÐÎòǶÈëʽϵͳÖи÷¸öÓ²¼þ×°±¸µÄÐÅÏ¢ £¬°üÀ¨×°±¸µÄµØµã¡¢ÖÐÖ¹¡¢¼Ä´æÆ÷ÉèÖÃÒÔ¼°×°±¸Çý¶¯µÈ¡£ÔÚLinuxÄÚºËÖÐ £¬DTSÎļþͨ³£±»ÓÃÀ´ÐÎò°åÔØ×°±¸µÄÓ²¼þÐÅÏ¢ £¬ÒÔ±ã²Ù×÷ϵͳÄܹ»×¼È·µØʶ±ðºÍʹÓÃÓ²¼þ×°±¸¡£

DTSÎļþ½á¹¹

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/dts-v1/;

#include <imx6qdl-pico.dtsi>
#include <imx6qdl-pico-m4.dtsi>

/ {
    compatible = "fsl,imx6q-pico", "fsl,imx6q";
    
    model = "Boundary Devices i.MX6 Quad SABRE Lite";
    
    memory {
        device_type = "memory";
        reg = <0x10000000 0x40000000>;
    };
    
    chosen {
        compatible = "brcm,bcm2835";
        uart_boot = <&uart1>;
    };

    aliases {
        serial0 = &uart1;
    };

    soc {
        compatible = "simple-bus";
        #address-cells = <1>;
        #size-cells = <1>;
        ranges;
        
        gpio: gpio@0209c000 {
            compatible = "fsl,imx6ul-gpio";
            reg = <0x0209c000 0x1000>;
            interrupts = <GPIOn IRQn>;
            gpio-controller;
            #gpio-cells = <2>;
        };
    
    };
    
    uart1: serial@02020000 {
        compatible = "fsl,imx6q-uart", "fsl,imx21-uart";
        reg = <0x02020000 0x40000>;
        interrupts = <78>;
        clocks = <&clks 82>;
        clock-names = "ipg", "per";
        status = "okay";
    };
    
    sound {
        compatible = "fsl,imx6-sai";
        model = "imx6-sai";
        status = "okay";
        /* SSI1 */
        ssi@021d8000 {
            compatible = "fsl,imx6-sai";
            reg = <0x021d8000 0x4000>;
            interrupts = <0 125 0>;
            clocks = <&clks 2>;
            dmas = <&sdma 9 11 0>, <&sdma 10 11 0>, <&sdma 11 11 0>;
            dma-names = "tx", "rx", "mclk";
            status = "okay";
        };
    };
};

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DTSÎļþÄÚÈÝ˵Ã÷

/dts-v1/: Ö¸¶¨°æ±¾ÎªDTS°æ±¾1 £¬ÐÎòDTSÎļþµÄ°æ±¾ÐÅÏ¢¡£

#include : °üÀ¨ÆäËûDTSÎļþ £¬¿É¸´ÓÃÆä½ç˵¡£

/: ¸ù½Úµã £¬ÐÎòÕû¸ö×°±¸Ê÷½á¹¹¡£

compatible: Ö¸¶¨×°±¸¼æÈÝÐÔÐÅÏ¢¡£

model: ×°±¸ÐͺÅÐÅÏ¢¡£

memory: ÐÎòÄÚ´æÐÅÏ¢¡£

chosen: ÐÎòһЩѡÏîÐÅÏ¢¡£

aliases: ½ç˵װ±¸ÓÖÃû¡£

soc: ÐÎòSoCÏà¹ØÐÅÏ¢¡£

gpio: ÐÎòGPIO¿ØÖÆÆ÷¡£

uart1: ÐÎòUART1Ó²¼þÐÅÏ¢¡£

sound: ÐÎòÉùÒô×°±¸ÐÅÏ¢¡£

ÔõÑùʹÓÃLinux DTS

±à¼­DTSÎļþ£ºÔÚLinuxÄÚºËÔ´ÂëÖеÄarch/arm/boot/dts/Ŀ¼ÏÂÕÒµ½¶ÔӦƽ̨µÄDTSÎļþ£¨Èçimx6qdl-pico.dtsi£© £¬Æ¾Ö¤ÏÖʵӲ¼þÐÅÏ¢±à¼­DTSÎļþ¡£

±àÒëDTSÎļþ£ºÔÚLinuxÄÚºËÔ´Âë¸ùĿ¼ÏÂÖ´ÐÐÒÔÏÂÏÂÁî±àÒëDTSÎļþ£º

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- dtbs

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ʹÓÃ×°±¸Ê÷£ºÔÚLinuxÄÚºËÆô¶¯Ê± £¬»á¼ÓÔØ×°±¸Ê÷ÎļþÀ´ÐÎòӲ¼þÐÅÏ¢ £¬´Ó¶ø׼ȷʶ±ðºÍÉèÖÃÓ²¼þ×°±¸¡£

´úÂëʾÀý

#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

static int my_driver_probe(struct platform_device *pdev)
{
    struct device_node *np = pdev->dev.of_node;
    
    if (!np) {
        dev_err(&pdev->dev, "No device tree node found
");
        return -ENODEV;
    }
    
    // ÆÊÎö×°±¸Ê÷½ÚµãÐÅÏ¢
    u32 reg;
    if (of_property_read_u32(np, "reg", &reg)) {
        dev_err(&pdev->dev, "Failed to read 'reg' property
");
        return -EINVAL;
    }
    
    dev_info(&pdev->dev, "Got 'reg' property: %u
", reg);
    
    return 0;
}

static const struct of_device_id my_driver_of_match[] = {
    { .compatible = "my_driver", },
    { },
};
MODULE_DEVICE_TABLE(of, my_driver_of_match);

static struct platform_driver my_driver = {
    .probe = my_driver_probe,
    .driver = {
        .name = "my_driver",
        .of_match_table = my_driver_of_match,
        .owner = THIS_MODULE,
    }
};

module_platform_driver(my_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Author Name");
MODULE_DESCRIPTION("Sample driver using Device Tree");

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