Question

在此代码中，内核代码需要/ amba @ 0 / ps7-ethernet @ e000c000 / mdio中的兼容字符串。

它从不执行printk（KERN_ERR“ ... cp是=％s \ r \ n”，cp）;
我的问题是设备树的正确方法应该是什么，以便它可以找到mdio子级并找到兼容的字符串。而且，它不应破坏现有功能。

static int of_get_phy_id(struct device_node *device, u32 *phy_id)
{
    struct property *prop;
    const char *cp;
    unsigned int upper, lower;
        int i = 0;
        printk(KERN_ERR "... get Ethernet PHY ID");

        if(device->name != NULL)
          {
               printk(KERN_ERR "...type = %s",device->type);
               printk(KERN_ERR "...type = %s",device->full_name);
               printk(KERN_ERR "...property name = %s",device->properties->name);

          }

    // never enters here......   
    of_property_for_each_string(device, "compatible", prop, cp) {

                printk(KERN_ERR "...the cp is = %s \r\n", cp);
                printk(KERN_ERR "...the prop is = %s \r\n", prop->name);

        if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
            *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
                          printk(KERN_ERR "...the phy id is = %d \r\n", *phy_id );
            return 0;
        }

         }
         printk(KERN_ERR "...ERROR... get Phy ID \r\n");
    return -EINVAL;
}

...type = <NULL>
...type = /amba@0/ps7-ethernet@e000c000/mdio
...property name = #address-cells
...ERROR... get Phy ID

这是Yocto的zynq-7000.dtsi 我的DTS看起来像-

amba: amba {
        compatible = "simple-bus";
        #address-cells = <1>;
        #size-cells = <1>;
        interrupt-parent = <&intc>;
        ranges;

        adc: adc@f8007100 {
            compatible = "xlnx,zynq-xadc-1.00.a";
            reg = <0xf8007100 0x20>;
            interrupts = <0 7 4>;
            interrupt-parent = <&intc>;
            clocks = <&clkc 12>;
        };

        gem0: ethernet@e000b000 {
            compatible = "cdns,zynq-gem", "cdns,gem";
            reg = <0xe000b000 0x1000>;
            status = "disabled";
            interrupts = <0 22 4>;
            clocks = <&clkc 30>, <&clkc 30>, <&clkc 13>;
            clock-names = "pclk", "hclk", "tx_clk";
            #address-cells = <1>;
            #size-cells = <0>;
        };

        gem1: ethernet@e000c000 {
             compatible = "cdns,zynq-gem", "cdns,gem";
             reg = <0xe000c000 0x1000>;
             status = "disabled";
             interrupts = <0 45 4>;
             clocks = <&clkc 31>, <&clkc 31>, <&clkc 14>;
             clock-names = "pclk", "hclk", "tx_clk";
             #address-cells = <1>;
             #size-cells = <0>;
        };
     };

此处正确的设备树文件应该是什么？

0 个答案: