ＩＭＸ6Q怎么使能两个ＰＣＩＥ接口

[markhello]

请教一下，IMX6Q怎么使能两个两个pcie呢，目前我们有两个pcie接口，但只有接在一个接口上的pcie设备可以发现，另一个发现不了，其中设备描述文件相关部分如下：

imx6qdl.dtsi文件中

   pcie: pcie@0x01000000 {

                        compatible = "fsl,imx6q-pcie", "snps,dw-pcie";

                        reg = <0x01ffc000 0x04000>,

                              <0x01f00000 0x80000>;

                        reg-names = "dbi", "config";

                        #address-cells = <3>;

                        #size-cells = <2>;

                        device_type = "pci";

                        ranges = <0x00000800 0 0x01f00000 0x01f00000 0 0x00080000 /* configuration space */

                                  0x81000000 0 0          0x01f80000 0 0x00010000 /* downstream I/O */

                                  0x82000000 0 0x01000000 0x01000000 0 0x00f00000>; /* non-prefetchable memory */

                        num-lanes = <1>;

                        interrupts = <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;

                        interrupt-names = "msi";

                        #interrupt-cells = <1>;

                        interrupt-map-mask = <0 0 0 0x7>;

                        interrupt-map = <0 0 0 1 &gpc GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>,

                                        <0 0 0 2 &gpc GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>,

                                        <0 0 0 3 &gpc GIC_SPI 121 IRQ_TYPE_LEVEL_HIGH>,

                                        <0 0 0 4 &gpc GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>;

                        clocks = <&clks IMX6QDL_CLK_PCIE_AXI>,

                                 <&clks IMX6QDL_CLK_LVDS1_GATE>,

                                 <&clks IMX6QDL_CLK_PCIE_REF_125M>;

                        clock-names = "pcie", "pcie_bus", "pcie_phy";

                        status = "disabled";

                };

我们板卡的配置信息:

&pcie {

        reset-gpio = <&gpio1 20 GPIO_ACTIVE_LOW>;

        status = "okay";

};

[787316657]

您好，

      请问IMX6Q的PCIE时钟为什么只在上电后一瞬间有100MHZ时钟信号，之后一直为低，能否让CLK1_N和CLK1_P一直输出时钟信号？

谢谢！

[weidong_sun]

Hello Mark,

     i.MX6处理器，只支持一个PCIe X1 GEN2 5.0Gbps的接口，所以你无法直接连接2个PCIe设备在这个端口上。但是，你可以采用扩展的方式，首先在电路上进行实现它。

    i.MX6 PCIe--->PCIe switch(1channel root--->2--4chanel x1 switch end )，这类switch IC，PLX公司或者IDT公司有，你可以网上搜索一下，或者和他们联系一下。   纯粹在软件上，是无法实现的！

伟东