PCIe Configuration Orin NX 16GB

[thomas_marangoni]

Hello,
we want to use the PCIe to connect a M.2 SSD and a GbE Phy. We have a custom pcb, but the problem is we didn’t find any documentation how to assign the correct pcie phys in the dtb.

We use following PCIe in these configurations:

• PCIe C4 as 1 lane - NX Module Pins: 133, 131, 136, 134 and 162, 160
• PCIe C7 as 2 lane - NX Module Pins: 42, 40, 48, 46, 60, 58, 66, 64 and 54, 52

How do I know which lane is connected with which phy? I couldn’t find this information in the TRM.

My devicetree for C4 currently looks like this:

pcie@14160000 {
            status = "okay";

            vddio-pex-ctl-supply = <&vdd_1v8_ao>;

            phys = <&p2u_hsio_4>, <&p2u_hsio_5>, <&p2u_hsio_6>,
			       <&p2u_hsio_7>;
			phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3";
        };

I know there are too many phys, which can be removed?

My devicetree for C7 looks like this:

v3d_pcie0: pcie@141e0000 {
            status = "okay";

            vddio-pex-ctl-supply = <&vdd_1v8_ao>;

            phys = <&p2u_gbe_0>, <&p2u_gbe_1>;
			phy-names = "p2u-0", "p2u-1";
        };

These are probably the wrong ones, I copied them from the devkit, the used the same PCIe, but with other pins.

Thanks for your help and kind regards,
Thomas

[WayneWWW]

Hi,

The reason that it does not have anything listed in the document is because this thing is the default setting. You don’t need to change anything.

C4 is whether 1 lane or 4 lane does not matter. The driver has compatibility to support 1 lane even the software setting is 4 lane.