The problem about xavier pcie controller C5

The xavier pcie controller C5 is disabled by default in dtb file(as is shown in the following figure) and it is connected to pcie slot on Jetson AGX xavier board. But why can it work with pcie device? It really works in my test. thanks~

dtb file:
pcie@141a0000 {
compatible = “nvidia,tegra194-pcie”, “snps,dw-pcie”;
power-domains = <0x3 0x11>;
reg = <0x0 0x141a0000 0x0 0x20000 0x0 0x3a000000 0x0 0x40000 0x0 0x3a040000 0x0 0x40000>;
reg-names = “appl”, “config”, “atu_dma”;
status = “disabled”;
#address-cells = <0x3>;
#size-cells = <0x2>;
device_type = “pci”;
num-lanes = <0x8>;
clocks = <0x4 0xe1>;
clock-names = “core_clk”;
resets = <0x5 0x82 0x5 0x81>;
reset-names = “core_apb_rst”, “core_rst”;
interrupts = <0x0 0x35 0x4 0x0 0x36 0x4>;
interrupt-names = “intr”, “msi”;
pinctrl-names = “pex_rst”, “clkreq”;
pinctrl-0 = <0x1a>;
pinctrl-1 = <0x8>;
iommus = <0x2 0x5b>;
dma-coherent;
#interrupt-cells = <0x1>;
interrupt-map-mask = <0x0 0x0 0x0 0x0>;
interrupt-map = <0x0 0x0 0x0 0x0 0x1 0x0 0x35 0x4>;
nvidia,dvfs-tbl = <0xc28cb00 0xc28cb00 0xc28cb00 0x18519600 0xc28cb00 0xc28cb00 0x18519600 0x27b25a80 0xc28
nvidia,max-speed = <0x4>;
nvidia,disable-aspm-states = <0xf>;
nvidia,controller-id = <0x3 0x5>;

See also:
https://devtalk.nvidia.com/default/topic/1048582/jetson-agx-xavier/the-problem-about-xavier-pcie-endpoint-mode/

There is override item in another dtb file. You can search pcie@141a0000 in the whole project.