参考链接：https://elinux.org/Device_Tree_Usage#PCI_Host_Bridge
pcie bar高低端BAR起始地址介绍
pcie设备树节点
/ {compatible = "rockchip,rk3588";interrupt-parent = <&gic>;#address-cells = <2>;#size-cells = <2>;pcie3x4: pcie@fe150000 {compatible = "rockchip,rk3588-pcie", "snps,dw-pcie";#address-cells = <3>;#size-cells = <2>;bus-range = <0x00 0x0f>;clocks = <&cru ACLK_PCIE_4L_MSTR>, <&cru ACLK_PCIE_4L_SLV>,<&cru ACLK_PCIE_4L_DBI>, <&cru PCLK_PCIE_4L>,<&cru CLK_PCIE_AUX0>, <&cru CLK_PCIE4L_PIPE>;clock-names = "aclk_mst", "aclk_slv","aclk_dbi", "pclk","aux", "pipe";device_type = "pci";interrupts = <GIC_SPI 263 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 262 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 261 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 260 IRQ_TYPE_LEVEL_HIGH>,<GIC_SPI 259 IRQ_TYPE_LEVEL_HIGH>;interrupt-names = "sys", "pmc", "msg", "legacy", "err";#interrupt-cells = <1>;interrupt-map-mask = <0 0 0 7>;interrupt-map = <0 0 0 1 &pcie3x4_intc 0>,<0 0 0 2 &pcie3x4_intc 1>,<0 0 0 3 &pcie3x4_intc 2>,<0 0 0 4 &pcie3x4_intc 3>;linux,pci-domain = <0>;num-ib-windows = <16>;num-ob-windows = <16>;num-viewport = <8>;max-link-speed = <3>;msi-map = <0x0000 &its1 0x0000 0x1000>;num-lanes = <4>;phys = <&pcie30phy>;phy-names = "pcie-phy";power-domains = <&power RK3588_PD_PCIE>;ranges = <0x00000800 0x0 0xf0000000 0x0 0xf0000000 0x0 0x1000000x81000000 0x0 0xf0100000 0x0 0xf0100000 0x0 0x1000000x82000000 0x0 0xf0200000 0x0 0xf0200000 0x0 0xe000000xc3000000 0x9 0x00000000 0x9 0x00000000 0x0 0x40000000>;reg = <0x0 0xfe150000 0x0 0x10000>,<0xa 0x40000000 0x0 0x400000>;reg-names = "pcie-apb", "pcie-dbi";resets = <&cru SRST_PCIE0_POWER_UP>, <&cru SRST_P_PCIE0>;reset-names = "pcie", "periph";rockchip,pipe-grf = <&php_grf>;status = "disabled";pcie3x4_intc: legacy-interrupt-controller {interrupt-controller;#address-cells = <0>;#interrupt-cells = <1>;interrupt-parent = <&gic>;interrupts = <GIC_SPI 260 IRQ_TYPE_EDGE_RISING>;};};
};ranges = <子节点#address-cells 父节点#address-cells 子节点#size-cells>;
ranges = <3个字长(32位) 2个字长(32位) 2个字长(32位)>;
ranges = <0x00000800 0x0 0xf0000000 0x0 0xf0000000 0x0 0x100000 //表示外设配置空间，将PCIE地址0xf0000000大小1MB映射到CPU地址0xf0000000上。0x81000000 0x0 0xf0100000 0x0 0xf0100000 0x0 0x100000 //表示I/O空间，将PCIE地址0xf0100000大小1MB映射到CPU地址0xf0100000上。0x82000000 0x0 0xf0200000 0x0 0xf0200000 0x0 0xe00000 //表示32位内存空间，将PCIE地址0xf0200000大小14MB映射到CPU地址0xf0200000上。0xc3000000 0x9 0x00000000 0x9 0x00000000 0x0 0x40000000>; //表示64位内存空间，将PCIE地址0x900000000大小1GB映射到CPU地址0x900000000上。
保留内存
reserved-memory {#address-cells = <2>;#size-cells = <2>;ranges;dma_trans: dma-trans@3c000000 {reg = <0x0 0x3c000000 0x0 0x04000000>;};/* Reserve 256MB memory for hdmirx-controller@fdee0000 */cma {compatible = "shared-dma-pool";reusable;reg = <0x0 (256 * 0x100000) 0x0 (256 * 0x100000)>;linux,cma-default;};pcie3x4_range: pcie3x4-range@30000000 {reg = <0x0 0xdfe00000 0x0 0x10200000>; //定义一个名为 pcie3x4_range 的 PCIe 设备，其内存映射从地址 0xdfe00000 开始，大小为 0x10200000 字节，映射到目标地址区域 0x30000000。};
};
