Renesas HW team replied to me that there are no clock, reset, or interrupt
signals dedicated specifically to the Root Port. All these signals are
shared across the PCIe system.
Taking this and your suggestions into account, I have prepared the following
device tree:
pcie: pcie@11e40000 {
compatible = "renesas,r9a08g045-pcie";
reg = <0 0x11e40000 0 0x10000>;
ranges = <0x02000000 0 0x30000000 0 0x30000000 0 0x8000000>;
/* Map all possible DRAM ranges (4 GB). */
dma-ranges = <0x42000000 0 0x40000000 0 0x40000000 0x1 0x0>;
bus-range = <0x0 0xff>;
interrupts = <GIC_SPI 395 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 396 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 397 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 398 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 399 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 400 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 401 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 402 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 403 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 404 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 405 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 406 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 407 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 408 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 409 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 410 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "serr", "serr_cor", "serr_nonfatal",
"serr_fatal", "axi_err", "inta",
"intb", "intc", "intd", "msi",
"link_bandwidth", "pm_pme", "dma",
"pcie_evt", "msg", "all";
#interrupt-cells = <1>;
interrupt-controller;
interrupt-map-mask = <0 0 0 7>;
interrupt-map = <0 0 0 1 &pcie 0 0 0 0>, /* INTA */
<0 0 0 2 &pcie 0 0 0 1>, /* INTB */
<0 0 0 3 &pcie 0 0 0 2>, /* INTC */
<0 0 0 4 &pcie 0 0 0 3>; /* INTD */
clocks = <&cpg CPG_MOD R9A08G045_PCI_ACLK>,
<&cpg CPG_MOD R9A08G045_PCI_CLKL1PM>;
clock-names = "aclk", "pm";
resets = <&cpg R9A08G045_PCI_ARESETN>,
<&cpg R9A08G045_PCI_RST_B>,
<&cpg R9A08G045_PCI_RST_GP_B>,
<&cpg R9A08G045_PCI_RST_PS_B>,
<&cpg R9A08G045_PCI_RST_RSM_B>,
<&cpg R9A08G045_PCI_RST_CFG_B>,
<&cpg R9A08G045_PCI_RST_LOAD_B>;
reset-names = "aresetn", "rst_b", "rst_gp_b", "rst_ps_b",
"rst_rsm_b", "rst_cfg_b", "rst_load_b";
power-domains = <&cpg>;
device_type = "pci";
#address-cells = <3>;
#size-cells = <2>;
renesas,sysc = <&sysc>;
status = "disabled";
pcie_port0: pcie@0,0 {
reg = <0x0 0x0 0x0 0x0 0x0>;
ranges;
clocks = <&versa3 5>;
clock-names = "ref";
device_type = "pci";
vendor-id = <0x1912>;
device-id = <0x0033>;
bus-range = <0x1 0xff>;
