* Kishon Vijay Abraham I <kishon@xxxxxx> [180808 06:35]: > On Tuesday 05 June 2018 07:35 PM, Rob Herring wrote: > > Really need 64-bit addresses and sizes? Use ranges to limit the > > address space if possible. > > We now have address-cells as <1>, > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/ti/k3-am65.dtsi#n49 > > However each PCIe instance has 2 data regions and one of the regions > (PCIE0_CORE_CORE_DAT_SLV_PCIE_DAT1/PCIE1_CORE_CORE_DAT_SLV_PCIE_DAT1 specified > in the "MAIN Domain Memory Map" table of TRM http://www.ti.com/lit/pdf/spruid7) > is above the 32bit region and requires 2 cells to specify the start address. > This region is used to access MEM_SPACE of PCIe endpoint when operating in root > complex mode and access memory of PCI root complex when operating in endpoint mode. > > In order to describe this, should we change the address-cells back to <2> or do > you suggest any other alternatives? It's probably best to have the top level cbass interconnect use #size-cells = <2> and then have it's child interconnects have #size-cells = <1> if they don't need ranges above 4GB. BTW, what's the difference between all these three similar PCIE ranges? PCIE0_CORE_CORE_DAT_SLV_PCIE_CORE 0x0005500000 0x0005600000 1 MB PCIE1_CORE_CORE_DAT_SLV_PCIE_CORE 0x0005600000 0x0005700000 1 MB PCIE0_CORE_CORE_DAT_SLV_PCIE_DAT0 0x0010000000 0x0018000000 128 MB PCIE1_CORE_CORE_DAT_SLV_PCIE_DAT0 0x0018000000 0x0020000000 128 MB PCIE0_CORE_CORE_DAT_SLV_PCIE_DAT1 0x4000000000 0x4100000000 4 GB PCIE1_CORE_CORE_DAT_SLV_PCIE_DAT1 0x4100000000 0x4200000000 4 GB Regards, Tony
