From: Mark Kettenis <kettenis@xxxxxxxxxxx> This small series adds bindings for the PCIe controller found on the Apple M1 SoC. At this point, the primary consumer for these bindings is U-Boot. With these bindings U-Boot can bring up the links for the root ports of the PCIe root complex. A simple OS driver can then provide standard ECAM access and manage MSI interrupts to provide access to the built-in Ethernet and XHCI controllers of the Mac mini. The Apple controller incorporates Synopsys Designware PCIe logic to implement its root port. But unlike other hardware currently supported by U-Boot and the Linux kernel the Apple hardware integrates multiple root ports. As such the existing bindings for the DWC PCIe interface can't be used. There is a single ECAM space for all root space, but separate GPIOs to take the PCI devices on those ports out of reset. Therefore the standard "reset-gpio" and "max-link-speed" properties appear on the child nodes representing the PCI devices that correspond to the individual root ports. MSIs are handled by the PCIe controller and translated into "regular interrupts". A range of 32 MSIs is provided. These 32 MSIs can be distributed over the root ports as the OS sees fit by programming the PCIe controller port registers. These series depends on the pinctrl series I sent earlier (with a v2 respin today). Mark Kettenis (2): dt-bindings: pci: Add DT bindings for apple,pcie arm64: apple: Add PCIe node .../devicetree/bindings/pci/apple,pcie.yaml | 150 ++++++++++++++++++ MAINTAINERS | 1 + arch/arm64/boot/dts/apple/t8103.dtsi | 64 ++++++++ 3 files changed, 215 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/apple,pcie.yaml -- 2.31.1
