Messages in this thread |  | | From | Mark Kettenis <> | Subject | [PATCH v2 0/2] Apple M1 PCIe DT bindings | Date | Mon, 31 May 2021 00:43:59 +0200 |
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From: Mark Kettenis <kettenis@openbsd.org>
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.
I still hope to hear from Marc Zyngier on the way MSIs are represented in this binding.
Patch 2/2 of this series depends on the pinctrl series I sent earlier.
Changelog:
v2: - Adjust name for ECAM in "reg-names" - Drop "phy" registers - Expand description - Add description for "interrupts" - Fix incorrect minItems for "interrupts" - Fix incorrect MaxItems for "reg-names" - Document the use of "msi-controller", "msi-parent", "iommu-map" and "iommu-map-mask" - Fix "bus-range" and "iommu-map" properties in the example
Mark Kettenis (2): dt-bindings: pci: Add DT bindings for apple,pcie arm64: apple: Add PCIe node
.../devicetree/bindings/pci/apple,pcie.yaml | 167 ++++++++++++++++++ MAINTAINERS | 1 + arch/arm64/boot/dts/apple/t8103.dtsi | 63 +++++++ 3 files changed, 231 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/apple,pcie.yaml
-- 2.31.1
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