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Subject[PATCH v2 0/6] Add PCI driver for the Apple M1
This adds a PCIe driver for the internal bus on the Apple M1 (and
presumably other Apple system-on-chips). It's based on the work of Marc
Zyngier, Mark Kettenis, and Stan Skowronek (Corellium). In conjunction
with a pinctrl driver, this enables the USB type-A ports and the
Ethernet port. It also paves the way for Wi-Fi and Bluetooth, but that
requires further work.

For the largest change since v1 of the series-- this now uses Mark
Kettenis's device tree bindings for PCIe. This series contains Mark's
patches (currently under discussion on the LKML) adding the device tree
nodes required for PCIe. I have made minor modifications to Mark's
original patches to get everything working under Linux:

* In the bindings themselves, I've increased the maximum number of
interrupts to accommodate the full set.
* In the PCIe node, I've added the full set of interrupts.
* I've added the PCIe DART nodes (IOMMUs) and the corresponding
iommu-map(-mask) properties already covered in the bindings.
* I've tweaked the sizes of the `reg` blocks. Otherwise I got a page
fault early on.

I've collected the patches required to test on this branch:

This branch is based on linux-next and contains a GPIO (pinctrl) driver,
a clock gate driver, additional device tree nodes, and this series. The
type-A ports and Ethernet should work out-of-the-box on that tree,
provided the kernel is booted through m1n1. This improves on Maz's
initial PCIe driver, which required U-Boot to function.

I've started using Linux on M1 as my workstation for Panfrost
development, so this should have 40 hours of testing by this time next

== Project Blurb ==

Asahi Linux is an open community project dedicated to developing and
maintaining mainline support for Apple Silicon on Linux. Feel free to
drop by #asahi and #asahi-dev on OFTC to chat with us, or check
our website for more information on the project:

== Changes ==

Changes for v2:
- Cherrypicked Mark's device tree bindings and switched to using them.
- Split up the PCI driver patch into 3.
- Large numbers of minor changes to the driver better match upstream
quality standards (using more helper functions, etc.)

Alyssa Rosenzweig (3):
PCI: apple: Add initial hardware bring-up
PCI: apple: Set up reference clocks when probing
PCI: apple: Add MSI handling

Mark Kettenis (3):
dt-bindings: pci: Add DT bindings for apple,pcie
arm64: apple: Add pinctrl nodes
arm64: apple: Add PCIe node

.../devicetree/bindings/pci/apple,pcie.yaml | 166 +++++++
arch/arm64/boot/dts/apple/t8103.dtsi | 207 ++++++++
drivers/pci/controller/Kconfig | 12 +
drivers/pci/controller/Makefile | 1 +
drivers/pci/controller/pcie-apple.c | 448 ++++++++++++++++++
6 files changed, 841 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pci/apple,pcie.yaml
create mode 100644 drivers/pci/controller/pcie-apple.c


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