[PATCH 0/3] Add PCIe Gen2x1 controller support for RK3528

[Yao Zi <ziyao@disroot.org>]

Rockchip RK3528 ships one PCIe Gen2x1 controller that operates in RC
mode only. The SoC doesn't provide a separate MSI controller, thus the
one integrated in designware PCIe IP must be used. This series documents
the PCIe controller in dt-binding and describes it in the SoC devicetree.

Radxa E20C board is used for testing, whose LAN GbE port is provided
through an RTL8111H chip connected to PCIe controller. Its devicetree
is adjusted to enable the controller, and IPERF3 shows the interface
runs at full-speed. A typical result looks like

[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.09 GBytes   936 Mbits/sec    0            sender
[  5]   0.00-10.00  sec  1.09 GBytes   934 Mbits/sec                  receiver

This series is based on next-20250905. It's worth noting that
commit 727e914bbfbb ("PCI/MSI: Check MSI_FLAG_PCI_MSI_MASK_PARENT in
cond_[startup|shutdown]_parent()") (already contained in next-20250905)
is necessary for normal operation of designware PCIe IP's integrated MSI
controller.

Thanks for your time and review.

Yao Zi (3):
  dt-bindings: PCI: dwc: rockchip: Add RK3528 variant
  arm64: dts: rockchip: Add PCIe Gen2x1 controller for RK3528
  arm64: dts: rockchip: Enable PCIe controller on Radxa E20C

 .../bindings/pci/rockchip-dw-pcie.yaml        |  3 +
 .../boot/dts/rockchip/rk3528-radxa-e20c.dts   | 17 ++++++
 arch/arm64/boot/dts/rockchip/rk3528.dtsi      | 56 ++++++++++++++++++-
 3 files changed, 75 insertions(+), 1 deletion(-)

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