[PATCH v5 0/14] Add i.MX PCIe EP mode support

[Richard Zhu]

i.MX PCIe controller is one dual mode PCIe controller, and can work either
as RC or EP.

This series add the i.MX PCIe EP mode support. And had been verified on
i.MX8MQ EVK, i.MX8MM EVK and i.MX8MP EVK boards.

In the verification, one EVK board used as RC, the other one used as EP.
Use the cross TX/RX differential cable connect the two PCIe ports of these
two EVK boards.

+-----------+                +------------+
|   PCIe TX |<-------------->|PCIe RX     |
|           |                |            |
|EVK Board  |                |EVK Board   |
|           |                |            |
|   PCIe RX |<-------------->|PCIe TX     |
+-----------+                +------------+

Main changes from v4 -> v5:
- Rebase to v6.2-rc1.
- Follow the clock definitions on i.MX8MP platform refer to the
  following commit.
  https://patchwork.kernel.org/project/linux-arm-kernel/patch/20221216195932.3228998-1-l.stach@pengutronix.de/

Main changes from v3 -> v4:
- Add the Rob's ACK in the dt-binding patch.
- Use "i.MX" to keep spell consistent.
- Squash generic endpoint infrastructure changes of
  "[12/14] PCI: imx6: Add iMX8MM PCIe EP mode" into Kconfig changes.

NOTE:
The following commits should be cherried back firstly, when apply this
series.

Shawn's tree (git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git)
d50650500064 arm64: dts: imx8mp-evk: Add PCIe support
9e65987b9584 arm64: dts: imx8mp: Add iMX8MP PCIe support
5506018d3dec soc: imx: imx8mp-blk-ctrl: handle PCIe PHY resets

Philipp's tree (git://git.pengutronix.de/git/pza/linux)
051d9eb40388 reset: imx7: Fix the iMX8MP PCIe PHY PERST support

The PHY changes:
https://patchwork.kernel.org/project/linux-pci/cover/1664174463-13721-1-git-send-email-hongxing.zhu@nxp.com/

Main changes from v2 -> v3:
- Add the i.MX8MP PCIe EP support, and verified on i.MX8MP EVK board.
- Rebase to latest pci/next branch(tag: v6.0-rc1 plus some PCIe changes).

Main changes from v1 -> v2:
- Add Rob's ACK into first two commits.
- Rebase to the tag: pci-v5.20-changes of the pci/next branch.

Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml |   3 +++
arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi             |  14 ++++++++++++++
arch/arm64/boot/dts/freescale/imx8mm.dtsi                 |  20 +++++++++++++++++++
arch/arm64/boot/dts/freescale/imx8mp-evk.dts              |   6 ++++++
arch/arm64/boot/dts/freescale/imx8mp.dtsi                 |  26 +++++++++++++++++++++++++
arch/arm64/boot/dts/freescale/imx8mq-evk.dts              |  12 ++++++++++++
arch/arm64/boot/dts/freescale/imx8mq.dtsi                 |  27 ++++++++++++++++++++++++++
drivers/misc/pci_endpoint_test.c                          |   2 ++
drivers/pci/controller/dwc/Kconfig                        |  23 +++++++++++++++++++++-
drivers/pci/controller/dwc/pci-imx6.c                     | 200 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------
10 files changed, 314 insertions(+), 19 deletions(-)

[PATCH v5 01/14] dt-bindings: imx6q-pcie: Add i.MX8MM PCIe EP mode
[PATCH v5 02/14] dt-bindings: imx6q-pcie: Add i.MX8MQ PCIe EP mode
[PATCH v5 03/14] dt-bindings: imx6q-pcie: Add i.MX8MP PCIe EP mode
[PATCH v5 04/14] arm64: dts: Add i.MX8MM PCIe EP support
[PATCH v5 05/14] arm64: dts: Add i.MX8MM PCIe EP support on EVK board
[PATCH v5 06/14] arm64: dts: Add i.MX8MQ PCIe EP support
[PATCH v5 07/14] arm64: dts: Add i.MX8MQ PCIe EP support on EVK board
[PATCH v5 08/14] arm64: dts: Add i.MX8MP PCIe EP support
[PATCH v5 09/14] arm64: dts: Add i.MX8MP PCIe EP support on EVK board
[PATCH v5 10/14] misc: pci_endpoint_test: Add i.MX8 PCIe EP device
[PATCH v5 11/14] PCI: imx6: Add i.MX PCIe EP mode support
[PATCH v5 12/14] PCI: imx6: Add i.MX8MQ PCIe EP support
[PATCH v5 13/14] PCI: imx6: Add i.MX8MM PCIe EP support
[PATCH v5 14/14] PCI: imx6: Add i.MX8MP PCIe EP support