[PATCH v2 0/7] Add the iMX8MP PCIe support

[Richard Zhu <hongxing.zhu@nxp.com>]

Based on the i.MX8MP GPC and blk-ctrl patch-set[1] issued by Lucas and the
following commits.
  - one codes refine patch-set[5].
  - two Fixes[2],[3].
  - one binding commit[4].
  - some dts changes in Shawn's git if you want to test PCIe on i.MX8MM EVK.
    b4d36c10bf17 arm64: dts: imx8mm-evk: Add the pcie support on imx8mm evk board
    aaeba6a8e226 arm64: dts: imx8mm: Add the pcie support
    cfc5078432ca arm64: dts: imx8mm: Add the pcie phy support

Sorry about that there may be some conflictions when do the codes merge.
I'm waiting for the ack now, and will re-base them in a proper sequence later.

This series patches add the i.MX8MP PCIe support and tested on i.MX8MM EVK and
i.MX8MP EVk boards. The PCIe NVME works fine on both boards.

- i.MX8MP PCIe PHY has two resets refer to the i.MX8MM PCIe PHY.
  Add one more PHY reset for i.MX8MP PCIe PHY accordingly.
- Add the i.MX8MP PCIe PHY support in the i.MX8M PCIe PHY driver.
  And share as much as possible codes with i.MX8MM PCIe PHY.
- Add the i.MX8MP PCIe support in binding document, DTS files, and PCIe
  driver.

Main changes v1-->v2:
- It's my fault forget including Vinod, re-send v2 after include Vinod
  and linux-phy@lists.infradead.org.
- List the basements of this patch-set. The branch, codes changes and so on.
- Clean up some useless register and bit definitions in #3 patch.

[1]https://patchwork.kernel.org/project/linux-arm-kernel/cover/20220228201731.3330192-1-l.stach@pengutronix.de/
[2]https://patchwork.ozlabs.org/project/linux-pci/patch/1646289275-17813-1-git-send-email-hongxing.zhu@nxp.com/
[3]https://patchwork.ozlabs.org/project/linux-pci/patch/1645672013-8949-1-git-send-email-hongxing.zhu@nxp.com/
[4]https://patchwork.ozlabs.org/project/linux-pci/patch/1646293805-18248-1-git-send-email-hongxing.zhu@nxp.com/
[5]https://patchwork.ozlabs.org/project/linux-pci/cover/1645760667-10510-1-git-send-email-hongxing.zhu@nxp.com/

NOTE:
Based git <git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git>
Based branch <pci/imx6>

Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml    |   1 +
Documentation/devicetree/bindings/phy/fsl,imx8-pcie-phy.yaml |   4 +-
arch/arm64/boot/dts/freescale/imx8mp-evk.dts                 |  55 ++++++++++++++++++++++
arch/arm64/boot/dts/freescale/imx8mp.dtsi                    |  46 ++++++++++++++++++-
drivers/pci/controller/dwc/pci-imx6.c                        |  19 +++++++-
drivers/phy/freescale/phy-fsl-imx8m-pcie.c                   | 205 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------
drivers/reset/reset-imx7.c                                   |   1 +
7 files changed, 286 insertions(+), 45 deletions(-)

[PATCH v2 1/7] reset: imx7: Add the iMX8MP PCIe PHY PERST support
[PATCH v2 2/7] dt-binding: phy: Add iMX8MP PCIe PHY binding
[PATCH v2 3/7] phy: freescale: imx8m-pcie: Add iMX8MP PCIe PHY
[PATCH v2 4/7] dt-bindings: imx6q-pcie: Add iMX8MP PCIe compatible
[PATCH v2 5/7] arm64: dts: imx8mp: add the iMX8MP PCIe support
[PATCH v2 6/7] arm64: dts: imx8mp-evk: Add PCIe support
[PATCH v2 7/7] PCI: imx6: Add the iMX8MP PCIe support