A bunch of changes to refine i.MX PCIe driver.
- Add ref clock gate for i.MX95 PCIe.
  The changes of clock part are here [1], and had been applied by Abel.
  [1] https://lkml.org/lkml/2024/10/15/390
- Clean i.MX PCIe driver by removing useless codes.
  Patch #3 depends on dts changes. And the dts changes had been applied
  by Shawn, there is no dependecy now.
- Make core reset and enable_ref_clk symmetric for i.MX PCIe driver.
- Use dwc common suspend resume method, and enable i.MX8MQ, i.MX8Q and
  i.MX95 PCIe PM supports.

v6 changes:
Thanks for Frank's comments.
- Add optional clk fetch, without losting safty check.
- Update commit message in #3 and #8 patch of v6
- Add previous discussion as annotation into #4 patch.

v5 changes:
Thanks for Manivannan's review.
- To avoid the DT compatibility on i.MX95, let to fetch i.MX95 PCIe clocks be
  optinal in driver.
- Add Fixes tags into #5 and #6 patches.
- Split the clean up codes into #7 in v5.
- Update the commit message in #10, and #8
  "PCI: imx6: Use dwc common suspend resume method" patches.

v4 changes:
It's my fault that I missing Manivanna in the reviewer list.
I'm sorry about that.
- Rebase to v6.12-rc3, and resolve the dtsi conflictions.
  Add Manivanna into reviewer list.

v3 changes:
- Update EP binding refer to comments provided by Krzysztof Kozlowski.
  Thanks.

v2 changes:
- Add the reasons why one more clock is added for i.MX95 PCIe in patch #1.
- Add the "Reviewed-by: Frank Li <Frank.Li@nxp.com>" into patch #2, #4, #5,
  #6, #8 and #9.

[PATCH v6 01/10] dt-bindings: imx6q-pcie: Add ref clock for i.MX95
[PATCH v6 02/10] PCI: imx6: Add ref clock for i.MX95 PCIe
[PATCH v6 03/10] PCI: imx6: Fetch dbi2 and iATU base addesses from DT
[PATCH v6 04/10] PCI: imx6: Correct controller_id generation logic
[PATCH v6 05/10] PCI: imx6: Make core reset assertion deassertion
[PATCH v6 06/10] PCI: imx6: Fix the missing reference clock disable
[PATCH v6 07/10] PCI: imx6: Clean up codes by removing
[PATCH v6 08/10] PCI: imx6: Use dwc common suspend resume method
[PATCH v6 09/10] PCI: imx6: Add i.MX8MQ i.MX8Q and i.MX95 PCIe PM
[PATCH v6 10/10] arm64: dts: imx95: Add ref clock for i.MX95 PCIe

Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-common.yaml |   4 +-
Documentation/devicetree/bindings/pci/fsl,imx6q-pcie-ep.yaml     |   1 +
Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml        |  25 +++++++++--
arch/arm64/boot/dts/freescale/imx95.dtsi                         |  18 ++++++--
drivers/pci/controller/dwc/pci-imx6.c                            | 174 ++++++++++++++++++++++++++++------------------------------------------------
5 files changed, 102 insertions(+), 120 deletions(-)