[PATCH v2 0/8] imx8mp: Enable PCIe/NVMe support

[Sumit Garg]

pcie_imx doesn't seem to share any useful code for iMX8MP SoC and it is
rather tied to quite old port of pcie_designware driver from Linux which
suffices only iMX6 specific needs.

But currently we have the common DWC specific bits which alligns pretty
well with DW PCIe controller on iMX8MP SoC. So lets reuse those common
bits instead as a new driver for iMX8 SoCs. It should be fairly easy to
add support for other iMX8 variants to this driver.

iMX8MP SoC also comes up with standalone PCIe PHY support, so hence we
can reuse the generic PHY infrastructure to power on PCIe PHY.

Patch #1: Adds PCIe clocks support.
Patch #2: Adds i.MX8MP reset controller support.
Patch #3: Extend i.MX8MP power domain driver with PCIe support
Patch #4: Expose high performance PLL clock required for PCIe PHY
          on verdin board.
Patch #5: Adds standalone PCIe PHY support for i.MX8MP SoC.
Patch #6: Adds DW PCIe controller support for iMX8MP SoC.
Patch #7: Enable PCIe/NVMe support for verdin board.

Testing with this patch-set included:

Verdin iMX8MP # pci enum
PCIE-0: Link up (Gen1-x1, Bus0)
Verdin iMX8MP # 
Verdin iMX8MP # nvme scan
Verdin iMX8MP # 
Verdin iMX8MP # nvme info
Device 0: Vendor: 0x126f Rev: T0828A0  Prod: AA000000000000000720
            Type: Hard Disk
            Capacity: 122104.3 MB = 119.2 GB (250069680 x 512)
Verdin iMX8MP # 
Verdin iMX8MP # load nvme 0 $loadaddr <file-name>

Changes in v2:
- Renamed PCIe IMX driver pcie_dw_imx8.c -> pcie_dw_imx.c.
- Added myself as maintainer for PCIe DWC IMX driver support.
- Incorporated various code and commit message improvement suggestions
  from Marek, thanks.
- Patch#3: Gate PCIe and USB clocks behind corresponding power domain
  IDs.
- Patch#4: Expose HSIO PLL clocks as a regular clock driver instead
  similar to what Linux kernel does.
- Patch#7: Picked up tags.

Sumit Garg (8):
  clk: imx8mp: Add support for PCIe clocks
  reset: imx: Add support for i.MX8MP reset controller
  imx8mp: power-domain: Add PCIe support
  imx8mp: power-domain: Expose high performance PLL clock
  phy: phy-imx8m-pcie: Add support for i.MX8M{M/P} PCIe PHY
  pci: Add DW PCIe controller support for iMX8MP SoC
  verdin-imx8mp_defconfig: Enable PCIe/NVMe support
  MAINTAINERS: Add entry for PCIe DWC IMX driver

 MAINTAINERS                           |   6 +
 configs/verdin-imx8mp_defconfig       |   6 +
 drivers/clk/imx/clk-imx8mp.c          |   6 +
 drivers/pci/Kconfig                   |   8 +
 drivers/pci/Makefile                  |   1 +
 drivers/pci/pcie_dw_imx.c             | 314 ++++++++++++++++++++++++++
 drivers/phy/Kconfig                   |   9 +
 drivers/phy/Makefile                  |   1 +
 drivers/phy/phy-imx8m-pcie.c          | 269 ++++++++++++++++++++++
 drivers/power/domain/imx8mp-hsiomix.c | 179 +++++++++++++--
 drivers/reset/reset-imx7.c            | 114 ++++++++++
 11 files changed, 890 insertions(+), 23 deletions(-)
 create mode 100644 drivers/pci/pcie_dw_imx.c
 create mode 100644 drivers/phy/phy-imx8m-pcie.c

-- 
2.34.1