[PATCH v6 0/3] usb: cdns3: Add CIX Sky1 USBSSP controller support

["Hongliang Yang (杨宏亮)" <hongliang.yang@cixtech.com>]

This series adds support for the USBSSP controllers USB4 and USB5 of
the CIX Sky1 SoC.

Patch 1 adds the device tree binding, patch 2 the glue driver, and
patch 3 the SoC nodes plus the board enablement.

The controllers are Cadence USBSSP instances. The CIX integration adds
per-controller glue registers in the SoC RCSU, an AXI bus attribute
configuration register and a controller status register, and mode strap
controls in the S5 system controller. The glue driver manages the
clocks, the resets, the strap controls and the glue registers, and then
populates the Cadence USBSSP core, which is described as a child node
at the core address.

Tested on Radxa Orion O6 (Sky1) in host mode, together with the CIX
USB3 PHY series posted separately.

The series applies on top of v7.4-rc1.

Changes in v6:
- Dropped the simple-bus RCSU container. Each controller node is now
  placed at the address of its glue registers and the Cadence USBSSP
  core is a child node at its own address.
- Replaced the usbN aliases and the undocumented id property with the
  register offset and bit position arguments of the cix,usb-syscon
  phandle.
- Documented the cix,usb-syscon arguments and allowed #syscon-cells on
  the S5 system controller binding.
- Converted the probe error paths to dev_err_probe().
- Removed the unused over-current GPIO handling and the unused dr_base
  and cdnsp_pdev fields.
- Do not disable the clocks before they have been acquired.
- Dropped the redundant depends on USB_CDNS3 and fixed the compatible
  name in the Kconfig help text.
- Reference the shared USB3 PHY through its single phandle.
- Fix the 125us prescaler value: the hardware defines it as
  time * frequency - 1.
- Make the AXI halt writes read-modify-write so the preserved and
  RW1C bits of XEC_AXI_CAP keep their state.
- Corrected the mail sender name: v5 was sent with a non-ASCII
  display name in the From header, v6 uses the plain ASCII name
  that matches the Signed-off-by.

Changes in v5:
- Added the MAINTAINERS entry for the glue driver.
- Fixed continuation line indentation reported by checkpatch.


Hongliang Yang (3):
  dt-bindings: usb: Add CIX Sky1 USBSSP controller
  usb: cdns3: Add CIX Sky1 glue driver
  arm64: dts: cix: Add USB4/USB5 nodes for Sky1

 .../soc/cix/cix,sky1-system-control.yaml      |   3 +
 .../bindings/usb/cix,sky1-usbssp.yaml         | 155 ++++
 MAINTAINERS                                   |   2 +
 arch/arm64/boot/dts/cix/sky1-orion-o6.dts     |  42 ++
 arch/arm64/boot/dts/cix/sky1.dtsi             |  85 +++
 drivers/usb/cdns3/Kconfig                     |  13 +
 drivers/usb/cdns3/Makefile                    |   1 +
 drivers/usb/cdns3/cdnsp-sky1.c                | 680 ++++++++++++++++++
 drivers/usb/cdns3/cdnsp-sky1.h                | 100 +++
 9 files changed, 1081 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/cix,sky1-usbssp.yaml
 create mode 100644 drivers/usb/cdns3/cdnsp-sky1.c
 create mode 100644 drivers/usb/cdns3/cdnsp-sky1.h


base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
prerequisite-patch-id: 2f1459f75e92d7faeb93a1e2f39d27901bea3e39
prerequisite-patch-id: 39e78ce1767908db1293c4868bc320abedacfebf
prerequisite-patch-id: 0f0fd45ae0d7cc57eb8c899a2ecb9f1efa6ebbfc