[v2,0/3] Cleanup Octeon DWC3 glue code

Message

Ladislav Michl July 2, 2023, 12:15 a.m. UTC

Hi,

primary motivation was to fix issue Id 29206 as described in
OCTEON III CN70XX/CN71XX Known Issues, version: 1.9.
Said document is marked as Marvell Proprietary and Confidential,
therefore I'm not sure if I can cite from it.

This probably does not matter too much as the root of the information
listed there is a workaround being implemented in OCTEON SDK 3.1.2
patch 7 and later in
u-boot/drivers/usb/host/xhci-octeon.c:dwc3_uphy_pll_reset()

My coleague ported that patch to linux-4.9 and I will later modify
it to work on top of current glue driver.

The glue code currently lives in arch/mips/cavium-octeon/octeon-usb.c
and loops for each "cavium,octeon-7130-usb-uctl" compatible.
However there is no bond with dwc3 core code, so if anything goes
wrong in glue code, the loop breaks, leaving dwc3 in reset.

Later on when dwc3 core tries to read any device register, bus error
is emited, leading to kernel panic.

Therefore move it to drivers/usb/dwc3 while making it glue driver.

This is a second attempt, see changelog appended to patches.

Ladislav Michl (3):
  usb: dwc3: dwc3-octeon: Convert to glue driver
  usb: dwc3: dwc3-octeon: Move node parsing into driver probe
  usb: dwc3: Add SPDX header and copyright

 arch/mips/cavium-octeon/Makefile              |   1 -
 arch/mips/cavium-octeon/octeon-platform.c     |   1 -
 drivers/usb/dwc3/Kconfig                      |  10 +
 drivers/usb/dwc3/Makefile                     |   1 +
 .../usb/dwc3/dwc3-octeon.c                    | 262 +++++++++---------
 drivers/usb/dwc3/dwc3-of-simple.c             |   1 -
 6 files changed, 142 insertions(+), 134 deletions(-)
 rename arch/mips/cavium-octeon/octeon-usb.c => drivers/usb/dwc3/dwc3-octeon.c (80%)