[RFC v4 0/5] Add multiport support for DWC3 controllers

[Krishna Kurapati]

Currently the DWC3 driver supports only single port controller which
requires at most two PHYs ie HS and SS PHYs. There are SoCs that has
DWC3 controller with multiple ports that can operate in host mode.
Some of the port supports both SS+HS and other port supports only HS
mode.

This change primarily refactors the Phy logic in core driver to allow
multiport support with Generic Phy's.

Chananges have been tested on  QCOM SoC SA8295P which has 4 ports (2
are HS+SS capable and 2 are HS only capable).

Changes in v4:
Added DT support for SA8295p.

Changes in v3:
Incase any PHY init fails, then clear/exit the PHYs that
are already initialized.

Changes in v2:
Changed dwc3_count_phys to return the number of PHY Phandles in the node.
This will be used now in dwc3_extract_num_phys to increment num_usb2_phy 
and num_usb3_phy.

Added new parameter "ss_idx" in dwc3_core_get_phy_ny_node and changed its
structure such that the first half is for HS-PHY and second half is for
SS-PHY.

In dwc3_core_get_phy, for multiport controller, only if SS-PHY phandle is
present, pass proper SS_IDX else pass -1.

Link to v3: https://lore.kernel.org/all/1654709787-23686-1-git-send-email-quic_harshq@xxxxxxxxxxx/#r
Link to v2: https://lore.kernel.org/all/1653560029-6937-1-git-send-email-quic_harshq@xxxxxxxxxxx/#r

Krishna Kurapati (5):
  dt-bindings: usb: Add bindings to support multiport properties
  usb: dwc3: core: Refactor PHY logic to support Multiport Controller
  usb: dwc3: core: Do not setup event buffers for host only controllers
  usb: dwc3: qcom: Add multiport controller support for qcom wrapper
  arm: dts: msm: Add multiport controller node for usb

 .../devicetree/bindings/usb/snps,dwc3.yaml    |  42 ++-
 arch/arm64/boot/dts/qcom/sa8295p-adp.dts      |  49 +++
 arch/arm64/boot/dts/qcom/sc8280xp.dtsi        |  60 ++++
 drivers/usb/dwc3/core.c                       | 325 +++++++++++++-----
 drivers/usb/dwc3/core.h                       |  15 +-
 drivers/usb/dwc3/drd.c                        |  14 +-
 drivers/usb/dwc3/dwc3-qcom.c                  |  28 +-
 7 files changed, 429 insertions(+), 104 deletions(-)

-- 
2.39.0