[PATCH v5 0/3] Add QMP PCIe multiple link-mode PHY support

[Qiang Yu]

Hi all,

Some QMP PCIe PHY hardware blocks can be configured through a link-mode
register into different link topologies, such as a single wide link, or
multiple independent narrower links (e.g. x8 or x4+x4 mode on the Glymur
PCIe3 PHY).

Earlier revisions tried to extend the existing single-instance
phy-qcom-qmp-pcie.c driver to cover this hardware. That added a large
amount of conditional, multi-PHY logic to a driver whose data model
assumes one PHY per node.

This series adds a dedicated PHY provider driver,
phy-qcom-qmp-pcie-multiphy.c:

A single PHY provider node describes the shared hardware block. A new
"qcom,link-mode" property points at the TCSR syscon register that reports
the active topology; the driver reads it once at probe. #phy-cells = <1>
lets consumers pass a logical PHY index to obtain their sub-PHY. Match
data is indexed by link mode, and each link mode has its own array of
per-PHY config tables, so one shared provider exposes a different set of
logical PHYs depending on the active mode. The driver inherits the PHY
settings and link mode already programmed by UEFI, so only the no-CSR
reset is used, and no PHY setting tables or related structures are
defined. Each sub-PHY owns its register regions and power domain, so in a
bifurcated mode the links are brought up, and powered independently.

The driver is implemented and validated on Glymur, and is intended to
be extensible to other multi-mode QMP PCIe PHYs.

This series depends on a prerequisite patch by Krzysztof Kozlowski:
https://lore.kernel.org/r/20260420133616.88740-2-krzysztof.kozlowski@xxxxxxxxxxxxxxxx

Thanks,
Qiang

Signed-off-by: Qiang Yu <qiang.yu@xxxxxxxxxxxxxxxx>
---
Changes in v5:
- Split the Glymur multi PHY binding out of the shared qcom,sc8280xp-qmp-pcie-phy.yaml into its own schema.
- Reworked phy-qcom-qmp-pcie-multiphy.c into a standalone driver instead of extending phy-qcom-qmp-pcie.c with conditional multi-PHYlogic.
- Dropped the "link mode value" cell from qcom,link-mode.
- Removed the QMP_PHY_SELECTOR_0/1 dt-bindings macros.
- Link to v4: https://lore.kernel.org/all/20260518-link_mode_0519-v4-0-269cd73cc5d1@xxxxxxxxxxxxxxxx/

Changes in v4:
- Replaced the static bifurcation probe model with a link-mode
  architecture: the active topology (x8 or x4+x4) is selected via a
  new "qcom,link-mode" DT property and written to a TCSR register at
  power-on. This replaces v3 patches 4 and 5 with four new patches
  (driver refactor, secondary PHY clock/reset lists, link-mode probe
  infrastructure, and Glymur config).
- Updated dt-bindings to describe "qcom,link-mode", #phy-cells = <1>,
  per-mode validation rules, and added a new header with
  QMP_PHY_SELECTOR_* and QMP_PCIE_GLYMUR_MODE_* macros.
- Patches 2 and 3 (multiple power-domains, multiple nocsr resets) are
  unchanged from v3.
- Link to v3: https://lore.kernel.org/r/20260412-glymur_gen5x8_phy_0413-v3-0-affcebc16b8b@xxxxxxxxxxxxxxxx

Changes in v3:
- Add description of each power-domain.
- Add 64bit prefetchable memory range required by some EPs eg. AI100 ultra.
- Move PCIe3a after PCIe3b and move PCIe3a PHY before PCIe3b PHY.
- Link to v2: https://lore.kernel.org/all/20260323-glymur_gen5x8_phy_0323-v2-0-ce0fc07f0e52@xxxxxxxxxxxxxxxx/

Changes in v2:
- Remove pd_list from qmp_pcie struct as it is not used in phy driver.
- align clk-names on "
- Link to v1: https://lore.kernel.org/all/20260304-glymur_gen5x8_phy-v1-0-849e9a72e125@xxxxxxxxxxxxxxxx/

To: Vinod Koul <vkoul@xxxxxxxxxx>
To: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
To: Rob Herring <robh@xxxxxxxxxx>
To: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
To: Conor Dooley <conor+dt@xxxxxxxxxx>
To: Qiang Yu <qiang.yu@xxxxxxxxxxxxxxxx>
To: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxxxxxxxx>
To: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
To: Bjorn Andersson <andersson@xxxxxxxxxx>
To: Konrad Dybcio <konradybcio@xxxxxxxxxx>
Cc: linux-arm-msm@xxxxxxxxxxxxxxx
Cc: linux-phy@xxxxxxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

---
Qiang Yu (3):
      dt-bindings: phy: qcom: Add Glymur QMP PCIe multiple link-mode PHY
      phy: qcom: qmp-pcie: Add QMP PCIe Multi-PHY driver
      arm64: dts: qcom: glymur: Wire PCIe3a/3b to shared Gen5x8 PHY

 .../phy/qcom,glymur-qmp-pcie-multiphy.yaml         | 176 +++++
 arch/arm64/boot/dts/qcom/glymur-crd.dtsi           |   8 +
 arch/arm64/boot/dts/qcom/glymur.dtsi               | 336 ++++++++-
 drivers/phy/qualcomm/Kconfig                       |  11 +
 drivers/phy/qualcomm/Makefile                      |   1 +
 drivers/phy/qualcomm/phy-qcom-qmp-pcie-multiphy.c  | 770 +++++++++++++++++++++
 6 files changed, 1300 insertions(+), 2 deletions(-)
---
base-commit: 59ccadbf59aedee486fce5b4a5486a07c3f4b5d3
change-id: 20260716-glymur_linkmode_0717-70eacf08a5c5

Best regards,
--  
Qiang Yu <qiang.yu@xxxxxxxxxxxxxxxx>