[PATCH v18 0/2] phy: qcom: add the SGMII SerDes PHY for firmware-managed systems

Tue Nov 3 02:35:51 PST 2026

Vinod: Sorry for the noise but sashiko pointed out I forgot about one
comment from Krzysztof. This still should be good to go, there were no
more sashiko comments and this is just a rebase + a commit message tweak.

Add support for the firmware-managed variant of the Serdes PHY present
on the Qualcomm sa8255p platforms.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski at oss.qualcomm.com>
---
Changes in v18:
- Drop power-domain-names (Krzysztof)
- Link to v17: https://patch.msgid.link/20261102-sa8255p-eth-phy-v17-0-aa138f2912a0@oss.qualcomm.com

Changes in v17:
- Extended the commit message for patch 2 (Manivannan)
- Rebased on top of v7.4-rc1
- Link to v16: https://patch.msgid.link/20261014-sa8255p-eth-phy-v16-0-6310fac52e85@oss.qualcomm.com

Changes in v16:
- Split out the PHY patches into a separate series
- Set the SerDes line rate through the OPP API
- Link to v15: https://patch.msgid.link/20260923-qcom-sa8255p-emac-v15-0-e82f33720737@oss.qualcomm.com

Changes in v15:
- Squash patches 6 and 7 to avoid a potential hang-on-resume regression
  (Sashiko)
- Fix the AUTONEG_DISABLE early return path in forced mode (Sashiko)
- Fix Kconfig dependencies on generic power domains (Sashiko)
- Set the performance level back to 0 on unbind in the PHY driver
  (Sashiko)
- Use devm_pm_runtime_enable() where applicable
- Link to v14: https://patch.msgid.link/20260908-qcom-sa8255p-emac-v14-0-ec212b747a7d@oss.qualcomm.com

Changes in v14:
- let genpd's own runtime suspend/resume callbacks own the perf state entirely
  by calling dev_pm_genpd_set_performance_state() in set_mode()
  unconditionally in the sgmii PHY driver
- drop usleep_range() from the PHY driver when setting the state as the level
  setting is already synchronous
- add missing power-domains limits for ma35d1/k3-dwmac
- fix ordering of clearing the sgmii loopback
- configure the wrapper clocks synchronously in scmi setup
- Link to v13: https://patch.msgid.link/20260713-qcom-sa8255p-emac-v13-0-119f8699ef8e@oss.qualcomm.com

Changes in v13:
- Reapply OPP on speed change in the PHY driver
- Use linux/device-id/of.h instead of mod_devicetable.h
- Fix the "invalid PTP clock rate" warning on sa8255p
- Add commits necessary to allow correct link speed change with SCMI
- Link to v12: https://patch.msgid.link/20260706-qcom-sa8255p-emac-v12-0-e3ab1ecf2901@oss.qualcomm.com

Changes in v12:
- Drop the power-domain-names from the SGMII PHY DT bindings
- Add missing Kconfig dependency on PM for the new SGMII PHY driver
- Link to v11: https://patch.msgid.link/20260629-qcom-sa8255p-emac-v11-0-1b7fb95b51f9@oss.qualcomm.com

Changes in v11:
- Take a new approach: add a dedicated driver for the firmware-managed
  SGMII PHY and simplify changes made to the MAC driver
- Link to v10: https://patch.msgid.link/20260323-qcom-sa8255p-emac-v10-0-79302b238a16@oss.qualcomm.com

Changes in v10:
- Fix unit address in DT example
- Link to v9: https://patch.msgid.link/20260316-qcom-sa8255p-emac-v9-0-c58934e76ff2@oss.qualcomm.com

Changes in v9:
- Rebase on top of current linux-next again
- Link to v8: https://patch.msgid.link/20260311-qcom-sa8255p-emac-v8-0-58227bcf1018@oss.qualcomm.com

Changes in v8:
- Rebase on top of recent changes in linux-next which required an
  extensive rework
- Drop partial R-b tags
- Link to v7: https://patch.msgid.link/20260306-qcom-sa8255p-emac-v7-0-d6a3013094b7@oss.qualcomm.com

Changes in v7:
- Restored the correct authorship after learning git uses .mailmap for
  the --author switch
- Rebased on top of changes from Russell
- Fixed resource management issues in error paths
- Link to v6: https://lore.kernel.org/r/20260112-qcom-sa8255p-emac-v6-0-86a3d4b2ad83@oss.qualcomm.com

Changes in v6:
- Fix $id value in the bindings
- Drop patch 3/8 from the series
- Update init/exit callback signatures
- Link to v5: https://lore.kernel.org/r/20251107-qcom-sa8255p-emac-v5-0-01d3e3aaf388@linaro.org
- Link to v6: https://lore.kernel.org/r/20251219-qcom-sa8255p-emac-v6-0-487f1082461e@oss.qualcomm.com

Changes in v5:
- Name the DT binding document after the new compatbile
- Add missing space
- Make the power-domains limits stricter
- Link to v4: https://lore.kernel.org/r/20251104-qcom-sa8255p-emac-v4-0-f76660087cea@linaro.org

Changes in v4:
- Remove the phys property from the SCMI bindings
- Mark the power-domain-names property as required
- Set maxItems for power-domains to 1 for all existing bindings to
  maintain the current requirements after modifying the value in the
  top-level document
- Link to v3: https://lore.kernel.org/r/20251027-qcom-sa8255p-emac-v3-0-75767b9230ab@linaro.org

Changes in v3:
- Drop 'power' and 'perf' prefixes from power domain names
- Rebase on top of Russell's changes to dwmac
- Rebase on top of even more changes from Russell that are not yet
  in next (E1vB6ld-0000000BIPy-2Qi4 at rmk-PC.armlinux.org.uk)
- Link to v2: https://lore.kernel.org/all/20251008-qcom-sa8255p-emac-v2-0-92bc29309fce@linaro.org/

Changes in v2:
- Fix the power-domains property in DT bindings
- Rework the DT bindings example
- Drop the DTS patch, it will go upstream separately
- Link to v1: https://lore.kernel.org/r/20250910-qcom-sa8255p-emac-v1-0-32a79cf1e668@linaro.org

---
Bartosz Golaszewski (2):
      dt-bindings: phy: document the serdes PHY on sa8255p
      phy: qcom: add the SGMII SerDes PHY driver for SCMI systems

 .../bindings/phy/qcom,sa8255p-dwmac-sgmii-phy.yaml |  45 ++++++++
 drivers/phy/qualcomm/Kconfig                       |  11 ++
 drivers/phy/qualcomm/Makefile                      |   1 +
 drivers/phy/qualcomm/phy-qcom-sgmii-eth-scmi.c     | 113 +++++++++++++++++++++
 4 files changed, 170 insertions(+)
---
base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
change-id: 20261002-sa8255p-eth-phy-6a0699f98a7a

Best regards,
--  
Bartosz Golaszewski <bartosz.golaszewski at oss.qualcomm.com>