[PATCH 0/6] Additional regulator support for the Qualcomm SGMII SerDes PHY

[Loic Poulain]

Hi,

On Mon, Nov 24, 2025 at 10:26 AM Mohd Ayaan Anwar
<mohd.anwar at oss.qualcomm.com> wrote:
>
> This patch series addresses a SerDes power-up failure observed on the
> QCS8300 Ride board using the phy-qcom-sgmii-eth driver. The issue occurs
> because the SerDes PHY requires both L5A and L4A regulators to be
> enabled during initialization. If either one of them is disabled, the
> status register does not reset, and the Ethernet interface fails to come
> up due to a timeout:
>
> [   77.105651] qcom-dwmac-sgmii-phy 8909000.phy: QSERDES_COM_C_READY_STATUS timed-out
> [   77.113447] qcom-ethqos 23040000.ethernet eth0: __stmmac_open: Serdes powerup failed
>
> Presumably, the issue is not seen on all users of this PHY because both
> regulators are often shared with other peripherals. However, the power
> rail schematics for boards using this SerDes PHY show that it is
> supplied by both L5A (1.2V) and L4A (0.9V) regulators.
>
> This series has been tested on the QCS8300 Ride board, and the reported
> issue was resolved. All Monaco and Lemans derivative boards require this
> new configuration as they use the same SerDes PHY.
>
> Signed-off-by: Mohd Ayaan Anwar <mohd.anwar at oss.qualcomm.com>

This appears to be a real issue, but I haven’t seen a new version of
the series or any response to the feedback so far. Could you please
follow up on this?

> ---
> Mohd Ayaan Anwar (6):
>       dt-bindings: phy: describe additional regulator for Qualcomm SGMII PHY
>       arm64: dts: qcom: lemans-evk: add additional SerDes PHY regulator
>       arm64: dts: qcom: lemans-ride-common: add additional SerDes PHY regulators
>       arm64: dts: qcom: monaco-evk: fix the SerDes PHY regulators
>       arm64: dts: qcom: qcs8300-ride: add additional SerDes PHY regulator
>       phy: qcom: sgmii-eth: add second regulator support
>
>  .../bindings/phy/qcom,sa8775p-dwmac-sgmii-phy.yaml |  4 ++++
>  arch/arm64/boot/dts/qcom/lemans-evk.dts            |  1 +
>  arch/arm64/boot/dts/qcom/lemans-ride-common.dtsi   |  4 ++++
>  arch/arm64/boot/dts/qcom/monaco-evk.dts            |  3 ++-
>  arch/arm64/boot/dts/qcom/qcs8300-ride.dts          |  2 ++
>  drivers/phy/qualcomm/phy-qcom-sgmii-eth.c          | 24 +++++++++++++++++++++-
>  6 files changed, 36 insertions(+), 2 deletions(-)
> ---
> base-commit: 0f2995693867bfb26197b117cd55624ddc57582f
> change-id: 20251124-sgmiieth_serdes_regulator-027fc6b15216
>
> Best regards,
> --
> Mohd Ayaan Anwar <mohd.anwar at oss.qualcomm.com>
>
>