[PATCH RFC 0/9] net: stmmac: qcom-ethqos: add Shikra EMAC support

[Mohd Ayaan Anwar]

(Sending this out as an RFC because we have a couple of fixes for RGMII
handling in dwmac-qcom-ethqos, as well as a new framework to manage
clocks required by the System NOC. If this gets into a decent shape,
then this series will be split between patches for DT and net-next.)

Hi,

This series adds Gigabit Ethernet support for the Qualcomm Shikra SoC,
which integrates two EMAC controllers based on the Synopsys GMAC IP,
similar to previous Qualcomm platforms.

Before introducing the new compatible, two generic fixes are applied to
the driver that benefit all platforms:

  - ethqos_rgmii_macro_init() is converted to void; the return value was
    never checked and the speed validation was redundant.

  - RGMII_ID mode ("rgmii-id") was incorrectly falling through to the
    standard DLL bring-up path, which may add MAC-internal delays. The
    fix powers down the DLL, sets DDR bypass mode, and programs the
    IO_MACRO via a new ethqos_rgmii_id_macro_init() helper. The clock
    rate doubling in ethqos_set_clk_tx_rate() is also corrected for
    bypass mode.

Shikra-specific additions:

  - On Shikra, access to the System NOC from the EMAC is gated by three
    dedicated clocks. The axi and axi-noc clocks are sourced from a
    dedicated RCG (emac0_axi_clk_srcg) per EMAC instance. The
    pcie-tile-axi-noc clock (gcc_pcie_tile_axi_sys_noc_clk) gates an
    arbiter internal to the NOC shared by both EMAC instances and must
    be enabled for any EMAC-to-DDR traffic to complete. Generic
    infrastructure is introduced (ethqos_noc_clk_cfg) so future
    platforms can declare their own sets.

  - The qcom,shikra-ethqos compatible is registered.

  - DTS for the SoC and three EVK boards (CQM, CQS, IQS) is included.
    The CQM and CQS boards expose one EMAC; the IQS board exposes both.

Dependencies:
  This series is based on linux-next and depends on the core Shikra SoC
  framework (DT, clock, regulator) being merged.

Tested on the Shikra CQM-EVK, CQS-EVK, and IQS-EVK with rgmii-id mode
at 1G/100M/10M speeds.

---
Mohd Ayaan Anwar (9):
      dt-bindings: net: qcom,ethqos: add qcom,shikra-ethqos compatible
      net: stmmac: qcom-ethqos: convert ethqos_rgmii_macro_init() to void
      net: stmmac: qcom-ethqos: fix RGMII_ID mode to use DLL bypass
      net: stmmac: qcom-ethqos: add per-platform NOC clock voting
      net: stmmac: qcom-ethqos: add Shikra EMAC support
      arm64: dts: qcom: shikra: Add ethernet nodes
      arm64: dts: qcom: shikra-cqm-evk: Enable ethernet0
      arm64: dts: qcom: shikra-cqs-evk: Enable ethernet0
      arm64: dts: qcom: shikra-iqs-evk: Enable both ethernet ports

 .../devicetree/bindings/net/qcom,ethqos.yaml       |  31 ++-
 arch/arm64/boot/dts/qcom/shikra-cqm-evk.dts        | 119 +++++++++++
 arch/arm64/boot/dts/qcom/shikra-cqs-evk.dts        | 119 +++++++++++
 arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts        | 235 +++++++++++++++++++++
 arch/arm64/boot/dts/qcom/shikra.dtsi               |  78 +++++++
 .../ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c    | 167 ++++++++++++++-
 6 files changed, 730 insertions(+), 19 deletions(-)
---
base-commit: 999ed3289ceea2b2808f396b4bd2f9a43dcba033
change-id: 20260611-shikra_ethernet-11a1b318d5b6

Best regards,
-- 
Mohd Ayaan Anwar <mohd.anwar at oss.qualcomm.com>