[PATCH net-next v2 0/5] net: stmmac: Add common RGMII delay handling and DP1000 support

The UltraRISC DP1000 integrates a Synopsys DesignWare GMAC from the 5.20
series with fixed internal delays on both TX and RX RGMII clock paths.

For boards without PCB delays, "rgmii-id" describes the link. Passing this
mode unchanged to the PHY would enable another pair of delays and break
RGMII timing.

Add TX and RX internal-delay capability flags to the common stmmac platform
data and adjust the PHY interface mode in stmmac_pltfr_probe(). Convert the
Sophgo and EIC7700 glue drivers to this common handling, then add the DP1000
binding and glue driver. The DP1000 glue driver only declares both delay
capabilities.

Tested with:

1. dt_binding_check and dtbs_check.
2. RISC-V build with CONFIG_DWMAC_ULTRARISC=m.
3. Runtime validation on Shenzhen Rongda M0 with a YT8531S PHY and
   Milk-V Titan with an RTL8211F PHY: ultrarisc-dwmac binds and
   establishes a 1000 Mb/s full-duplex link on both boards.

Signed-off-by: Jia Wang <wangjia@ultrarisc.com>
---
Changes in v2:
- Fold the snps,dwmac compatible-list update into the DP1000 binding patch.
- Add common stmmac capability flags for MAC-provided RGMII delays.
- Convert Sophgo and EIC7700 to the common RGMII delay handling.
- Simplify the DP1000 glue driver to declare its TX and RX delay
  capabilities.
- Add Conor Dooley's Reviewed-by tag to the DP1000 binding patch.
- Link to v1: https://patch.msgid.link/20260901-dwmac-ultrarisc-v1-0-f19454814bcf@ultrarisc.com

To: Andrew Lunn <andrew+netdev@lunn.ch>
To: "David S. Miller" <davem@davemloft.net>
To: Eric Dumazet <edumazet@google.com>
To: Jakub Kicinski <kuba@kernel.org>
To: Paolo Abeni <pabeni@redhat.com>
To: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzk+dt@kernel.org>
To: Conor Dooley <conor+dt@kernel.org>
To: Jia Wang <wangjia@ultrarisc.com>
To: Alexandre Torgue <alexandre.torgue@foss.st.com>
To: Giuseppe Cavallaro <redacted>
To: Jose Abreu <redacted>
To: Maxime Chevallier <maxime.chevallier@bootlin.com>
To: Maxime Coquelin <mcoquelin.stm32@gmail.com>
To: Chen Wang <chen.wang@linux.dev>
To: Inochi Amaoto <inochiama@gmail.com>
Cc: netdev@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: sophgo@lists.linux.dev

---
Jia Wang (5):
      net: stmmac: Add common internal RGMII delay handling
      net: stmmac: sophgo: Use common RGMII delay handling
      net: stmmac: eic7700: Use common RGMII delay handling
      dt-bindings: net: Add UltraRISC DP1000 GMAC
      net: stmmac: Add UltraRISC DP1000 GMAC support

 .../devicetree/bindings/net/snps,dwmac.yaml        |  1 +
 .../bindings/net/ultrarisc,dp1000-gmac.yaml        | 74 ++++++++++++++++++++++
 MAINTAINERS                                        |  6 ++
 drivers/net/ethernet/stmicro/stmmac/Kconfig        | 11 ++++
 drivers/net/ethernet/stmicro/stmmac/Makefile       |  1 +
 .../net/ethernet/stmicro/stmmac/dwmac-eic7700.c    | 13 +---
 drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c | 12 ++--
 .../net/ethernet/stmicro/stmmac/dwmac-ultrarisc.c  | 52 +++++++++++++++
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  | 11 ++++
 include/linux/stmmac.h                             |  2 +
 10 files changed, 164 insertions(+), 19 deletions(-)
---
base-commit: df2908090cda368b01ff43709f51890076c56157
change-id: 20260827-dwmac-ultrarisc-7c79f2f80fd1

Best regards,
--  
Jia Wang [off-list ref]