[PATCH net-next v4 0/6] net: stmmac: add Allwinner H616 EMAC1 support

[James Hilliard]

The H616 secondary EMAC supports RMII at 10/100 Mbps and uses a separate
system-control clock register at offset 0x34. Add its binding and a
sun8i stmmac variant using that register. A distinct compatible without
an older fallback prevents the driver from using EMAC0's clock register.

EMAC1 connects internally to the co-packaged AC200 or AC300 EPHY and has
no external PHY pins. Leave PHY initialization to the PHY driver instead
of using the H3 internal-PHY controls. The RMII-only variant does not
expose the RGMII clock-delay properties.

First fix failed MTU-change reopening and hardware-resume cleanup in the
stmmac core so the interface is closed without repeating NAPI shutdown
or resource teardown. Allow phylink to stop a suspended instance without
restarting its link. Then move the MAC software reset from probe to the
DMA reset callback, after PHY initialization. This lets the MAC and its
MDIO bus remain registered when the PHY driver or one of its suppliers
is not ready yet. Clear DMA and interrupt state even if the reset times
out. Keep the separate H3 MDIO-mux reset sequence unchanged.

The AC200/AC300 EPHY driver and package bindings are already in
net-next. This series separates the H616 EMAC1 MAC driver and binding
support from the earlier combined series. PWM, MFD and device-tree
enablement are being handled separately.

Signed-off-by: James Hilliard <james.hilliard1 at gmail.com>
---
Changes in v4:
- Add a prerequisite stmmac core fix closing the interface after a failed
  MTU-change reopen without repeating DMA, IRQ or NAPI teardown.
- Close the interface after failed hardware resume, and let phylink
  finish shutdown directly from its suspended state.
- Retain DMA and interrupt-register clearing when the sun8i MAC reset
  times out, and return the original reset error.
- Link to v3: https://patch.msgid.link/20260917-submit-h616-emac1-v1-v3-0-62cb8316e19b@gmail.com

Changes in v3:
- Add a prerequisite fix moving the MAC software reset to the DMA reset
  callback, after PHY initialization, so delayed module loading and
  deferred PHY probes do not tear down the MAC and its MDIO bus.
- Preserve the H3 MDIO-mux reset and propagate hardware-reset failures
  through the normal stmmac hardware-setup error path.
- Add Alastair D'Silva to Cc and rebase onto current net-next.
- Link to v2: https://patch.msgid.link/20260915-submit-h616-emac1-v1-v2-0-322b32e40eb9@gmail.com

Changes in v2:
- Drop EMAC1 TX/RX clock-delay property support and keep the existing
  RGMII-only delay descriptions unchanged, as requested by Maxime Ripard.
- Clarify that EMAC1 connects internally to a co-packaged PHY, not an
  external PHY or the H3-style internal-PHY controls.
- Rebase onto current net-next.
- Link to v1: https://patch.msgid.link/20260915-submit-h616-emac1-v1-v1-0-195de0bb1f8a@gmail.com

To: Maxime Chevallier <maxime.chevallier at bootlin.com>
To: Andrew Lunn <andrew+netdev at lunn.ch>
To: "David S. Miller" <davem at davemloft.net>
To: Eric Dumazet <edumazet at google.com>
To: Jakub Kicinski <kuba at kernel.org>
To: Paolo Abeni <pabeni at redhat.com>
To: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
To: Alexandre Torgue <alexandre.torgue at foss.st.com>
To: Russell King <linux at armlinux.org.uk>
To: Christian Marangi <ansuelsmth at gmail.com>
To: Chen-Yu Tsai <wens at kernel.org>
To: Jernej Skrabec <jernej.skrabec at gmail.com>
To: Samuel Holland <samuel at sholland.org>
To: Rob Herring <robh at kernel.org>
To: Krzysztof Kozlowski <krzk+dt at kernel.org>
To: Conor Dooley <conor+dt at kernel.org>
To: Maxime Ripard <mripard at kernel.org>
To: Giuseppe Cavallaro <peppe.cavallaro at st.com>
To: Jose Abreu <joabreu at synopsys.com>
To: Andrew Lunn <andrew at lunn.ch>
To: Heiner Kallweit <hkallweit1 at gmail.com>
To: Tiezhu Yang <yangtiezhu at loongson.cn>
To: Huacai Chen <chenhuacai at kernel.org>
Cc: netdev at vger.kernel.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-sunxi at lists.linux.dev
Cc: devicetree at vger.kernel.org

---
James Hilliard (6):
      net: phylink: allow stopping a suspended instance
      net: stmmac: close the interface after a failed MTU reopen
      net: stmmac: close the interface after failed hardware resume
      net: stmmac: sun8i: reset the MAC after PHY initialization
      dt-bindings: net: allwinner: add H616 EMAC1
      net: stmmac: sun8i: add support for Allwinner H616 EMAC1

 .../bindings/net/allwinner,sun8i-a83t-emac.yaml    | 13 ++++
 .../devicetree/bindings/net/snps,dwmac.yaml        |  2 +
 drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c  | 69 +++++++++++++---------
 drivers/net/ethernet/stmicro/stmmac/stmmac.h       |  2 +
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 30 +++++++---
 drivers/net/phy/phylink.c                          | 16 +++++
 6 files changed, 98 insertions(+), 34 deletions(-)
---
base-commit: 8830e65ed46de41f849eefb8ba227d4852c460f6
change-id: 20260914-submit-h616-emac1-v1-143703842abb

Best regards,
--  
James Hilliard <james.hilliard1 at gmail.com>