Re: [PATCH net-next v3 0/3] net: stmmac: add Allwinner H616 EMAC1 support

[Alastair D'Silva <alastair@d-silva.org>]

On Thu, 2026-09-17 at 11:55 -0600, James Hilliard wrote:
> 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 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.
> 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@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
> 
> ---
> James Hilliard (3):
>       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  | 66
> +++++++++++++---------
>  3 files changed, 55 insertions(+), 26 deletions(-)
> ---
> base-commit: 26ee8cd69d46a14b37ba5e512084fe80d730127a
> change-id: 20260914-submit-h616-emac1-v1-143703842abb
> 
> Best regards,
> --  
> James Hilliard <james.hilliard1@gmail.com>
> 

Tested-by: Alastair D'Silva <alastair@d-silva.org>
Reviewed-by: Alastair D'Silva <alastair@d-silva.org>

As a follow-up (non blocking), I would add the LED control registers I
mentioned at the bottom of my test results. 

-- 
Alastair D'Silva