[PATCH net-next v4 0/2] Add Ethernet MAC support for SpacemiT K1

SpacemiT K1 has two gigabit Ethernet MACs with RGMII and RMII support.
Add devicetree bindings and driver for it. DTS changes will be submitted
separately.

Tested on BananaPi BPI-F3 and Milk-V Jupiter.

I would like to note that even though some bit field names superficially
resemble that of DesignWare MAC, all other differences point to it in
fact being a custom design.

Based on SpacemiT drivers [1].

For convenience of testing, these patches and related DTS changes are
also available at:

https://github.com/dramforever/linux/tree/k1/ethernet/v4

[1]: https://github.com/spacemit-com/linux-k1x

---
Changes in v4:
- Resource handling on probe and remove: timer_delete_sync and
  of_phy_deregister_fixed_link
- Drop DTS changes and dependencies (will send through SpacemiT tree)
- Minor changes:
  - Remove redundant phy_stop() and setting of ndev->phydev
  - Fix error checking for emac_open in emac_resume
  - Fix one missed dev_err -> dev_err_probe
  - Fix type of emac_start_xmit
  - Fix one missed reverse xmas tree formatting
  - Rename some functions for consistency between emac_* and ndo_*
- Link to v3: https://lore.kernel.org/r/20250702-net-k1-emac-v3-0-882dc55404f3@iscas.ac.cn (local)

Changes in v3:
- Refactored and simplified emac_tx_mem_map
- Addressed other minor v2 review comments
- Removed what was patch 3 in v2, depend on DMA buses instead
- DT nodes in alphabetical order where appropriate
- Link to v2: https://lore.kernel.org/r/20250618-net-k1-emac-v2-0-94f5f07227a8@iscas.ac.cn (local)

Changes in v2:
- dts: Put eth0 and eth1 nodes under a bus with dma-ranges
- dts: Added Milk-V Jupiter
- Fix typo in emac_init_hw() that broke the driver (Oops!)
- Reformatted line lengths to under 80
- Addressed other v1 review comments
- Link to v1: https://lore.kernel.org/r/20250613-net-k1-emac-v1-0-cc6f9e510667@iscas.ac.cn (local)

---
Vivian Wang (2):
      dt-bindings: net: Add support for SpacemiT K1
      net: spacemit: Add K1 Ethernet MAC

 .../devicetree/bindings/net/spacemit,k1-emac.yaml  |   81 +
 drivers/net/ethernet/Kconfig                       |    1 +
 drivers/net/ethernet/Makefile                      |    1 +
 drivers/net/ethernet/spacemit/Kconfig              |   29 +
 drivers/net/ethernet/spacemit/Makefile             |    6 +
 drivers/net/ethernet/spacemit/k1_emac.c            | 1891 ++++++++++++++++++++
 drivers/net/ethernet/spacemit/k1_emac.h            |  420 +++++
 7 files changed, 2429 insertions(+)
---
base-commit: d9946fe286439c2aeaa7953b8c316efe5b83d515
change-id: 20250606-net-k1-emac-3e181508ea64

Best regards,
-- 
Vivian "dramforever" Wang