linux-kernel - [PATCH net-next v2 0/6] Add Ethernet MAC support for SpacemiT K1

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Message-Id: <20250618-net-k1-emac-v2-0-94f5f07227a8@iscas.ac.cn>
Date: Wed, 18 Jun 2025 11:40:45 +0800
From: Vivian Wang <wangruikang@...as.ac.cn>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Vivian Wang <wangruikang@...as.ac.cn>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: Vivian Wang <uwu@...m.page>, Lukas Bulwahn <lukas.bulwahn@...hat.com>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>, 
 netdev@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, spacemit@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>
Subject: [PATCH net-next v2 0/6] Add Ethernet MAC support for SpacemiT K1

SpacemiT K1 has two gigabit Ethernet MACs with RGMII and RMII support.
Add a driver for them, as well as the supporting devicetree and bindings
updates.

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]. This series depends on reset controller
support for K1 [2]. These patches can also be pulled from:

https://github.com/dramforever/linux/tree/k1/ethernet/v2

Note on patch 3: I am still fairly certain that such a bus with empty
ranges is allowed under both the spirit and the letter of simple-bus
bindings [3].  This also passes "make dtbs_check" with only unrelated
warnings that was already there.

[1]: https://github.com/spacemit-com/linux-k1x
[2]: https://lore.kernel.org/all/20250613011139.1201702-1-elder@riscstar.com
[3]: https://github.com/devicetree-org/dt-schema/commit/ed9190d20f146d13e262cc9138506326f7d4da91

---
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

---
Vivian Wang (6):
      dt-bindings: net: Add support for SpacemiT K1
      net: spacemit: Add K1 Ethernet MAC
      riscv: dts: Add network-bus dma-ranges for SpacemiT K1
      riscv: dts: spacemit: Add Ethernet support for K1
      riscv: dts: spacemit: Add Ethernet support for BPI-F3
      riscv: dts: spacemit: Add Ethernet support for Jupiter

 .../devicetree/bindings/net/spacemit,k1-emac.yaml  |   81 +
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts    |   46 +
 arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts  |   46 +
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi       |   48 +
 arch/riscv/boot/dts/spacemit/k1.dtsi               |   31 +
 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            | 1934 ++++++++++++++++++++
 drivers/net/ethernet/spacemit/k1_emac.h            |  416 +++++
 11 files changed, 2639 insertions(+)
---
base-commit: d9946fe286439c2aeaa7953b8c316efe5b83d515
change-id: 20250606-net-k1-emac-3e181508ea64
prerequisite-message-id: <20250613011139.1201702-1-elder@...cstar.com>
prerequisite-patch-id: 2c73c63bef3640e63243ddcf3c07b108d45f6816
prerequisite-patch-id: 0faba75db33c96a588e722c4f2b3862c4cbdaeae
prerequisite-patch-id: 5db8688ef86188ec091145fae9e14b2211cd2b8c
prerequisite-patch-id: e0fe84381637dc888d996a79ea717ff0e3441bd1
prerequisite-patch-id: 2fc0ef1c2fcda92ad83400da5aadaf194fe78627
prerequisite-patch-id: bfa54447803e5642059c386e2bd96297e691d0bf

Best regards,
-- 
Vivian "dramforever" Wang