This adds initial support for the Banana Pi BPI-CM6 IO board. The
BPI-CM6 is an industrial-grade RISC-V compute module powered by the
SpacemiT K1 SoC, featuring board-to-board connectors similar to the
Raspberry Pi CM4 form factor. For evaluation and development, the module
is paired with a companion IO carrier board.

During the board bring-up, GPIO45 and GPIO46 were found to be used by
the BPI-CM6 hardware as Ethernet PHY reset GPIOs, while the common K1
GMAC pinctrl groups currently mux them as optional GMAC reference clock
pins. Since the reference clock pins are not required on all K1 boards,
the first patch separates them into independent pinctrl groups so board
DTS files can select them only when the signal is actually wired.

This is based on the "dt-for-next" branch of the spacemit-com/linux.

Link: https://docs.banana-pi.org/en/BPI-CM6/BananaPi_BPI-CM6
Signed-off-by: Junhui Liu <junhui.liu@pigmoral.tech>
---
Junhui Liu (3):
      dt-bindings: riscv: spacemit: Add Banana Pi BPI-CM6 compatible
      riscv: dts: spacemit: k1: Split gmac_clk_ref into independent pinctrl groups
      riscv: dts: spacemit: k1: Add Banana Pi BPI-CM6 IO board

 .../devicetree/bindings/riscv/spacemit.yaml        |   5 +
 arch/riscv/boot/dts/spacemit/Makefile              |   1 +
 .../riscv/boot/dts/spacemit/k1-bananapi-cm6-io.dts | 215 +++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k1-bananapi-cm6.dtsi  | 227 +++++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi       |  24 ++-
 5 files changed, 468 insertions(+), 4 deletions(-)
---
base-commit: 6edd9a0d32e1ef81133b8cb5b3bb3157a44da4d1
change-id: 20260522-bpi-cm6-dc38f91e3fec

Best regards,
-- 
Junhui Liu <junhui.liu@pigmoral.tech>