[PATCH RFC 0/2] riscv: dts: spacemit: Enable PowerVR GPU on OrangePi RV2

[Iker Pedrosa <ikerpedrosam@gmail.com>]

Enable the Imagination PowerVR Rogue GPU (BXE-2-32) on the SpacemiT K1
SoC for the OrangePi RV2 board.

This series depends on:
- Yixun Lan's power domain series [1], which provides the genpd-based
  GPU power domain driver required for proper power sequencing.
- Baihui Liang's dt-bindings patch [2], which adds the spacemit,k1-gpu
  compatible string to the img,powervr-rogue binding.

The GPU firmware is not yet available upstream. A copy can be found
at [3].

With this series applied on top of [1] and [2], the full GPU bring-up
path works end-to-end on hardware:
- Power domain: GPU power island on/off via APMU
- Clock: GPU clock enabled/gated through CCU
- Reset: GPU reset line deasserted
- Firmware: PowerVR RISC-V firmware loads and signals ready
- DMA: dma-ranges correctly maps CPU-to-GPU physical addresses
- DRM: kernel exposes /dev/dri/card0 and /dev/dri/renderD128
- IRQ: GPU interrupt registered, firmware watchdog running

Userspace rendering requires Mesa's PowerVR Vulkan driver
(imagination-experimental).

[1] https://lore.kernel.org/linux-riscv/20261008-04-k3-pm-support-v2-0-6f778a53dd2d@kernel.org/
[2] https://lore.kernel.org/linux-riscv/20261015-spacemit-gpu-binding-v1-1-a7a23c7e7788@linux.spacemit.com/
[2] https://gitlab.freedesktop.org/imagination/linux-firmware/-/blob/powervr/powervr/rogue_36.29.52.182_v1.fw

Signed-off-by: Iker Pedrosa <ikerpedrosam@gmail.com>
---
Iker Pedrosa (2):
      riscv: dts: spacemit: k1: add PowerVR GPU device node
      riscv: dts: spacemit: k1-orangepi-rv2: enable GPU

 arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts |  4 ++++
 arch/riscv/boot/dts/spacemit/k1.dtsi             | 12 ++++++++++++
 2 files changed, 16 insertions(+)
---
base-commit: 7e986b457d43edf8dd3eb3f6c34e55e92cd545f3
change-id: 20260413-orangepi-gpu-02d839d6506f

Best regards,
-- 
Iker Pedrosa <ikerpedrosam@gmail.com>