[PATCH RESEND v6 0/2] riscv: Use GCR.U timer device as clocksource

[Aleksa Paunovic via B4 Relay]

This series adds bindings for the GCR.U timer device and corresponding
driver support. Accessing the memory mapped mtime register in the GCR.U
region should be faster than trapping to M mode each time the timer
needs to be read.

Signed-off-by: Aleksa Paunovic <aleksa.paunovic at htecgroup.com>
---
Changes in v6:
- Rename mti,gcru to mips,p8700-gcru
- Link to v5: https://lore.kernel.org/r/20250711-riscv-time-mmio-v5-0-9ed1f825ad5e@htecgroup.com

Changes in v5:
- Fixed build issues on 32-bit RISC-V and sparse warnings
- Remove clint_time_val and clint.h, replace with riscv_time_val
- Depend on RISCV_TIMER in Kconfig
Changes in v4:
- Remove "select" from mti,gcru.yaml.
- Refactor the driver to use function pointers instead of static keys.

Previous versions:
v1: https://lore.kernel.org/lkml/20241227150056.191794-1-arikalo@gmail.com/#t
v2: https://lore.kernel.org/linux-riscv/20250409143816.15802-1-aleksa.paunovic@htecgroup.com/
v3: https://lore.kernel.org/linux-riscv/DU0PR09MB61968695A2A3146EE83B7708F6BA2@DU0PR09MB6196.eurprd09.prod.outlook.com/
v4: https://lore.kernel.org/r/20250514-riscv-time-mmio-v4-0-cb0cf2922d66@htecgroup.com
v5: https://lore.kernel.org/r/20250711-riscv-time-mmio-v5-0-9ed1f825ad5e@htecgroup.com

---
Aleksa Paunovic (2):
      dt-bindings: timer: mips,p8700-gcru
      riscv: Allow for riscv-clock to pick up mmio address.

 .../devicetree/bindings/timer/mips,p8700-gcru.yaml | 38 +++++++++++++
 arch/riscv/include/asm/clint.h                     | 26 ---------
 arch/riscv/include/asm/timex.h                     | 63 ++++++++++++----------
 drivers/clocksource/Kconfig                        | 12 +++++
 drivers/clocksource/timer-clint.c                  | 20 ++++---
 drivers/clocksource/timer-riscv.c                  | 34 ++++++++++++
 6 files changed, 128 insertions(+), 65 deletions(-)
---
base-commit: 038d61fd642278bab63ee8ef722c50d10ab01e8f
change-id: 20250424-riscv-time-mmio-5628e0fca8af

Best regards,
-- 
Aleksa Paunovic <aleksa.paunovic at htecgroup.com>