[v6] riscv: Use GCR.U timer device as clocksource

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

Aleksa Paunovic via B4 Relay posted 2 patches 1 week ago

Diff against v5 v6
Download series mbox

.../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(-)

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

Posted by Aleksa Paunovic via B4 Relay 1 week ago

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@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@htecgroup.com>