[PATCH v2 0/2] cpufreq: spacemit: Add cpufreq support for K1 SoC

[Shuwei Wu <shuwei.wu@mailbox.org>]

This series enables dynamic voltage and frequency scaling (DVFS) for
the SpacemiT K1 SoC using the generic cpufreq-dt driver.

Tested on Banana Pi BPI-F3, the execution time scales as expected
across different CPU frequencies:

~ # echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

~ # echo 1600000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
~ # time awk 'BEGIN{for(i=0;i<1000000;i++){}}'
real    0m 1.07s
user    0m 1.07s
sys     0m 0.00s

~ # echo 1228800 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
~ # time awk 'BEGIN{for(i=0;i<1000000;i++){}}'
real    0m 1.40s
user    0m 1.40s
sys     0m 0.00s

~ # echo 1000000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
~ # time awk 'BEGIN{for(i=0;i<1000000;i++){}}'
real    0m 1.72s
user    0m 1.72s
sys     0m 0.00s

~ # echo 819000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
~ # time awk 'BEGIN{for(i=0;i<1000000;i++){}}'
real    0m 2.10s
user    0m 2.10s
sys     0m 0.00s

~ # echo 614400 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
~ # time awk 'BEGIN{for(i=0;i<1000000;i++){}}'
real    0m 2.80s
user    0m 2.80s
sys     0m 0.00s

Signed-off-by: Shuwei Wu <shuwei.wu@mailbox.org>
---
Changes in v2:
- Move OPP tables to dedicated k1-opp.dtsi
- Enable OPP only on BPI-F3 with cpu-supply present
- Link to v1: https://lore.kernel.org/r/20260308-shadow-deps-v1-0-0ceb5c7c07eb@mailbox.org

---
Shuwei Wu (2):
      cpufreq: dt-platdev: Add SpacemiT K1 SoC to the allowlist
      riscv: dts: spacemit: Add cpu scaling for K1 SoC

 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts |  35 +++++++-
 arch/riscv/boot/dts/spacemit/k1-opp.dtsi        | 105 ++++++++++++++++++++++++
 arch/riscv/boot/dts/spacemit/k1.dtsi            |   8 ++
 drivers/cpufreq/cpufreq-dt-platdev.c            |   1 +
 4 files changed, 148 insertions(+), 1 deletion(-)
---
base-commit: 5164e95565d3fd508ca8a95351323f5716dfb695
change-id: 20260307-shadow-deps-3582a78aa756
prerequisite-patch-id: 154bd4f720ce5065d58b988de8f273207b44572e
prerequisite-message-id: <20260206-spacemit-p1-v4-0-8f695d93811e@riscstar.com>
prerequisite-patch-id: 5da3e75b18291a5540d4f66d7a0600fb8975ef62
prerequisite-patch-id: bcf41917414ecef8cf743095d130f6004c32f6a5
prerequisite-patch-id: cfe3800f8c791ec4c63e070af9628e88e0fc31b9
prerequisite-message-id: <20260305-k1-clk-fix-v1-1-abca85d6e266@mailbox.org>
prerequisite-patch-id: 7c7fb9f87dba019ece4c97c45750349a7cd28f3a

Best regards,
-- 
Shuwei Wu <shuwei.wu@mailbox.org>