[PATCH 0/5] RISC-V: RPMI performance service bindings and cpufreq support

[Rahul Pathak]

On Tue, Jan 6, 2026 at 2:51 PM Joshua Yeong
<joshua.yeong at starfivetech.com> wrote:
>
> This patch series introduces support for the RISC-V RPMI (RISC-V Platform
> Management Interface) performance service, covering both Device Tree bindings
> and a corresponding cpufreq driver.
>
> The first part of the series adds YAML bindings to describe the RPMI performance
> service as provided by platform firmware, as well as the supervisor-level
> controller interface exposed to the operating system. The bindings also document
> how CPU nodes reference performance domains managed by RPMI.
>
> The final patch builds on these definitions by introducing a cpufreq driver that
> leverages the RPMI performance service to manage CPU frequency scaling on RISC-V
> systems. The driver supports RPMI access through SBI-based transport mechanisms
> as well as dedicated supervisor-mode transports.
>
> RPMI specification reference [1] and [2]
>
> Test Environment is as follows:
> https://github.com/yeongjoshua/linux/tree/v6.19-rc4/rpmi-performance
> https://github.com/riscv-software-src/opensbi
> https://github.com/yeongjoshua/qemu/tree/rpmi-dev-upstream
>
> Use '-M virt -M rpmi=true' when running qemu
>
> [1] https://github.com/riscv-non-isa/riscv-sbi-doc/releases
> [2] https://github.com/riscv-non-isa/riscv-rpmi/releases
>
> Joshua Yeong (5):
>   dt-bindings: firmware: Add RPMI performance service message proxy
>     bindings
>   dt-bindings: firmware: Add RPMI performance service bindings
>   dt-bindings: riscv: cpus: document performance-domains property
>   cpufreq: Add cpufreq driver for the RISC-V RPMI performance service
>     group
>   MAINTAINERS: Add RISC-V RPMI performance service group


Hi Joshua,

I have a general question -  RPMI performance service group is
primarily defined for devices but can also be used for CPUs.
Do you plan to add a RPMI devfreq driver too for devices?

Thanks
Rahul