[PATCH v3] PM / devfreq: Add HiSilicon uncore frequency scaling driver

[Jie Zhan]

Sorry, my bad.  Please ignore this one.

Keep onto this v3 thread: https://lore.kernel.org/linux-pm/20250521104956.2780150-1-zhanjie9@hisilicon.com/

Jie

On 22/05/2025 11:17, Jie Zhan wrote:
> Add the HiSilicon uncore frequency scaling driver for Kunpeng SoCs based on
> the devfreq framework.  The uncore domain contains shared computing
> resources, including system interconnects and L3 cache.  The uncore
> frequency significantly impacts the system-wide performance as well as
> power consumption.  This driver adds support for runtime management of
> uncore frequency from kernel and userspace.  The main function includes
> setting and getting frequencies, changing frequency scaling policies, and
> querying the list of CPUs whose performance is significantly related to
> this uncore frequency domain, etc.  The driver communicates with a platform
> controller through an ACPI PCC mailbox to take the actual actions of
> frequency scaling.
> 
> Co-developed-by: Lifeng Zheng <zhenglifeng1 at huawei.com>
> Signed-off-by: Lifeng Zheng <zhenglifeng1 at huawei.com>
> Signed-off-by: Jie Zhan <zhanjie9 at hisilicon.com>
> ---
> v3:
> - Remove redundant resource freeing processes when drv->probe() fails as
>   they're already handled by devm
> 
> v2:
> https://lore.kernel.org/linux-pm/20250520074120.4187096-1-zhanjie9@hisilicon.com/
> - Make devm manage the release sequence, remove drv->remove()
> - Warn on !uncore or !uncore->pchan as they're no longer expected
> - Remove ioremap of pcc shared memory because it's done by the pcc driver
> - Fix compiler warning of discarding 'const'
> - Minor trivial coding style changes
> 
> v1:
> https://lore.kernel.org/linux-pm/20250506021434.944386-1-zhanjie9@hisilicon.com/
> ---
>  drivers/devfreq/Kconfig            |  11 +
>  drivers/devfreq/Makefile           |   1 +
>  drivers/devfreq/hisi_uncore_freq.c | 722 +++++++++++++++++++++++++++++
>  3 files changed, 734 insertions(+)
>  create mode 100644 drivers/devfreq/hisi_uncore_freq.c