[PATCH 4/4] cpufreq: add an Amlogic speed-bin driver

[Christain Stefan Köver-Draxl]

Hi Viresh,
Hi Jerome,

On 10/26/26 09:59, Viresh Kumar wrote:
> On 26-10-26, 09:57, Jerome Brunet wrote:
>> On lun. 26 oct. 2026 at 11:00, Viresh Kumar <viresh.kumar at linaro.org> wrote:
>>
>>> On 25-10-26, 20:22, christian.koever-draxl at student.uibk.ac.at wrote:
>>>> From: Christian Stefan Kövér-Draxl <ckoever at outlook.de>
>>>>
>>>> Every S4 speed bin runs the same CPU frequencies but needs its own
>>>> voltage curve, and the bin can only be read through the secure monitor.
>>>>
>>>> Read the bin from the firmware, select the matching
>>>> "opp-microvolt-speed<bin>" property for all CPUs, then register
>>>> cpufreq-dt. Bins outside the known range fall back to bin 0, which
>>>> has the highest voltages. Like sun50i-cpufreq-nvmem, the driver binds
>>>> on the SoC compatible and needs no node of its own, and S4 is added to
>>>> the cpufreq-dt-platdev blocklist so cpufreq-dt is only created after
>>>> the bin has been applied.
>>>>
>>>> Signed-off-by: Christian Stefan Kövér-Draxl <ckoever at outlook.de>
>>>> ---
>>>>   MAINTAINERS                          |   1 +
>>>>   drivers/cpufreq/Kconfig.arm          |  14 ++
>>>>   drivers/cpufreq/Makefile             |   1 +
>>>>   drivers/cpufreq/amlogic-cpufreq.c    | 184 +++++++++++++++++++++++++++
>>>>   drivers/cpufreq/cpufreq-dt-platdev.c |   2 +
>>>>   5 files changed, 202 insertions(+)
>>>>   create mode 100644 drivers/cpufreq/amlogic-cpufreq.c
>>> Is it safe to apply just this one ? I can take this via the PM tree then.
>> I would advise to wait a little for Amlogic to chime in.

Viresh, thanks, but please don't apply it alone. It would need the 
speed-bin call from patch 3 (meson_sm), and without the CPU clock from 
patch 2 it has nothing to scale.

Best regards,
Christian

> Sure, I wasn't going to wait for the maintainers to respond anyway.
>