Re: [PATCH v2 2/2] Documentation: devicetree: Add boost-frequency binding to list boost mode frequency

Thomas Abraham
2014-02-08T06:47:12Z

On Fri, Feb 7, 2014 at 11:32 PM, Sudeep Holla <Sudeep.Holla@arm.com> wrote:
> On 07/02/14 17:37, Nishanth Menon wrote:
>> On Fri, Feb 7, 2014 at 11:31 AM, Sudeep Holla <Sudeep.Holla@arm.com> wrote:
>
> [...]
>
>>> Yes I think its counter-intuitive as it's visible to the userspace(list of
>>> frequencies and the boost parameters are exposed through sysfs)
>>
>> That will be a different problem -> as currently every single
>> frequency in the cpufreq list has ability to be marked as boost
>> frequency - if userspace does not maintain that, then, IMHO, fix the
>> userspace :D
>>
>
> /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies gives
> the list of frequencies based on the state of the boost feature at anytime.

The list of frequencies in
/sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies
does not change based in the state of the boost feature (enabled or
disabled). But the scaling_max_frequency and scaling_min_frequency are
updated based on the set of available + boost frequencies available.

>
> Intuitively the list without boost shouldn't have any frequency above the range
> when it's enabled :), that's what I was referring to. So I am not talking about
> any issue with user-space maintenance.
>
> Regards,
> Sudeep
>