Re: Dynamic power management

Re: Dynamic power management

[Viresh Kumar]

On 28-05-21, 10:17, Pankaj  Vinodrao Joshi wrote:
> Hi,
> 
> I am working with the new architecture which is new in the market and is not
> fully mature with respect to the dynamic PM. I believe following are the
> frameworks available with dynamic power management but currently i am using
> cpufreq framework only

It isn't all about architectures but the eventual platforms as well and if they
need these parts.

> CPUfreq, Devfreq

This is for scaling the frequency of the devices, like CPUs, GPUs, etc. If you
want/need that or not is for you to decide.

> OPP

This is only a way of passing the valid frequency-voltage pairs to the other
frameworks via device tree, like cpufreq. Again if you need to use them.

> Genpd

This is an important part for runtime PM, this enables disables power to various
parts of the platform/SoC (or group of IPs). You need to have this kind of
architecture and registers to enable/disable power to certain parts of the SoC.

> Runtime PM

This eventually enables/disables genpd/regulators/clocks only, need driver
specific hooks.

> Clocks

This is for enabling/disabling clock to IPs.

> Regulators

to control voltage regulators, change their levels and enable/disable them.

> Can someone guide me if i want support for all above framework what and all
> support i should have ? What is SoC side and kernel side dependency implement
> above frameworks?? Kindly help.

Just look at them one by one, you will see plenty of examples of platforms doing
it. There may not be a lot of architecure specific stuff here, but platform
specific.

-- 
viresh

Re: Dynamic power management

[Viresh Kumar]

Are bhai, you need to register on the below link. I just gave it to you.. 

http://vger.kernel.org/vger-lists.html

Go here, search for linux-pm, click on subscribe, enter your details


On 31-05-21, 06:57, Pankaj  Vinodrao Joshi wrote:
> Hi Viresh,
> 
> i have tried to send mail to linux-pm but every time there is issue with mail delivery the mail is getting delivered to you but not to the list. Even  i tried to send through gmail too but facing same issue.
> Your message to linux-pm@vger.kernel.org couldn't be delivered.
> vger.kernel.org suspects your message is spam and rejected it.
> Pankaj.VJ       Office 365      vger.kernel.org
> Sender          Action Required
> Messages suspected as spam
> 
> 
> Thanks
> ________________________________
> From: Viresh Kumar <viresh.kumar@linaro.org>
> Sent: Monday, May 31, 2021 12:17 PM
> To: Pankaj Vinodrao Joshi <Pankaj.VJ@exaleapsemi.com>
> Subject: Re: Dynamic power management
> 
> You have send an email to linux-pm list, have you subscribed it at all ? I don't
> think your mail reached to anyone there.
> 
> http://vger.kernel.org/vger-lists.html
> 
> On 31-05-21, 05:22, Pankaj  Vinodrao Joshi wrote:
> > Hi Viresh ,
> >
> > I am working with the new architecture which is new in the market and is not fully mature with respect to the dynamic PM. I believe following are the frameworks available with dynamic power management but currently i am using cpufreq framework only
> >
> > CPUfreq, Devfreq
> > OPP
> > Genpd
> > Runtime PM
> > Clocks
> > Regulators
> >
> > Can you please guide me if i want support for all above framework what and all support i should have ? What is SoC side and kernel side dependency implement above frameworks?? Kindly help.
> >
> >
> > Thanks
> 
> --
> viresh
> [EXT]

-- 
viresh