Re: [PATCH 2/3] arm64: dts: ti: k3-j7200: Add the supported frequencies for A72

[Kumar, Udit]

On 8/10/2023 6:23 PM, Nishanth Menon wrote:
> On 17:23-20230810, Kumar, Udit wrote:
> [..]
> > > > +		opp1-750000000 {
> > > > +			opp-hz = /bits/ 64 <750000000>;
> > > >    		};
> > > >    	};
> > > > --
> > > > 2.34.1
> > > [..]
> > > This wont work:
> > >
> > > a) in u-boot's falcon boot mode and puts unrelated responsibility to
> > > bootloader (u-boot is not the only bootloader in the party here).
> > > b) Further, the reason for doing the opp detection in the kernel is
> > > due to the severity of consequence of attempting to run a lower rated
> > > chip at higher frequency - PoH (Power on Hours) or physical damage can
> > > result.
> > > c) Finally, in a virtualized environment: TISCI will get DM (Device
> > > Manager) to arbitrate between the each of the VM's request, but if
> > > the VM's are'nt self sufficient, we will have DM making wrong choices
> > > resulting in (b) condition again.
> > >
> > > This is the reason why drivers/cpufreq/ti-cpufreq.c exists and all SoCs
> > > that have OPPs from TI is handled in the kernel itself.

Thanks to pointing to this driver.