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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel