Re: [PATCH v4 2/2] arm64: dts: sc7180: Add required-opps for i2c
From: Stephen Boyd
Date: Fri Jul 16 2021 - 16:21:37 EST
Quoting Bjorn Andersson (2021-07-16 13:18:56)
> On Fri 16 Jul 05:00 CDT 2021, Rajendra Nayak wrote:
> > qup-i2c devices on sc7180 are clocked with a fixed clock (19.2 MHz)
> > Though qup-i2c does not support DVFS, it still needs to vote for a
> > performance state on 'CX' to satisfy the 19.2 Mhz clock frequency
> > requirement.
> Sounds good, but...
> > Use 'required-opps' to pass this information from
> > device tree, and also add the power-domains property to specify
> > the CX power-domain.
> ..is the required-opps really needed with my rpmhpd patch in place?
Yes? Because rpmhpd_opp_low_svs is not the lowest performance state for