Re: [PATCH v4 2/2] arm64: dts: sc7180: Add required-opps for i2c
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From: Bjorn Andersson <hidden>
Date: 2021-07-16 20:52:21
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linux-arm-msm, linux-devicetree, lkml
On Fri 16 Jul 15:21 CDT 2021, Stephen Boyd wrote:
Quoting Bjorn Andersson (2021-07-16 13:18:56)quoted
On Fri 16 Jul 05:00 CDT 2021, Rajendra Nayak wrote:quoted
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...quoted
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 CX.
On e.g. sm8250 the first available non-zero corner presented in cmd-db is low_svs. And if this (which?) clock requires a higher corner than the lowest possible in order to tick at this "lowest" frequency, I'm certainly interested in some more details. Regards, Bjorn