Re: [PATCH v4 2/2] arm64: dts: sc7180: Add required-opps for i2c

Quoting Rajendra Nayak (2021-07-16 03:00:58)

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.

Use 'required-opps' to pass this information from
device tree, and also add the power-domains property to specify
the CX power-domain.

Signed-off-by: Rajendra Nayak <redacted>
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Reviewed-by: Stephen Boyd <redacted>