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How to provide 1.8v VDDI to MIPI LCD for MIPI display?

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Posted at 5/12/2018 15:05:59     
I have one LCD and I want to use it with Firefly-RK3399 development board. According to datasheet http://pdf-datasheet.datasheet.n ... ICE-GB1-INNOLUX.pdf ,LCD needs 1.8v VDDI on pin-25 and pin-27. After checking Firefly-RK3399_V10_SCH(2017-2-8).pdf's page 29, "DVP/MIPI_Interface" section, it seems there is no direct 1.8v pin wired into J26.

I have two ideas to proceed:
  option-1: Convert VCC_3V0(5v) to 1.8v by additinal DC-DC.
  option-2: Wire one pin 1.8v from development board to LCD, and config this wiring in DTS to let mipi driver control VDDI(1.8v) output during "Power on/off Sequence".

Questions:
  1. Can option-1 work?
  2. Is option-2 possible? Any suggestion or guide?

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