> MTK I2C HW has some limitation. > 1. If the i2c_msg number is more than one, STOP will be issued instead of > RS(Repeat Start) between each message. > > 2. Mediatek I2C controller support WRRD(write then read) mode, in WRRD > mode the Repeat Start will be issued between 2 messages. > In this driver if 2 messages is first write then read, the driver will > combine 2 messages using Write-Read mode so the RS will be issued between > the 2 messages. > Ex: W/R/R, driver will combine first W/R and then R. > > 3. Due to HW limitation, in this version the max transfer data length is 255 > in one message. This looks to me more like an SMBUS controller instead of I2C. Maybe you should populate smbus_xfer rather than master_xfer? > MT8135 and MT6589 can control I2C pins on PMIC(MT6397) by setting the i2c > registers in MT8135 side. I still didn't get this, even after reading the mail thread of old series. Can someone maybe draw me a nice ASCII picture showing the setup which is going on here?
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