Hi, > > > We got confirmation from HW team about 4 byte read limitation. There > > > has to be a STOP after every single read cycle. One read cycle > > > supports maximum of > > > 4 byte burst. I will update the patches with a comment on this. > > > > Could it be that this is more an SMBus controller than an I2C controller? > > I haven't looked at the specs but maybe populating smbus_xfer instead of > > master_xfer is an option here? > I think its more of i2c controller and we do mention " .max_read_len = 4" in > " struct i2c_adapter_quirks". Do you still see something missing here?
Well, if there has to be STOP after a read, then you can't do a transfer containing "write-read-write", or? So, I wondered if this controller is of the type which can mainly do "write-then-read" transfers only (check I2C_AQ_COMB* quirk flags). And for some of those controller types, it might be even easier to drop generic I2C transfers and only handle the SMBUS calls. I didn't check this driver closely yet, so I can't tell if/what it needs from the above. I wanted to give this input already, though. Regards, Wolfram
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