Messages in this thread | | | Date | Sun, 24 Jan 2016 12:29:16 +0100 | From | Wolfram Sang <> | Subject | Re: [PATCH V7 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit |
| |
Hi,
> "If this is the last message in a group, it is followed by a STOP. > Otherwise it is followed by the next @i2c_msg transaction segment, > beginning with a (repeated) START"
This is correct.
> So the expectation is that there is no 'STOP' bit inbetween individual > i2c_msg segments with repeated 'START'. The QUP i2c hardware has no way > to inform that there should not be a 'STOP' at the end of transaction. > The only way to implement this is to coalesce all the i2c_msg in i2c_msgs > in to one transaction and transfer them. Adding the support for the same.
So, there will not be a REP_START condition on the bus? I am sorry to say that I can't accept this. A REP_START is a REP_START and nothing else. There are devices which will get confused if there is no real REP_START condition.
Without knowing the HW in detail, can't you implement I2C_M_NOSTART and let the touchscreen driver use it via regmap? That would be the proper way (from what I understand).
Regards,
Wolfram
[unhandled content-type:application/pgp-signature] | |