On Mon, Oct 07, 2019 at 10:50:21PM +0200, Stephan Gerhold wrote: > MMS345L is another first generation touch screen from Melfas, > which uses the same registers as MMS152. > > However, using I2C_M_NOSTART for it causes errors when reading: > > i2c i2c-0: sendbytes: NAK bailout. > mms114 0-0048: __mms114_read_reg: i2c transfer failed (-5) > > The driver works fine as soon as I2C_M_NOSTART is removed. > > Add a separate melfas,mms345l binding, and make use of I2C_M_NOSTART > only for MMS114 and MMS152. > > Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx> > --- > Note: I was not able to find a datasheet for any of the models, > so this change is merely based on testing and comparison with > the downstream driver [1]. > > There was a related patch [2] that removes I2C_M_NOSTART for all models, > but it seems abandoned and I do not have any other model for testing. > Therefore, this patch implements the least instrusive solution > and only removes I2C_M_NOSTART for MMS345L. Hmm, at this point I am inclined to pick up Andi's patch since it seems to work for you and him and it looks like Android drivers are not using I2C_M_NOSTART. I wonder if this was some quirk/big on the platform where it was originally developed. Any objections? Thanks. -- Dmitry
