On Tue, Mar 11, 2014 at 04:15:02PM +0000, Ben Dooks wrote: > I have noticed the following behaviour with the i2c-rcar driver > with the following single i2c_msg structure: > > msg[0].addr = 0x12; > msg[0].flags = I2C_M_RD; > msg[0].len = 0; > msg[0].buf = data; > > The system issues an address transaction followed by a single byte > read. This fits to my observation that the rcar driver cannot do SMBUS_QUICK (e.g. via i2cdetect). I assumed that handling a length of 0 is broken. I haven't had a deeper look yet, so I can't say much. So, you either go for it yourself, or you wait until I posted my IIC enablement series for Lager. Then, you can switch to the IIC core with the sh_mobile driver. That one does SMBUS_QUICK correctly. Regards, Wolfram
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