> > + /* FM+ needs lower SMD and no filters */ > > + priv->smd /= 2; > > + cdf = 0; > > Is this documented somewhere in the R-Car Gen4 docs? Sadly, there are no recommended values for FM+ in the docs. With cdf=6, I got speeds around 800kHz. After seeing the BSP also uses cdf=0, I got speeds close to 1MHz. There is a note in Gen3 and later docs for ICCCR2 saying that cdf=0 is recommended for devices with a data hold time less than 100ns. I don't have the PMIC docs here to verify if that is the case here. However, I recalled there are some generic filter bindings for I2C. I will check if we can make use of them here.
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