> > 2) Specify SH_PFC_PIN_CFG_IO_VOLTAGE for every line that belongs to > > the interface, keep the SD card pin groups as specified by this > > patch, map all of the pins to the same bit in the POC register (as > > per pin_to_pocctrl is concerned), and the board specific device tree > > definitions would look like every other RZ/G1 or R-Car Gen2 boards > > that support SDR* The only downside would be that the kernel would > > read-modify-write the POC Control Register with the same value for > > every line in the interface. I don't think this multiple RMW is a problem. > This looks the most sensible solution to me: just map in your > .pin_to_pocctrl() method all pins of the interface to the single bit. I didn't fully get if this one bit controls only the CLK wire or all the relevant wires? I assume it is the latter one. For that, option 2) is totally fine with me.
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