PPI_STARTPPI
tc358762_write(ctx, PPI_STARTPPI, PPI_START_FUNCTION);
tc358764_write(ctx, PPI_STARTPPI, PPI_START_FUNCTION);
regmap_write(tc->regmap, PPI_STARTPPI, PPI_START_FUNCTION);
case PPI_STARTPPI:
d2l_write(tc->i2c, PPI_STARTPPI, PPI_START_FUNCTION);
rpi_touchscreen_write(ts, PPI_STARTPPI, 0x01);