mmDC_I2C_DATA
dm_write_reg(ctx, mmDC_I2C_DATA, value);
dm_write_reg(ctx, mmDC_I2C_DATA, value);
dm_write_reg(engine->base.ctx, mmDC_I2C_DATA, value);
value = dm_read_reg(engine->base.ctx, mmDC_I2C_DATA);