on rk3399 platform, there is dfi conroller can monitor
ddr load, base on this result, we can do ddr freqency
scaling.
Signed-off-by: NLin Huang <hl@rock-chips.com>
Signed-off-by: NMyungJoo Ham <myungjoo.ham@samsung.com>
Acked-by: NChanwoo Choi <cw00.choi@samsung.com>