From: Emilio López emi...@elopez.com.ar
This patch adds support for the DMA engine present on Allwinner A10,
A13, A10S and A20 SoCs. This engine has two kinds of channels: normal
and dedicated. The main difference is in the mode of operation;
while a single normal channel may be operating at any
sun7i-a20-bananapi.dts doesn't contain regulator nodes for the AXP209 PMU
driver, so add them to allow for voltage-scaling with cpufreq-dt. With the
regulators enabled, we can define board-specific operating points. The defined
CPU voltages are more conservative (based on the values used by the
