On Tue, Sep 2, 2014 at 2:09 AM, Stefan Wahren [off-list ref] wrote:

thanks again. Now i unterstand much more, but otherwise the portation won't
be straight forward. The old source in drivers/regulator/mxs-regulator.c
needs a low level part located in arch/arm/plat-mx28/power.c . As far as i
know, the low level part needs to move into the devicetree binding and into
the mxs-regulator.c . Am i right?

Yes, I think you are right.

Yesterday i had looked into the mx28 reference manual and into the low level
part of the mxs regulator. The reference manual defines four voltage
regulators: vddd, vdda, vddio and vddmem plus a overall current regulator.
But the low level part make use of vddd, vdda, vddio, vddio_bo and the
overall current.

Do i need the brown out regulator (vddio_bo) and the vddmem?

As far as I understand vddmem is not used on mx28evk. From the mx28
reference manual;

"11.12.8 VDDMEM Supply Targets Control Register
(HW_POWER_VDDMEMCTRL)
This register controls the voltage target for a memory supply
generated from VDDA. This
supply is intended for use with external memories such as LV-DDR that
have unique voltage
requirements not compatible with VDDIO, VDDA , or VDDD."