[U-Boot] pfuze100 regulator returning wrong values

[Adam Ford]

I have an i.MX6Q powered by the pfuze100 regulator with DM_PMIC,
DM_REGULATOR, and OF_CONTROL enabled along wtih CMD_REGULATOR and
CMD_PMIC.

Our device tree is configured to use the minimum and max voltage
ratings for the parts on the board, and not the absolute min and max
ratings for the PMIC itself.

For example, I have the device tree setup for one regulator as follows:

sw2_reg: sw2 {
     regulator-min-microvolt = <3300000>;
     regulator-max-microvolt = <3300000>;
     regulator-name = "gen_3v3";
     regulator-boot-on;
     regulator-always-on;
};

However, when I read the value  with 'regulator dev gen_3v3; regulator
status' it returns 4550000 which exceeds the max value.  Physically
reading this voltage on a scope show the correct value, so the PMIC is
regulating to what I want and expect.

When I look at the regulator driver, it appears as if we're taking the
value returned from the PMIC, masking it off, multiplying it by the
value of step, then adding it the min_uV value, but this seems wrong
if min = max.

If print the value of min_uV, it matches the minimum value from the
device tree.  Since the Min and max are both the same, adding anything
to the min value would exceed the max.

I compared this to the Linux driver, and the Linux driver has some
hard-coded values that it uses for min and max as opposed to using the
device tree, however, if I try to overrride the values of min_uV by
replacing them with the value passed from the Linux driver, it still
returns an incorrect value.  I've tried to disect the Linux driver,
but I haven't been able to figure out excactly how it determines the
values.  When I am in Linux, however, the returned values are correct,
so Linux is doing something correct, whereas the U-Boot isn't.

Might someone have any suggestions?

for sure the switching regulators are wrong.  I haven't fully tested
all the regulators.

adam