Hi Mark,
Am Montag, den 10.02.2014, 13:15 +0000 schrieb Mark Brown:
> On Thu, Feb 06, 2014 at 03:43:32PM +0100, Philipp Zabel wrote:
> > The ARM, PU, and SOC LDOs in the i.MX6 PMU can completely gate
> > their power output. Since power gating is configured by writing
> > zero to the voltage target bitfield,, store a copy of the
> > voltage selector to be restored when reenabling the regulator.
>
> This is mostly good but...
>
> > static int anatop_regmap_set_voltage_sel(struct regulator_dev *reg,
> > unsigned selector)
> > {
> > struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
> > + int ret;
> >
> > if (!anatop_reg->control_reg)
> > return -ENOTSUPP;
> >
> > - return regulator_set_voltage_sel_regmap(reg, selector);
> > + ret = regulator_set_voltage_sel_regmap(reg, selector);
> > + if (!ret)
> > + anatop_reg->sel = selector;
> > + return ret;
> > }
>
> ...I don't understand this. If the regulator is disabled won't this
> cause it to be reenabled since we just write the stored selector in to
> do that? What I'd expect to see happening is the data being written to
> the cache always and only written to the hardware if it's enabled.
yes, thanks. I'll fix this. What should happen if the
regulator_set_voltage_sel_regmap fails? Is it ok to still
set the cache in this case?
> > +static int anatop_regmap_disable(struct regulator_dev *reg)
> > +{
> > + struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
> > +
> > + if (!anatop_is_core_reg(anatop_reg))
> > + return -ENOTSUPP;
> > +
> > + return regulator_set_voltage_sel_regmap(reg, LDO_POWER_GATE);
> > +}
>
> It's starting to seem like it's worth having separate ops for the core
> regulator rather than all these conditionals.
Will do.
regards
Philipp
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