On 17-07-18, 09:46, Geert Uytterhoeven wrote:
> Hi Viresh,
>
> CC device-tree folks
>
> Replying to an old email, because that's the most accurate reference I
> could find.
>
> On Tue, Feb 9, 2016 at 6:06 AM Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
> > OPP core can handle the regulators by itself, and but it needs to know
> > the name of the regulator to fetch. Add support for that.
> >
> > Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> > ---
> > drivers/cpufreq/cpufreq-dt.c | 46 ++++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 46 insertions(+)
> >
> > diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
> > index 4c9f8a828f6f..2af75f8088bb 100644
> > --- a/drivers/cpufreq/cpufreq-dt.c
> > +++ b/drivers/cpufreq/cpufreq-dt.c
>
> > @@ -119,6 +120,30 @@ static int set_target(struct cpufreq_policy *policy, unsigned int index)
> > return ret;
> > }
> >
> > +/*
> > + * An earlier version of opp-v1 bindings used to name the regulator
> > + * "cpu0-supply", we still need to handle that for backwards compatibility.
> > + */
> > +static const char *find_supply_name(struct device *dev, struct device_node *np)
> > +{
> > + struct property *pp;
> > + int cpu = dev->id;
> > +
> > + /* Try "cpu0" for older DTs */
> > + if (!cpu) {
> > + pp = of_find_property(np, "cpu0-supply", NULL);
> > + if (pp)
> > + return "cpu0";
> > + }
> > +
> > + pp = of_find_property(np, "cpu-supply", NULL);
> > + if (pp)
> > + return "cpu";
>
> Despite the existence of lots of users of these properties, I couldn't find
> both the "earlier version" and the "current version" of the opp-v1 bindings
> documenting the "cpu0-supply" and "cpu-supply" properties?
They are part of the device nodes and don't fall under the
jurisdiction of OPP tables and so aren't defined there. We rely on the
"<name>-supply" property from the regulator bindings for the devices.
> Even for opp-v2, they are not documented in
> Documentation/devicetree/bindings/opp/opp.txt, but cpu-supply is used in
> the examples?
Same reasoning here as well.
> For v2, I did find "[PATCH 01/16] PM / OPP: Add 'supply-names' binding"
> https://lore.kernel.org/lkml/2b87b162eabd1570ae2311e1ef8655acda72f678.1441972771.git.viresh.kumar@xxxxxxxxxx/
> but presumably that's an even further evolution?
Yeah, that never made it to mainline is abandoned.
> Can you please document these properties?
I don't think we need to, do we ?
--
viresh
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