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?
Even for opp-v2, they are not documented in
Documentation/devicetree/bindings/opp/opp.txt, but cpu-supply is used in
the examples?
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?
Can you please document these properties?
Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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