linux-kernel - Re: [PATCH] thermal: allow creating hwmon for thermal zones on OF systems

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Date:	Tue, 21 Apr 2015 15:17:03 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Zhang Rui <rui.zhang@...el.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] thermal: allow creating hwmon for thermal zones on OF systems

On Mon, Apr 20, 2015 at 5:21 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> Current implementation forcibly suppresses creation of hwmon instances
> for thermal zones defined in device tree data. Let's add a new property,
> "linux,hwmon" to allow marking certain thermal zones as needing generic
> hwmon interface.

What is the decision process for deciding to add this property or not?


> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  Documentation/devicetree/bindings/thermal/thermal.txt | 4 ++++
>  drivers/thermal/of-thermal.c                          | 7 +++++--
>  2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt b/Documentation/devicetree/bindings/thermal/thermal.txt
> index 8a49362..0106f8f 100644
> --- a/Documentation/devicetree/bindings/thermal/thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/thermal.txt
> @@ -174,6 +174,10 @@ Optional property:
>                         2000mW, while on a 10'' tablet is around
>                         4500mW.
>
> +- linux,hwmon:         A boolean property that instructs Linux thermal core
> +                       to create an instance of hwmon device representing
> +                       this thermal zone.
> +
>  Note: The delay properties are bound to the maximum dT/dt (temperature
>  derivative over time) in two situations for a thermal zone:
>  (i)  - when passive cooling is activated (polling-delay-passive); and
> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> index 9e8c614..7b7a70c 100644
> --- a/drivers/thermal/of-thermal.c
> +++ b/drivers/thermal/of-thermal.c
> @@ -891,8 +891,11 @@ int __init of_parse_thermal_zones(void)
>                         goto exit_free;
>                 }
>
> -               /* No hwmon because there might be hwmon drivers registering */
> -               tzp->no_hwmon = true;
> +               /*
> +                * Do not attach hwmon device unless explicitly requested,
> +                * since there might be dedicated hwmon drivers registering.
> +                */
> +               tzp->no_hwmon = !of_property_read_bool(child, "linux,hwmon");
>
>                 if (!of_property_read_u32(child, "sustainable-power", &prop))
>                         tzp->sustainable_power = prop;
> --
> 2.2.0.rc0.207.ga3a616c
>
>
> --
> Dmitry
--
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