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Subject[PATCH] thermal: allow creating hwmon for thermal zones on OF systems
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.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.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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