From: Eduardo Valentin <edubezval@gmail.com>
To: Javi Merino <javi.merino@arm.com>
Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
rui.zang@intel.com, Zhang Rui <rui.zhang@intel.com>
Subject: Re: [PATCH v2 2/3] thermal: of: parse stacked thermal zones from device tree
Date: Wed, 4 Nov 2015 10:56:34 -0800 [thread overview]
Message-ID: <20151104185633.GC12825@localhost.localdomain> (raw)
In-Reply-To: <1446658662-19582-3-git-send-email-javi.merino@arm.com>
On Wed, Nov 04, 2015 at 05:37:41PM +0000, Javi Merino wrote:
> Let device tree set thermal zones in the thermal-sensors list of
> phandles and set up the thermal zone hierarchy based on the information
> present there.
>
> Cc: Zhang Rui <rui.zhang@intel.com>
> Cc: Eduardo Valentin <edubezval@gmail.com>
> Signed-off-by: Javi Merino <javi.merino@arm.com>
> ---
> .../devicetree/bindings/thermal/thermal.txt | 154 ++++++++++++++++++++-
> drivers/thermal/of-thermal.c | 99 +++++++++++++
Please split this patch.
> 2 files changed, 250 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt b/Documentation/devicetree/bindings/thermal/thermal.txt
> index 41b817f7b670..52b7e9ae3b4d 100644
> --- a/Documentation/devicetree/bindings/thermal/thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/thermal.txt
> @@ -145,9 +145,12 @@ Required properties:
> Size: one cell
>
> - thermal-sensors: A list of thermal sensor phandles and sensor specifier
> - Type: list of used while monitoring the thermal zone.
> - phandles + sensor
> - specifier
> + Type: list of used while monitoring the thermal zone. The phandles
> + phandles + sensor can point to thermal sensors or other thermal zone
> + specifier nodes. If it points to other thermal zone
> + nodes you should omit the sensor specifier
> + and set #thermal-sensor-cells to 0 for the
> + thermal zone.
>
> - trips: A sub-node which is a container of only trip point nodes
> Type: sub-node required to describe the thermal zone.
> @@ -603,3 +606,148 @@ thermal-zones {
> The above example is a mix of previous examples, a sensor IP with several internal
> sensors used to monitor different zones, one of them is composed by several sensors and
> with different cooling devices.
> +
> +(e) Board thermal with stacked thermal zones
> +
> +Instead of setting up one thermal zone combining multiple thermal
> +zones and multiple trip points for each cooling device, we can create
> +a hierarchy of thermal zones.
> +
> +#include <dt-bindings/thermal/thermal.h>
> +
> +&i2c1 {
> + ...
> + /*
> + * An IC with several temperature sensor.
> + */
> + adc_dummy: sensor@0x50 {
> + ...
> + #thermal-sensor-cells = <1>; /* sensor internal ID */
> + };
> +};
> +
> +thermal-zones {
> +
> + cpu_thermal: cpu_thermal {
> + polling-delay-passive = <1000>; /* milliseconds */
> + polling-delay = <2500>; /* milliseconds */
> +
> + sustainable-power = <2500>;
> +
> + thermal-sensors = <&adc_dummy 0>
> +
> + trips {
> + cpu_trip: cpu-trip {
> + temperature = <60000>; /* millicelsius */
> + hysteresis = <2000>; /* millicelsius */
> + type = "passive";
> + };
> + };
> +
> + cooling-maps {
> + map0 {
> + trip = <&cpu_trip>;
> + cooling-device = <&cpu0 0 2>;
> + };
> + };
> + };
> +
> + gpu_thermal: gpu_thermal {
> + polling-delay-passive = <1000>; /* milliseconds */
> + polling-delay = <2500>; /* milliseconds */
> +
> + sustainable-power = <2500>;
> +
> + thermal-sensors = <&adc_dummy 2>
> +
> + trips {
> + gpu_trip: gpu-trip {
> + temperature = <55000>; /* millicelsius */
> + hysteresis = <2000>; /* millicelsius */
> + type = "passive";
> + }
> + };
> +
> + cooling-maps {
> + map0 {
> + trip = <&gpu_trip>;
> + cooling-device = <&gpu0 0 2>;
> + };
> + };
> + };
> +
> + lcd_thermal: lcd_thermal {
> + polling-delay-passive = <1000>; /* milliseconds */
> + polling-delay = <2500>; /* milliseconds */
> +
> + sustainable-power = <2500>;
> +
> + thermal-sensors = <&adc_dummy 1>
> +
> + trips {
> + lcd_trip: lcp-trip {
> + temperature = <53000>; /* millicelsius */
> + hysteresis = <2000>; /* millicelsius */
> + type = "passive";
> + };
> + };
> +
> + cooling-maps {
> + map0 {
> + trip = <&lcd_trip>;
> + cooling-device = <&lcd0 5 10>;
> + };
> + };
> + };
> +
> + board_thermal: board-thermal {
> + polling-delay-passive = <1000>; /* milliseconds */
> + polling-delay = <2500>; /* milliseconds */
> +
> + thermal-sensors = <&cpu_thermal &gpu_thermal &lcd_thermal>
> +
(no, I have not grepped the device tree)
Was there any other occurrence of such construction ?
It just looks awkward that one property holds two types of data. Is DT
strongly typed?
I would say, following the DT pattern, one would expect to have the
binding to allow one thermal zone to be written inside another thermal
zone, no?
next prev parent reply other threads:[~2015-11-04 18:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-04 17:37 [PATCH v2 0/3] Hierarchical thermal zones Javi Merino
2015-11-04 17:37 ` [PATCH v2 1/3] thermal: Add support for hierarchical " Javi Merino
2015-11-04 18:51 ` Eduardo Valentin
2015-11-09 15:20 ` Javi Merino
2015-11-04 17:37 ` [PATCH v2 2/3] thermal: of: parse stacked thermal zones from device tree Javi Merino
2015-11-04 18:56 ` Eduardo Valentin [this message]
2015-11-09 14:52 ` Javi Merino
2015-11-04 17:37 ` [PATCH v2 3/3] thermal: show the sub thermal zones in sysfs Javi Merino
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