On 11/27/20 8:35 AM, gao.yunxiao6@xxxxxxxxx wrote:
From: "jeson.gao" <jeson.gao@xxxxxxxxxx>
virtual thermal node definition description in dts file
Signed-off-by: jeson.gao <jeson.gao@xxxxxxxxxx>
---
.../thermal/sprd-virtual-thermal.yaml | 38 +++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 Documentation/devicetree/bindings/thermal/sprd-virtual-thermal.yaml
diff --git a/Documentation/devicetree/bindings/thermal/sprd-virtual-thermal.yaml b/Documentation/devicetree/bindings/thermal/sprd-virtual-thermal.yaml
new file mode 100644
index 000000000000..3e3d2282e2a4
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/sprd-virtual-thermal.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/sprd-virtual-thermal.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Spreadtrum virtual thermal driver bindings
+
+maintainers:
+ - Yunxiao Gao <gao.yunxiao6@xxxxxxxxx>
+
+properties:
+ compatible:
+ const: sprd,virtual-thermal
+
+ reg:
+ description: specify the virtual sensor id.
+ maxItems: 1
+
+ thmzone-names:
+ description: specify per-core thermal zone name.
+
+required:
+ - compatible
+ - reg
+ - thmzone-names
+
+additionalProperties: false
+
+examples:
+ - |
+ virtual_sensor: virtual-sensor@1 {
+ compatible = "sprd,virtual-thermal";
+ reg = <1>;
+ thmzone-names = "ank0-thmzone","ank1-thmzone","ank2-thmzone",
+ "ank3-thmzone","ank4-thmzone","ank5-thmzone","prometheus6-tzone0",
+ "prometheus6-tzone1","prometheus7-thmzone";
+ };
It's coming back. There were attempts to solve this problem.
Javi tried to solved this using hierarchical thermal zones [1].
It was even agreed (IIRC during LPC) but couldn't continue. Then Eduardo
was going to continue this (last message at [3]). Unfortunately,
development stopped.
I also have out-of-tree similar implementation for my Odroid-xu4,
which does no have an 'SoC' sensor, but have CPU sensors and needs
some aggregation function to get temperature.
I can pick up Javi's patches and continue 'hierarchical thermal zones'
approach.
Javi, Daniel, Rui what do you think?
Regards,
Lukasz
[1] https://lwn.net/Articles/666015/
[2]
https://patchwork.kernel.org/project/linux-pm/patch/1448464186-26289-2-git-send-email-javi.merino@xxxxxxx/
[3]
https://patchwork.kernel.org/project/linux-pm/patch/1448464186-26289-3-git-send-email-javi.merino@xxxxxxx/
[4]
https://patchwork.kernel.org/project/linux-pm/patch/1448464186-26289-4-git-send-email-javi.merino@xxxxxxx/
[5]
https://patchwork.kernel.org/project/linux-pm/patch/1448464186-26289-5-git-send-email-javi.merino@xxxxxxx/
