[Patch v5 6/6] dt-bindings: thermal: Add dt binding for QCOM LMh

From: Thara Gopinath
Date: Mon Aug 09 2021 - 15:16:36 EST


Add dt binding documentation to describe Qualcomm
Limits Management Hardware node.

Signed-off-by: Thara Gopinath <thara.gopinath@xxxxxxxxxx>
---

v4->v5:
- Renam
v3->v4:
- Changed dt property qcom,lmh-cpu-id to qcom,lmh-cpu and made it
a phandle pointing to the cpu node instead of a number as per
Rob Herring's review comments.
- Added suffix -millicelsius to all temperature properties as per
Rob Herring's review comments.
- Dropped unnecessary #includes in the example as pointed out by Bjorn.
- Other minor fixes.

.../devicetree/bindings/thermal/qcom-lmh.yaml | 82 +++++++++++++++++++
1 file changed, 82 insertions(+)
create mode 100644 Documentation/devicetree/bindings/thermal/qcom-lmh.yaml

diff --git a/Documentation/devicetree/bindings/thermal/qcom-lmh.yaml b/Documentation/devicetree/bindings/thermal/qcom-lmh.yaml
new file mode 100644
index 000000000000..289e9a845600
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/qcom-lmh.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2021 Linaro Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/qcom-lmh.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Limits Management Hardware(LMh)
+
+maintainers:
+ - Thara Gopinath <thara.gopinath@xxxxxxxxxx>
+
+description:
+ Limits Management Hardware(LMh) is a hardware infrastructure on some
+ Qualcomm SoCs that can enforce temperature and current limits as
+ programmed by software for certain IPs like CPU.
+
+properties:
+ compatible:
+ enum:
+ - qcom,sdm845-lmh
+
+ reg:
+ items:
+ - description: core registers
+
+ interrupts:
+ maxItems: 1
+
+ '#interrupt-cells':
+ const: 1
+
+ interrupt-controller: true
+
+ cpus:
+ description:
+ phandle of the first cpu in the LMh cluster
+ $ref: /schemas/types.yaml#/definitions/phandle
+
+ qcom,lmh-temp-arm-millicelsius:
+ description:
+ An integer expressing temperature threshold at which the LMh thermal
+ FSM is engaged.
+
+ qcom,lmh-temp-low-millicelsius:
+ description:
+ An integer expressing temperature threshold at which the state machine
+ will attempt to remove frequency throttling.
+
+ qcom,lmh-temp-high-millicelsius:
+ description:
+ An integer expressing temperature threshold at which the state machine
+ will attempt to throttle the frequency.
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - '#interrupt-cells'
+ - interrupt-controller
+ - cpus
+ - qcom,lmh-temp-arm-millicelsius
+ - qcom,lmh-temp-low-millicelsius
+ - qcom,lmh-temp-high-millicelsius
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ lmh@17d70800 {
+ compatible = "qcom,sdm845-lmh";
+ reg = <0x17d70800 0x400>;
+ interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
+ cpus = <&CPU4>;
+ qcom,lmh-temp-arm-millicelsius = <65000>;
+ qcom,lmh-temp-low-millicelsius = <94500>;
+ qcom,lmh-temp-high-millicelsius = <95000>;
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ };
--
2.25.1