Enable Remote proc cooling support

Documentation/devicetree/bindings/remoteproc/qcom,pas-common.yaml

@@ -77,6 +77,12 @@ properties:
       and devices related to the ADSP.
     unevaluatedProperties: false
 
+  cooling:
+    $ref: /schemas/thermal/qcom,qmi-cooling.yaml#
+    description:
+      Cooling subnode which represents the cooling devices exposed by the Modem.
+    unevaluatedProperties: false
+
 required:
   - clocks
   - clock-names

Documentation/devicetree/bindings/thermal/qcom,qmi-cooling.yaml

@@ -0,0 +1,99 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2023 (c), Linaro Limited
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/qcom,qmi-cooling.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm QMI based thermal mitigation (TMD) cooling devices.
+
+maintainers:
+  - Caleb Connolly <caleb.connolly@linaro.org>
+  - Gaurav Kohli <gaurav.kohli@oss.qualcomm.com>
+
+description:
+  Qualcomm QMI-based TMD cooling devices are used to mitigate thermal conditions
+  across multiple remote subsystems. These devices operate based on junction temperature
+  sensors (TSENS) associated with thermal zones for each subsystem.
+
+  Each subnode corresponds to a control interface for a single instance of the TMD
+  service running on a remote subsystem.
+
+definitions:
+  tmd:
+    type: object
+    description: |
+      A single Thermal Mitigation Device exposed by a remote subsystem.
+    properties:
+      label:
+        maxItems: 1
+      "#cooling-cells":
+        $ref: /schemas/thermal/thermal-cooling-devices.yaml#/properties/#cooling-cells
+      phandle: true
+
+    required:
+      - label
+      - "#cooling-cells"
+
+    additionalProperties: false
+
+properties:
+  compatible:
+    enum:
+      - qcom,qmi-cooling-modem
+      - qcom,qmi-cooling-cdsp
+
+  vdd:
+    $ref: "#/definitions/tmd"
+    description:
+      Modem processor temperature TMD
+    properties:
+      label:
+        const: modem
+
+required:
+  - compatible
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: qcom,qmi-cooling-cdsp
+    then:
+      properties:
+        cdsp_sw:
+          $ref: "#/definitions/tmd"
+          description:
+            CDSP software TMD
+          properties:
+            label:
+              const: cdsp_sw
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    remoteproc-cdsp {
+        cooling {
+            compatible = "qcom,qmi-cooling-cdsp";
+
+            cdsp_sw0: cdsp_sw {
+              label = "cdsp_sw";
+              #cooling-cells = <2>;
+            };
+        };
+    };
+
+    remoteproc-cdsp1 {
+        cooling {
+            compatible = "qcom,qmi-cooling-cdsp1";
+
+            cdsp_sw1: cdsp_sw {
+              label = "cdsp_sw";
+              #cooling-cells = <2>;
+            };
+        };
+    };
+...

MAINTAINERS

@@ -25924,6 +25924,14 @@ F:	drivers/thermal/cpufreq_cooling.c
 F:	drivers/thermal/cpuidle_cooling.c
 F:	include/linux/cpu_cooling.h
 
+THERMAL/REMOTEPROC_COOLING
+M:	Gaurav Kohli <gaurav.kohli@oss.qualcomm.com>
+L:	linux-pm@vger.kernel.org
+S:	Supported
+F:	drivers/thermal/remoteproc_cooling.c
+F:	include/linux/remoteproc_cooling.h
+
+
 THERMAL/POWER_ALLOCATOR
 M:	Lukasz Luba <lukasz.luba@arm.com>
 L:	linux-pm@vger.kernel.org

drivers/soc/qcom/Kconfig

@@ -124,6 +124,19 @@ config QCOM_PMIC_GLINK
 	  Say yes here to support USB-C and battery status on modern Qualcomm
 	  platforms.
 
+config QCOM_QMI_COOLING
+	tristate "Qualcomm QMI cooling drivers"
+	depends on QCOM_RPROC_COMMON
+	depends on ARCH_QCOM || COMPILE_TEST
+	select QCOM_QMI_HELPERS
+	help
+	   This enables the remote subsystem cooling devices. These cooling
+	   devices will be used by Qualcomm chipset to place various remote
+	   subsystem mitigations like remote processor passive mitigation,
+	   remote subsystem voltage restriction at low temperatures etc.
+	   The QMI cooling device will interface with remote subsystem
+	   using Qualcomm remoteproc interface.
+
 config QCOM_QMI_HELPERS
 	tristate
 	depends on NET

drivers/soc/qcom/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_QCOM_PMIC_GLINK)	+= pmic_glink.o
 obj-$(CONFIG_QCOM_PMIC_GLINK)	+= pmic_glink_altmode.o
 obj-$(CONFIG_QCOM_PMIC_PDCHARGER_ULOG)	+= pmic_pdcharger_ulog.o
 CFLAGS_pmic_pdcharger_ulog.o	:=  -I$(src)
+obj-$(CONFIG_QCOM_QMI_COOLING) += qmi-cooling.o
 obj-$(CONFIG_QCOM_QMI_HELPERS)	+= qmi_helpers.o
 qmi_helpers-y	+= qmi_encdec.o qmi_interface.o
 obj-$(CONFIG_QCOM_RAMP_CTRL)	+= ramp_controller.o