linux-kernel - [PATCH v9 1/2] dt-bindings: thermal: k3-j72xx: Add VTM bindings documentation

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Message-ID: <20220517172920.10857-2-j-keerthy@ti.com>
Date:   Tue, 17 May 2022 22:59:19 +0530
From:   Keerthy <j-keerthy@...com>
To:     <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <daniel.lezcano@...aro.org>, <rui.zhang@...el.com>,
        <amitk@...nel.org>, <kristo@...nel.org>
CC:     <j-keerthy@...com>, <rafael@...nel.org>,
        <linux-pm@...r.kernel.org>, <vigneshr@...com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v9 1/2] dt-bindings: thermal: k3-j72xx: Add VTM bindings documentation

Add VTM bindings documentation. In the Voltage Thermal
Management Module(VTM), K3 J72XX supplies a voltage
reference and a temperature sensor feature that are gathered in the band
gap voltage and temperature sensor (VBGAPTS) module. The band
gap provides current and voltage reference for its internal
circuits and other analog IP blocks. The analog-to-digital
converter (ADC) produces an output value that is proportional
to the silicon temperature.

Signed-off-by: Keerthy <j-keerthy@...com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
 .../bindings/thermal/ti,j72xx-thermal.yaml    | 63 +++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml

diff --git a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
new file mode 100644
index 000000000000..c74f124ebfc0
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/ti,j72xx-thermal.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments J72XX VTM (DTS) binding
+
+maintainers:
+  - Keerthy <j-keerthy@...com>
+
+properties:
+  compatible:
+    enum:
+      - ti,j721e-vtm
+      - ti,j7200-vtm
+
+  reg:
+    items:
+      - description: VTM cfg1 register space
+      - description: VTM cfg2 register space
+      - description: VTM efuse register space
+
+  power-domains:
+    maxItems: 1
+
+  "#thermal-sensor-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - power-domains
+  - "#thermal-sensor-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
+    wkup_vtm0: thermal-sensor@...40000 {
+        compatible = "ti,j721e-vtm";
+        reg = <0x42040000 0x350>,
+              <0x42050000 0x350>,
+              <0x43000300 0x10>;
+        power-domains = <&k3_pds 154 TI_SCI_PD_EXCLUSIVE>;
+        #thermal-sensor-cells = <1>;
+    };
+
+    mpu_thermal: mpu-thermal {
+        polling-delay-passive = <250>; /* milliseconds */
+        polling-delay = <500>; /* milliseconds */
+        thermal-sensors = <&wkup_vtm0 0>;
+
+        trips {
+            mpu_crit: mpu-crit {
+                temperature = <125000>; /* milliCelsius */
+                hysteresis = <2000>; /* milliCelsius */
+                type = "critical";
+            };
+        };
+    };
+...
-- 
2.17.1