linux-kernel - [PATCH 1/4] dt-bindings: thermal: k3: Add VTM bindings documentation

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Date:   Thu, 13 Feb 2020 15:54:37 +0530
From:   Keerthy <j-keerthy@...com>
To:     <rui.zhang@...el.com>, <robh+dt@...nel.org>,
        <daniel.lezcano@...aro.org>
CC:     <j-keerthy@...com>, <amit.kucheria@...durent.com>,
        <t-kristo@...com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <mark.rutland@....com>
Subject: [PATCH 1/4] dt-bindings: thermal: k3: Add VTM bindings documentation

Add VTM bindings documentation. In the Voltage Thermal
Management Module(VTM), K3 AM654 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>
---
 .../bindings/thermal/ti,am654-thermal.yaml    | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml

diff --git a/Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml b/Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml
new file mode 100644
index 000000000000..bb2e8d7000e5
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml
@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+Copyright 2020 Texas Instruments Incorporated
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/ti,am654-thermal.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STexas Instruments VTM (DTS) binding
+
+maintainers:
+  - Keerthy <j-keerthy@...com>
+
+properties:
+  compatible:
+    const: ti,am654-vtm
+
+  reg:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+    description: phandle to the associated power domain
+
+  "#thermal-sensor-cells":
+    const: 1
+
+required:
+  - "#thermal-sensor-cells"
+  - compatible
+  - reg
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
+    wkup_vtm0: wkup_vtm0@...50000 {
+        compatible = "ti,am654-vtm";
+        reg = <0x0 0x42050000 0x0 0x25c>;
+        power-domains = <&k3_pds 80 TI_SCI_PD_EXCLUSIVE>;
+        #thermal-sensor-cells = <1>;
+    };
+
+
+    mpu0_thermal: mpu0_thermal {
+	polling-delay-passive = <250>; /* milliseconds */
+	polling-delay = <500>; /* milliseconds */
+	thermal-sensors = <&wkup_vtm0 0>;
+
+	trips {
+		mpu0_crit: mpu0_crit {
+			temperature = <125000>; /* milliCelsius */
+			hysteresis = <2000>; /* milliCelsius */
+			type = "critical";
+		};
+	};
+    };
+...
-- 
2.17.1