linux-kernel - [PATCH RFC 1/2] dt-bindings: hwmon: Add RPi PoE HAT documentation

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Message-Id: <1535887251-29515-2-git-send-email-stefan.wahren@i2se.com>
Date:   Sun,  2 Sep 2018 13:20:50 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Eric Anholt <eric@...olt.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Phil Elwell <phil@...pberrypi.org>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Serge Schneider <serge@...pberrypi.org>,
        Stefan Wahren <stefan.wahren@...e.com>
Subject: [PATCH RFC 1/2] dt-bindings: hwmon: Add RPi PoE HAT documentation

From: Serge Schneider <serge@...pberrypi.org>

This patch adds the binding for the fan on the Raspberry Pi Power over
Ethernet HAT.

Signed-off-by: Serge Schneider <serge@...pberrypi.org>
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
---
 .../devicetree/bindings/hwmon/rpi-poe-fan.txt      | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt

diff --git a/Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt b/Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
new file mode 100644
index 0000000..c71f856
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
@@ -0,0 +1,55 @@
+Bindings for the Raspberry Pi PoE HAT fan
+
+Required properties:
+- compatible	: "raspberrypi,rpi-poe-fan"
+- firmware	: Reference to the RPi firmware device node
+- pwms		: the PWM that is used to control the PWM fan
+- cooling-levels      : PWM duty cycle values in a range from 0 to 255
+			which correspond to thermal cooling states
+
+Example:
+	fan0: rpi-poe-fan@0 {
+		compatible = "raspberrypi,rpi-poe-fan";
+		firmware = <&firmware>;
+		cooling-min-state = <0>;
+		cooling-max-state = <3>;
+		#cooling-cells = <2>;
+		cooling-levels = <0 50 150 255>;
+		status = "okay";
+	};
+
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			trips {
+				threshold: trip-point@0 {
+					temperature = <45000>;
+					hysteresis = <5000>;
+					type = "active";
+				};
+				target: trip-point@1 {
+					temperature = <50000>;
+					hysteresis = <2000>;
+					type = "active";
+				};
+				cpu_hot: cpu_hot@0 {
+					temperature = <55000>;
+					hysteresis = <2000>;
+					type = "active";
+				};
+			};
+			cooling-maps {
+				map0 {
+					trip = <&threshold>;
+					cooling-device = <&fan0 0 1>;
+				};
+				map1 {
+					trip = <&target>;
+					cooling-device = <&fan0 1 2>;
+				};
+				map2 {
+					trip = <&cpu_hot>;
+					cooling-device = <&fan0 2 3>;
+				};
+			};
+		};
+	};
-- 
2.7.4