From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Wahren Subject: [PATCH RFC 1/2] dt-bindings: hwmon: Add RPi PoE HAT documentation Date: Sun, 2 Sep 2018 13:20:50 +0200 Message-ID: <1535887251-29515-2-git-send-email-stefan.wahren@i2se.com> References: <1535887251-29515-1-git-send-email-stefan.wahren@i2se.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1535887251-29515-1-git-send-email-stefan.wahren@i2se.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Jean Delvare , Guenter Roeck , Rob Herring , Mark Rutland Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, Florian Fainelli , Serge Schneider , Stefan Wahren , Phil Elwell , linux-kernel@vger.kernel.org, Eric Anholt , bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org From: Serge Schneider This patch adds the binding for the fan on the Raspberry Pi Power over Ethernet HAT. Signed-off-by: Serge Schneider Signed-off-by: Stefan Wahren --- .../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