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Thu, 8 Oct 2026 07:20:11 +0000 From: Changhuang Liang To: Guenter Roeck , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, Changhuang Liang Subject: [PATCH v6 1/2] dt-bindings: hwmon: Add starfive,jhb100-pwm-fan Date: Thu, 8 Oct 2026 00:19:49 -0700 Message-Id: <20261008071950.4772-2-changhuang.liang@starfivetech.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20261008071950.4772-1-changhuang.liang@starfivetech.com> References: <20261008071950.4772-1-changhuang.liang@starfivetech.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SH0PR01CA0018.CHNPR01.prod.partner.outlook.cn (2406:e500:c311:5::30) To ZQ4PR01MB1202.CHNPR01.prod.partner.outlook.cn (2406:e500:c550:17::6) Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: ZQ4PR01MB1202:EE_|ZQ4PR01MB1220:EE_ X-MS-Office365-Filtering-Correlation-Id: 7ce968c7-b018-486f-5f38-08df250c96cb X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|52116014|23010399003|38350700014|56012099006|10067099003|22082099003|18002099003|3023799007; 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The controller has a hardware tachometer block with 16 tachometer inputs, while fan speed is controlled through 8 PWM channels supplied by an external PWM controller. One PWM channel can drive up to two fans, so each fan-N child node references one PWM channel and lists the tachometer inputs wired to the fans it drives. Signed-off-by: Changhuang Liang Reviewed-by: Conor Dooley --- .../hwmon/starfive,jhb100-pwm-fan.yaml | 87 +++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/starfive,jhb100-pwm-fan.yaml diff --git a/Documentation/devicetree/bindings/hwmon/starfive,jhb100-pwm-fan.yaml b/Documentation/devicetree/bindings/hwmon/starfive,jhb100-pwm-fan.yaml new file mode 100644 index 000000000000..b05789867c0e --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/starfive,jhb100-pwm-fan.yaml @@ -0,0 +1,87 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/starfive,jhb100-pwm-fan.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: StarFive JHB100 PWM Fan Controller + +maintainers: + - Changhuang Liang + +description: + The StarFive JHB100 fan controller uses a hardware tachometer block with + 16 tachometer inputs to measure fan speed. Fan speed is controlled through + 8 PWM channels supplied by an external PWM controller, and one PWM channel + can drive up to two fans. Each fan child node references the PWM channel + driving the fan(s) and lists the tachometer inputs wired to them. + +properties: + compatible: + const: starfive,jhb100-pwm-fan + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + resets: + maxItems: 1 + + interrupts: + maxItems: 1 + +patternProperties: + "^fan-[0-7]$": + $ref: fan-common.yaml# + unevaluatedProperties: false + + properties: + pulses-per-revolution: + minimum: 1 + default: 2 + + tach-ch: + description: + The tachometer input(s) wired to the fan(s) driven by the PWM + channel. One PWM channel can drive up to two fans. + minItems: 1 + maxItems: 2 + items: + maximum: 15 + + required: + - pwms + - tach-ch + +required: + - compatible + - reg + - clocks + - resets + - interrupts + +additionalProperties: false + +examples: + - | + fan-controller@11be0000 { + compatible = "starfive,jhb100-pwm-fan"; + reg = <0x11be0000 0x400>; + interrupts = <128>; + clocks = <&per2crg 33>; + resets = <&per2crg 5>; + + fan-0 { + pwms = <&pwm0 0 40000 0>; + tach-ch = /bits/ 8 <0x0 0x8>; + pulses-per-revolution = <2>; + }; + + fan-1 { + pwms = <&pwm1 0 40000 0>; + tach-ch = /bits/ 8 <0x1 0x9>; + }; + }; +... -- 2.25.1