public inbox for devicetree@vger.kernel.org
 help / color / mirror / Atom feed
* [PATCH v1] dt-bindings: hwmon: convert npcm750-pwm-fan to DT schema
@ 2026-02-10 15:41 Tomer Maimon
  2026-02-11 21:40 ` Rob Herring
  0 siblings, 1 reply; 2+ messages in thread
From: Tomer Maimon @ 2026-02-10 15:41 UTC (permalink / raw)
  To: andrew, avifishman70, tali.perry1, linux, robh, krzk+dt, conor+dt
  Cc: venture, yuenn, benjaminfair, openbmc, linux-hwmon, devicetree,
	linux-kernel, Tomer Maimon

Convert the Nuvoton HWMON PWM and FAN controllers binding to schema
format.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 .../bindings/hwmon/npcm750-pwm-fan.txt        |  88 ------------
 .../bindings/hwmon/npcm750-pwm-fan.yaml       | 132 ++++++++++++++++++
 2 files changed, 132 insertions(+), 88 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.txt
 create mode 100644 Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.txt
deleted file mode 100644
index 18095ba87a5a..000000000000
--- a/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.txt
+++ /dev/null
@@ -1,88 +0,0 @@
-Nuvoton NPCM PWM and Fan Tacho controller device
-
-The Nuvoton BMC NPCM7XX supports 8 Pulse-width modulation (PWM)
-controller outputs and 16 Fan tachometer controller inputs.
-
-The Nuvoton BMC NPCM8XX supports 12 Pulse-width modulation (PWM)
-controller outputs and 16 Fan tachometer controller inputs.
-
-Required properties for pwm-fan node
-- #address-cells : should be 1.
-- #size-cells	: should be 0.
-- compatible	: "nuvoton,npcm750-pwm-fan" for Poleg NPCM7XX.
-				: "nuvoton,npcm845-pwm-fan" for Arbel NPCM8XX.
-- reg			: specifies physical base address and size of the registers.
-- reg-names	: must contain:
-					* "pwm" for the PWM registers.
-					* "fan" for the Fan registers.
-- clocks		: phandle of reference clocks.
-- clock-names	: must contain
-					* "pwm" for PWM controller operating clock.
-					* "fan" for Fan controller operating clock.
-- interrupts	: contain the Fan interrupts with flags for falling edge.
-- pinctrl-names	: a pinctrl state named "default" must be defined.
-- pinctrl-0	: phandle referencing pin configuration of the PWM and Fan
-					controller ports.
-
-fan subnode format:
-===================
-Under fan subnode can be upto 8 child nodes, each child node representing a fan.
-Each fan subnode must have one PWM channel and at least one Fan tach channel.
-
-For PWM channel can be configured cooling-levels to create cooling device.
-Cooling device could be bound to a thermal zone for the thermal control.
-
-Required properties for each child node:
-- reg : specify the PWM output channel.
-	integer value in the range 0 through 7, that represent
-	the PWM channel number that used.
-
-- fan-tach-ch : specify the Fan tach input channel.
-		integer value in the range 0 through 15, that represent
-		the fan tach channel number that used.
-
-		At least one Fan tach input channel is required
-
-Optional property for each child node:
-- cooling-levels: PWM duty cycle values in a range from 0 to 255
-                  which correspond to thermal cooling states.
-
-Examples:
-
-pwm_fan:pwm-fan-controller@103000 {
-	#address-cells = <1>;
-	#size-cells = <0>;
-	compatible = "nuvoton,npcm750-pwm-fan";
-	reg = <0x103000 0x2000>,
-		<0x180000 0x8000>;
-	reg-names = "pwm", "fan";
-	clocks = <&clk NPCM7XX_CLK_APB3>,
-		<&clk NPCM7XX_CLK_APB4>;
-	clock-names = "pwm","fan";
-	interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
-			<GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
-			<GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
-			<GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
-			<GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
-			<GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
-			<GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
-			<GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
-	pinctrl-names = "default";
-	pinctrl-0 = <&pwm0_pins &pwm1_pins &pwm2_pins
-			&fanin0_pins &fanin1_pins &fanin2_pins
-			&fanin3_pins &fanin4_pins>;
-	fan@0 {
-		reg = <0x00>;
-		fan-tach-ch = /bits/ 8 <0x00 0x01>;
-		cooling-levels = <127 255>;
-	};
-	fan@1 {
-		reg = <0x01>;
-		fan-tach-ch = /bits/ 8 <0x02 0x03>;
-	};
-	fan@2 {
-		reg = <0x02>;
-		fan-tach-ch = /bits/ 8 <0x04>;
-	};
-
-};
diff --git a/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.yaml b/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.yaml
new file mode 100644
index 000000000000..954ba7d38b93
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/npcm750-pwm-fan.yaml
@@ -0,0 +1,132 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hwmon/npcm750-pwm-fan.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton NPCM7xx/NPCM8xx PWM and Fan Tach Controller
+
+maintainers:
+  - Tomer Maimon <tmaimon77@gmail.com>
+
+description: |
+  The NPCM7xx/NPCM8xx family includes a PWM and Fan Tachometer controller.
+  The controller provides up to 8 (NPCM7xx) or 12 (NPCM8xx) PWM channels and up
+  to 16 tachometer inputs. It is used for fan speed control and monitoring.
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,npcm750-pwm-fan
+      - nuvoton,npcm845-pwm-fan
+
+  reg:
+    maxItems: 2
+    description: Register addresses for PWM and Fan Tach units.
+
+  reg-names:
+    items:
+      - const: pwm
+      - const: fan
+
+  clocks:
+    maxItems: 2
+    description: Clocks for the PWM and Fan Tach modules.
+
+  clock-names:
+    items:
+      - const: pwm
+      - const: fan
+
+  interrupts:
+    description: |
+      Contains the Fan interrupts with flags for falling edge.
+      For NPCM7XX, 8 interrupt lines are expected (one per PWM channel).
+      For NPCM8XX, 12 interrupt lines are expected (one per PWM channel).
+    minItems: 8
+    maxItems: 12
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^fan@[0-9a-f]+$":
+    type: object
+    $ref: fan-common.yaml#
+    unevaluatedProperties: false
+
+    properties:
+      reg:
+        maxItems: 1
+        description: |
+          Specify the PWM output channel. Integer value in the range 0-7 for
+          NPCM7XX or 0-11 for NPCM8XX, representing the PWM channel number.
+
+      fan-tach-ch:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        description: |
+          The tach channel(s) used for the fan.
+          Integer values in the range 0-15.
+
+      cooling-levels:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        description: |
+          PWM duty cycle values in a range from 0 to 255 which
+          correspond to thermal cooling states. This property enables
+          thermal zone integration for automatic fan speed control
+          based on temperature.
+
+    required:
+      - reg
+      - fan-tach-ch
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - clocks
+  - clock-names
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/nuvoton,npcm7xx-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    pwm_fan: pwm-fan@103000 {
+        compatible = "nuvoton,npcm750-pwm-fan";
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        reg = <0x103000 0x2000>, <0x180000 0x8000>;
+        reg-names = "pwm", "fan";
+
+        clocks = <&clk NPCM7XX_CLK_APB3>, <&clk NPCM7XX_CLK_APB4>;
+        clock-names = "pwm", "fan";
+
+        interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&pwm0_pins &fanin0_pins>;
+
+        fan@0 {
+            reg = <0>;
+            fan-tach-ch = <0 1>;
+            cooling-levels = <64 128 192 255>;
+        };
+
+        fan@1 {
+            reg = <1>;
+            fan-tach-ch = <2>;
+        };
+    };
-- 
2.34.1


^ permalink raw reply related	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2026-02-11 21:40 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-02-10 15:41 [PATCH v1] dt-bindings: hwmon: convert npcm750-pwm-fan to DT schema Tomer Maimon
2026-02-11 21:40 ` Rob Herring

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox