We add binding for supporting a new AST2600 PWM/Fan hwmon driver. Changes since v1: - dt binding with DT schema format Signed-off-by: Troy Lee <troy_lee@xxxxxxxxxxxxxx> --- .../hwmon/aspeed,ast2600-pwm-tachometer.yaml | 137 ++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed,ast2600-pwm-tachometer.yaml diff --git a/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-pwm-tachometer.yaml b/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-pwm-tachometer.yaml new file mode 100644 index 000000000000..b84076a4a338 --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/aspeed,ast2600-pwm-tachometer.yaml @@ -0,0 +1,137 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- + +$id: http://devicetree.org/schemas/hwmon/aspeed,ast2600-pwm-tachometer.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ASPEED AST2600 PWM and Fan Tacho controller device driver + +maintainers: + - Ryan Chen <ryan_chen@xxxxxxxxxxxxxx> + +description: | + The ASPEED PWM controller can support upto 16 PWM outputs. The ASPEED Fan Tacho + controller can support upto 16 Fan tachometer inputs. + There can be upto 16 fans supported. Each fan can have one PWM output and + one Fan tach inputs. + +properties: + compatible: + const: aspeed,ast2600-pwm-tachometer + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + + "#cooling-cells": + const: 2 + + reg: + description: + Address and length of the register set for the device. + + clocks: + description: + phandle to clock provider with the clock number in the second cell + + resets: + description: + phandle to reset controller with the reset number in the second cell + +patternProperties: + "@[0-9]+$": + type: object + description: + Under fan subnode there can upto 16 child nodes, with each child node + representing a fan. There are 16 fans each fan can have one PWM port and one + Fan tach inputs. + For PWM port can be configured cooling-levels to create cooling device. + Cooling device could be bound to a thermal zone for the thermal control. + + properties: + reg: + minimum: 0 + maximum: 15 + description: + This property identify the PWM control channel of this fan. + + fan-tach-ch: + $ref: /schemas/types.yaml#/definitions/uint8 + minimum: 0 + maximum: 15 + description: + This property identify the fan tach input channel. + + pulses-per-revolution: + $ref: /schemas/types.yaml#/definitions/uint32 + default: 2 + minimum: 1 + description: + Specify tacho pulse per revolution of the fan. + + cooling-levels: + description: + PWM duty cycle values in a range from 0 to 255 + which correspond to thermal cooling states. + + aspeed,pwm-freq: + $ref: /schemas/types.yaml#/definitions/uint32 + default: 25000 + minimum: 24 + maximum: 780000 + description: + Specify the frequency of PWM. + + aspeed,inverse-pin: + type: boolean + description: + Inverse PWM output signal. + + aspeed,falling-point: + $ref: /schemas/types.yaml#/definitions/uint8 + default: 10 + minimum: 0 + maximum: 255 + description: + Initialize the pulse width. + + required: + - fan-tach-ch + - reg + + additionalProperties: true + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + pwm_tacho: pwm-tacho-controller@1e610000 { + compatible = "aspeed,ast2600-pwm-tachometer"; + #address-cells = <1>; + #size-cells = <0>; + reg = <0x1e610000 0x100>; + + fan@1 { + reg = <0x00>; + aspeed,pwm-freq = <25000>; + cooling-levels = /bits/ 8 <125 151 177 203 229 255>; + fan-tach-ch = /bits/ 8 <0x00>; + pulses-per-revolution = <2>; + }; + + fan@2 { + reg = <0x01>; + aspeed,pwm-freq = <25000>; + cooling-levels = /bits/ 8 <125 151 177 203 229 255>; + fan-tach-ch = /bits/ 8 <0x01>; + pulses-per-revolution = <2>; + }; + }; +... -- 2.25.1
