linux-kernel - Re: [PATCH v2 1/2] dt-bindings: hwmon: amc6821: add PWM polarity

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Message-ID: <20250226134922.GA1944823-robh@kernel.org>
Date: Wed, 26 Feb 2025 07:49:22 -0600
From: Rob Herring <robh@...nel.org>
To: Francesco Dolcini <francesco@...cini.it>
Cc: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Farouk Bouabid <farouk.bouabid@...rry.de>,
	Quentin Schulz <quentin.schulz@...rry.de>,
	Francesco Dolcini <francesco.dolcini@...adex.com>,
	linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: hwmon: amc6821: add PWM polarity

On Mon, Feb 24, 2025 at 07:08:00PM +0100, Francesco Dolcini wrote:
> From: Francesco Dolcini <francesco.dolcini@...adex.com>
> 
> Add property to describe the PWM-Out pin polarity.

Why doesn't the invert support in the pwm binding work for you? Yes, I 
read the discussion, but don't remember the conclusion and you need to 
justify it here.

> 
> Link: https://www.ti.com/lit/gpn/amc6821
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
> ---
> v2: no changes
> v1: https://lore.kernel.org/all/20250218165633.106867-2-francesco@dolcini.it/
> ---
>  Documentation/devicetree/bindings/hwmon/ti,amc6821.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/ti,amc6821.yaml b/Documentation/devicetree/bindings/hwmon/ti,amc6821.yaml
> index 5d33f1a23d03..11604aa41b3e 100644
> --- a/Documentation/devicetree/bindings/hwmon/ti,amc6821.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/ti,amc6821.yaml
> @@ -28,6 +28,14 @@ properties:
>    i2c-mux:
>      type: object
>  
> +  ti,pwm-inverted:
> +    type: boolean
> +    description:
> +      Set to make the PWM-Out pin go high (with an external pull-up resistor)
> +      for 100% duty cycle (suitable for driving the fan using a NMOS device),
> +      when not set the PWM-Out pin goes low for 100% duty cycle (suitable for
> +      driving the fan using a PMOS device).
> +
>  required:
>    - compatible
>    - reg
> -- 
> 2.39.5
>