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Message-ID: <13b195e6-cbbd-4f74-a6fa-d874cb4aaa45@linaro.org>
Date: Sun, 14 Apr 2024 08:07:09 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Chanh Nguyen <chanh@...amperecomputing.com>,
Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, Justin Ledford
<justinledford@...gle.com>, devicetree@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
Open Source Submission <patches@...erecomputing.com>
Cc: Phong Vo <phong@...amperecomputing.com>,
Thang Nguyen <thang@...amperecomputing.com>,
Quan Nguyen <quan@...amperecomputing.com>
Subject: Re: [PATCH v2 3/3] dt-bindings: hwmon: max31790: Add
maxim,pwmout-pin-as-tach-input property
On 14/04/2024 06:22, Chanh Nguyen wrote:
> The max31790 supports six pins, which are dedicated PWM outputs. Any of the
> six PWM outputs can also be configured to serve as tachometer inputs,
> allowing for up to 12 tachometer fans to be monitored.
>
> Add a new vendor-specific property, 'maxim,pwmout-pin-as-tach-input',
> to allow PWMOUT to become a TACH input.
>
> An array of six integers responds to six PWM channels for configuring
> the PWM to TACH mode. When set to 0, the associated PWMOUT produces
> a PWM waveform for control of fan speed. When set to 1, PWMOUT becomes
> a TACH input.
>
> Signed-off-by: Chanh Nguyen <chanh@...amperecomputing.com>
> ---
> Changes in v2:
> - Update the vendor property name to "maxim,pwmout-pin-as-tach-input" [Rob]
> - Update commit message [Krzysztof]
Please put binding before its user.
> ---
> .../devicetree/bindings/hwmon/maxim,max31790.yaml | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml b/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml
> index a561e5a3e9e4..2d4f50bc7c41 100644
> --- a/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml
> +++ b/Documentation/devicetree/bindings/hwmon/maxim,max31790.yaml
> @@ -30,6 +30,16 @@ properties:
> resets:
> maxItems: 1
>
> + maxim,pwmout-pin-as-tach-input:
> + description: |
> + An array of six integers responds to six PWM channels for
> + configuring the pwm to tach mode.
> + When set to 0, the associated PWMOUT produces a PWM waveform for
> + control of fan speed. When set to 1, PWMOUT becomes a TACH input
> + $ref: /schemas/types.yaml#/definitions/uint8-array
> + maxItems: 6
> + minItems: 6
tach-ch solves your case. You define which inputs should be used for tach.
Best regards,
Krzysztof
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