From: Guenter Roeck <linux@roeck-us.net>
To: Zev Weiss <zev@bewilderbeest.net>, baneric926@gmail.com
Cc: jdelvare@suse.com, robh+dt@kernel.org,
krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
corbet@lwn.net, linux-hwmon@vger.kernel.org,
devicetree@vger.kernel.org, kcfeng0@nuvoton.com,
kwliu@nuvoton.com, openbmc@lists.ozlabs.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
DELPHINE_CHIU@wiwynn.com, naresh.solanki@9elements.com,
billy_tsai@aspeedtech.com, Rob Herring <robh@kernel.org>
Subject: Re: [PATCH v4 1/3] dt-bindings: hwmon: fan: Add fan binding to schema
Date: Mon, 4 Mar 2024 16:49:27 -0800 [thread overview]
Message-ID: <03b6a094-b76d-4b4f-90d8-8b00219ec236@roeck-us.net> (raw)
In-Reply-To: <e590e3ba-f446-4f20-9618-d4ff388586ad@roeck-us.net>
On 3/4/24 16:41, Guenter Roeck wrote:
>>> +
>>> + min-rpm:
>>> + description:
>>> + Min RPM supported by fan.
>>> + $ref: /schemas/types.yaml#/definitions/uint32
>>> + maximum: 1000
>>
>> I can't say with certainty that it's not, but are we sure 1000 is low enough? Looking at just what I've got on hand, an 80mm fan I have will run steadily at about 1500RPM, and I'd assume larger ones (e.g. 120mm) could potentially go significantly lower...
>>
>
> I have seen fans which run stable at < 400rpm.
> One of my systems right now has:
>
> fan1: 732 RPM (min = 0 RPM)
> fan2: 0 RPM (min = 0 RPM)
> fan3: 586 RPM (min = 0 RPM)
> fan4: 472 RPM (min = 0 RPM)
> fan5: 480 RPM (min = 0 RPM)
>
> Those are 80mm fans. A quick check shows that various Noctua fans have a
> minimum speed of 300 rpm. So 1000 is indeed a bit high for the minimum speed.
>
No, wait, that is the _maximum_ minimum speed. Got me there.
So, there is Noctua's NF-A4x20 PWM with a minimum rotational speed of 1,200 RPM.
If I interpret
https://www.mouser.com/datasheet/2/471/SanyoDenki_San_Ace_40LG28_E-3198440.pdf
correctly, it lists some fans with a minimum speed of 7,500 RPM.
Guenter
WARNING: multiple messages have this Message-ID (diff)
From: Guenter Roeck <linux@roeck-us.net>
To: Zev Weiss <zev@bewilderbeest.net>, baneric926@gmail.com
Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org,
conor+dt@kernel.org, jdelvare@suse.com, corbet@lwn.net,
openbmc@lists.ozlabs.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, DELPHINE_CHIU@wiwynn.com,
naresh.solanki@9elements.com, billy_tsai@aspeedtech.com,
kcfeng0@nuvoton.com, robh+dt@kernel.org,
krzysztof.kozlowski+dt@linaro.org, kwliu@nuvoton.com,
Rob Herring <robh@kernel.org>
Subject: Re: [PATCH v4 1/3] dt-bindings: hwmon: fan: Add fan binding to schema
Date: Mon, 4 Mar 2024 16:49:27 -0800 [thread overview]
Message-ID: <03b6a094-b76d-4b4f-90d8-8b00219ec236@roeck-us.net> (raw)
In-Reply-To: <e590e3ba-f446-4f20-9618-d4ff388586ad@roeck-us.net>
On 3/4/24 16:41, Guenter Roeck wrote:
>>> +
>>> + min-rpm:
>>> + description:
>>> + Min RPM supported by fan.
>>> + $ref: /schemas/types.yaml#/definitions/uint32
>>> + maximum: 1000
>>
>> I can't say with certainty that it's not, but are we sure 1000 is low enough? Looking at just what I've got on hand, an 80mm fan I have will run steadily at about 1500RPM, and I'd assume larger ones (e.g. 120mm) could potentially go significantly lower...
>>
>
> I have seen fans which run stable at < 400rpm.
> One of my systems right now has:
>
> fan1: 732 RPM (min = 0 RPM)
> fan2: 0 RPM (min = 0 RPM)
> fan3: 586 RPM (min = 0 RPM)
> fan4: 472 RPM (min = 0 RPM)
> fan5: 480 RPM (min = 0 RPM)
>
> Those are 80mm fans. A quick check shows that various Noctua fans have a
> minimum speed of 300 rpm. So 1000 is indeed a bit high for the minimum speed.
>
No, wait, that is the _maximum_ minimum speed. Got me there.
So, there is Noctua's NF-A4x20 PWM with a minimum rotational speed of 1,200 RPM.
If I interpret
https://www.mouser.com/datasheet/2/471/SanyoDenki_San_Ace_40LG28_E-3198440.pdf
correctly, it lists some fans with a minimum speed of 7,500 RPM.
Guenter
next prev parent reply other threads:[~2024-03-05 0:49 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-27 0:56 [PATCH v4 0/3] hwmon: Driver for Nuvoton NCT7363Y baneric926
2024-02-27 0:56 ` baneric926
2024-02-27 0:56 ` [PATCH v4 1/3] dt-bindings: hwmon: fan: Add fan binding to schema baneric926
2024-02-27 0:56 ` baneric926
2024-03-05 0:22 ` Zev Weiss
2024-03-05 0:22 ` Zev Weiss
2024-03-05 0:41 ` Guenter Roeck
2024-03-05 0:41 ` Guenter Roeck
2024-03-05 0:49 ` Guenter Roeck [this message]
2024-03-05 0:49 ` Guenter Roeck
2024-03-07 7:41 ` Ban Feng
2024-03-07 7:41 ` Ban Feng
2024-03-07 18:53 ` Guenter Roeck
2024-03-07 18:53 ` Guenter Roeck
2024-03-18 0:58 ` Ban Feng
2024-03-18 0:58 ` Ban Feng
2024-02-27 0:56 ` [PATCH v4 2/3] dt-bindings: hwmon: Add NCT7363Y documentation baneric926
2024-02-27 0:56 ` baneric926
2024-02-28 7:30 ` Paul Menzel
2024-02-28 7:30 ` Paul Menzel
2024-03-06 7:56 ` Ban Feng
2024-03-06 7:56 ` Ban Feng
2024-02-27 0:56 ` [PATCH v4 3/3] hwmon: Driver for Nuvoton NCT7363Y baneric926
2024-02-27 0:56 ` baneric926
2024-02-28 7:57 ` Paul Menzel
2024-02-28 7:57 ` Paul Menzel
2024-02-28 9:03 ` Guenter Roeck
2024-02-28 9:03 ` Guenter Roeck
2024-02-28 11:03 ` Paul Menzel
2024-02-28 11:03 ` Paul Menzel
2024-02-28 16:03 ` Guenter Roeck
2024-02-28 16:03 ` Guenter Roeck
2024-02-28 16:25 ` Commit messages (was: [PATCH v4 3/3] hwmon: Driver for Nuvoton NCT7363Y) Paul Menzel
2024-02-28 16:25 ` Paul Menzel
2024-03-07 0:58 ` Ban Feng
2024-03-07 0:58 ` Ban Feng
2024-03-07 0:55 ` [PATCH v4 3/3] hwmon: Driver for Nuvoton NCT7363Y Ban Feng
2024-03-07 0:55 ` Ban Feng
2024-03-02 8:18 ` Zev Weiss
2024-03-02 8:18 ` Zev Weiss
2024-03-05 0:28 ` Zev Weiss
2024-03-05 0:28 ` Zev Weiss
2024-03-07 7:36 ` Ban Feng
2024-03-07 7:36 ` Ban Feng
2024-03-07 7:35 ` Ban Feng
2024-03-07 7:35 ` Ban Feng
2024-03-12 23:18 ` Zev Weiss
2024-03-12 23:18 ` Zev Weiss
2024-03-12 23:58 ` Guenter Roeck
2024-03-12 23:58 ` Guenter Roeck
2024-03-13 0:21 ` Zev Weiss
2024-03-13 0:21 ` Zev Weiss
2024-03-18 1:02 ` Ban Feng
2024-03-18 1:02 ` Ban Feng
2024-03-19 0:35 ` Zev Weiss
2024-03-19 0:35 ` Zev Weiss
-- strict thread matches above, loose matches on Subject: below --
2022-10-13 9:48 [PATCH v4 0/3] Add devicetree support for max6639 Naresh Solanki
2022-10-13 9:48 ` [PATCH v4 1/3] dt-bindings: hwmon: fan: Add fan binding to schema Naresh Solanki
2022-10-24 16:18 ` Rob Herring
2022-10-25 9:16 ` Naresh Solanki
2022-10-26 13:37 ` Rob Herring
2022-10-31 8:05 ` Naresh Solanki
2022-11-01 18:44 ` Rob Herring
2022-11-01 19:22 ` Naresh Solanki
2022-11-11 21:07 ` Naresh Solanki
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