From: arno@natisbad•org (Arnaud Ebalard)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCHv1 2/3] arm: mvebu: add .dts file for Synology DS213j
Date: Mon, 17 Nov 2014 09:25:15 +0100 [thread overview]
Message-ID: <878ujas07o.fsf@natisbad.org> (raw)
In-Reply-To: <546931E1.5070909@killerwolves.net> (Ben Peddell's message of "Mon, 17 Nov 2014 09:23:13 +1000")
Hi,
Ben Peddell <klightspeed@killerwolves•net> writes:
> On 16/11/2014 11:14 PM, Arnaud Ebalard wrote:
>>>> + gpio-fan-100-32-35 {
>>> There is some logic to this naming, but i don't remember what it is.
>>> Did you check this is appropriate?
>> The 32-35 is for the MPP i.e. fan uses mpp32 to mpp35 (3 MPP for speed,
>> one for alarm). I don't know what the 100 part means. What I did is I
>> googled to see which fan supported kirkwood models have and noticed
>> that the DS212j uses the exact same fan, i.e. Y.S.Tech FD129225LL-N so
>> I opted for the same naming.
>>
>> On that aspect, you may be able to explain why the speed-map for this
>> fan goes up to 5000 RPM. This fan is supposed to operate at 1900RPM.
>> Note that it does not matter in practice.
>
> On the Kirkwood Diskstations, the first number (100, 120 or 150) refers
> to the middle of the three fan speed resistors,
Would not have found that alone ;-) Thanks for clarifying.
> the second number (15 or
> 32) refers to the first fan control pin, and the third number (18 or 35)
> refers to the first fan alarm pin.
>
> i.e. the 100-32-35 uses fan speed resistors of 33, 100 and 150 ohms,
> uses pins 32-34 for fan control, and uses pin 35 for the fan alarm.
>
> The 5000RPM was interpolated from my measured RPM pulse rate (4200PPM)
> of the 80mm fan in my DS211j (which uses the 150-32-35 fan config) at
> maximum RPM.
Then, I think I need to change the speed map to have 1900 RPM as max
speed. Out of curiosity, how did you measured the RPM pulse rate
exactly?
Cheers,
a+
next prev parent reply other threads:[~2014-11-17 8:25 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-16 0:04 [PATCHv1 0/3] arm: mvebu: add Synology DS213j and DS414 .dts files Arnaud Ebalard
2014-11-16 0:04 ` [PATCHv1 1/3] arm: mvebu: add uartX labels for Armada SoC serial nodes Arnaud Ebalard
2014-11-16 1:09 ` Andrew Lunn
2014-11-16 12:34 ` Arnaud Ebalard
2014-11-16 0:04 ` [PATCHv1 2/3] arm: mvebu: add .dts file for Synology DS213j Arnaud Ebalard
2014-11-16 2:00 ` Andrew Lunn
2014-11-16 2:31 ` Andrew Lunn
2014-11-16 13:14 ` Arnaud Ebalard
2014-11-16 23:23 ` Ben Peddell
2014-11-17 8:25 ` Arnaud Ebalard [this message]
2014-11-17 22:41 ` Ben Peddell
2014-11-17 23:23 ` Arnaud Ebalard
2014-11-16 0:04 ` [PATCHv1 3/3] arm: mvebu: add .dts file for Synology DS414 Arnaud Ebalard
2014-11-16 2:15 ` Andrew Lunn
2014-11-16 13:17 ` Arnaud Ebalard
2014-11-16 2:20 ` [PATCHv1 0/3] arm: mvebu: add Synology DS213j and DS414 .dts files Andrew Lunn
2014-11-16 13:24 ` Arnaud Ebalard
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