From: Prashant Gaikwad <pgaikwad@nvidia.com>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: Device tree binding for DVFS table
Date: Thu, 12 Jul 2012 04:29:42 +0000 [thread overview]
Message-ID: <4FFE4FE6.20109@nvidia.com> (raw)
In-Reply-To: <20120711144449.GA23654@sirena.org.uk>
On Wednesday 11 July 2012 08:14 PM, Mark Brown wrote:
> On Wed, Jul 11, 2012 at 09:03:41AM -0500, Rob Herring wrote:
>
>> I'd expect a single property with freq/volt pairs or 2 properties for
>> freq and voltage where there is a 1:1 relationship (freq N uses voltage N).
> I strongly agree - the current proposal is very hard to read due to the
> separation between the voltage and frequency values. Some devices do
> also need to scale multiple rails together, especially when this gets
> used for I/O devices.
Multiple rails for single clock or would it be multiple clocks?
> I'd also expect to see a range of voltages for each frequency rather
> than a specific voltage; usually things are at least characterised with
> a specified tolerance.
But then how will you determine the operating voltage for a frequency?
WARNING: multiple messages have this Message-ID (diff)
From: pgaikwad@nvidia.com (Prashant Gaikwad)
To: linux-arm-kernel@lists.infradead.org
Subject: Device tree binding for DVFS table
Date: Thu, 12 Jul 2012 09:47:42 +0530 [thread overview]
Message-ID: <4FFE4FE6.20109@nvidia.com> (raw)
In-Reply-To: <20120711144449.GA23654@sirena.org.uk>
On Wednesday 11 July 2012 08:14 PM, Mark Brown wrote:
> On Wed, Jul 11, 2012 at 09:03:41AM -0500, Rob Herring wrote:
>
>> I'd expect a single property with freq/volt pairs or 2 properties for
>> freq and voltage where there is a 1:1 relationship (freq N uses voltage N).
> I strongly agree - the current proposal is very hard to read due to the
> separation between the voltage and frequency values. Some devices do
> also need to scale multiple rails together, especially when this gets
> used for I/O devices.
Multiple rails for single clock or would it be multiple clocks?
> I'd also expect to see a range of voltages for each frequency rather
> than a specific voltage; usually things are at least characterised with
> a specified tolerance.
But then how will you determine the operating voltage for a frequency?
next prev parent reply other threads:[~2012-07-12 4:29 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-11 12:56 Device tree binding for DVFS table Prashant Gaikwad
2012-07-11 13:08 ` Prashant Gaikwad
2012-07-11 14:03 ` Rob Herring
2012-07-11 14:03 ` Rob Herring
2012-07-11 14:44 ` Mark Brown
2012-07-11 14:44 ` Mark Brown
2012-07-11 20:04 ` Mike Turquette
2012-07-11 20:04 ` Mike Turquette
2012-07-12 4:14 ` Prashant Gaikwad
2012-07-12 4:26 ` Prashant Gaikwad
2012-07-12 14:10 ` Peter De Schrijver
2012-07-12 14:10 ` Peter De Schrijver
2012-07-12 17:10 ` Mike Turquette
2012-07-12 17:10 ` Mike Turquette
2012-07-12 17:15 ` Mark Brown
2012-07-12 17:15 ` Mark Brown
2012-07-13 10:34 ` Peter De Schrijver
2012-07-13 10:34 ` Peter De Schrijver
2012-07-13 17:25 ` Mike Turquette
2012-07-13 17:25 ` Mike Turquette
2012-07-12 4:17 ` Prashant Gaikwad [this message]
2012-07-12 4:29 ` Prashant Gaikwad
2012-07-12 15:23 ` Mark Brown
2012-07-12 15:23 ` Mark Brown
2012-07-12 17:01 ` Mike Turquette
2012-07-12 17:01 ` Mike Turquette
2012-07-12 8:19 ` Peter De Schrijver
2012-07-12 8:19 ` Peter De Schrijver
2012-07-12 4:08 ` Prashant Gaikwad
2012-07-12 4:20 ` Prashant Gaikwad
2012-07-13 18:30 ` Prashant Gaikwad
2012-07-13 18:42 ` Prashant Gaikwad
2012-07-15 21:40 ` Mark Brown
2012-07-15 21:40 ` Mark Brown
2012-07-15 23:42 ` Rob Herring
2012-07-15 23:42 ` Rob Herring
2012-07-16 18:36 ` Turquette, Mike
2012-07-16 18:36 ` Turquette, Mike
2012-07-17 12:37 ` Prashant Gaikwad
2012-07-17 12:49 ` Prashant Gaikwad
2012-07-17 13:20 ` Mark Brown
2012-07-17 13:20 ` Mark Brown
2012-07-17 14:22 ` Prashant Gaikwad
2012-07-17 14:34 ` Prashant Gaikwad
2012-07-17 14:37 ` Mark Brown
2012-07-17 14:37 ` Mark Brown
2012-07-18 12:46 ` Prashant Gaikwad
2012-07-18 12:58 ` Prashant Gaikwad
2012-07-18 21:19 ` Mark Brown
2012-07-18 21:19 ` Mark Brown
2012-07-18 17:08 ` Shawn Guo
2012-07-18 17:08 ` Shawn Guo
2012-07-11 13:08 함명주
2012-07-11 13:08 ` 함명주
2012-07-11 13:49 ` Peter De Schrijver
2012-07-11 13:49 ` Peter De Schrijver
2012-07-11 13:49 ` Peter De Schrijver
2012-07-11 13:49 ` Peter De Schrijver
2012-07-12 4:22 ` Prashant Gaikwad
2012-07-12 4:34 ` Prashant Gaikwad
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