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From: Richard Zhao <richard.zhao-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
To: Mark Brown
	<broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>
Cc: Kevin Hilman <khilman-l0cyMroinI0@public.gmane.org>,
	Nishanth Menon <nm-l0cyMroinI0@public.gmane.org>,
	Russell King - ARM Linux
	<linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
	linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
	cpufreq-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org>,
	Mike Turquette
	<mturquette-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH 3/3] cpufreq: Add a generic cpufreq-cpu0 driver
Date: Fri, 27 Jul 2012 10:13:04 +0800	[thread overview]
Message-ID: <20120727021303.GB3347@b20223-02.ap.freescale.net> (raw)
In-Reply-To: <20120726131121.GB7306-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>

On Thu, Jul 26, 2012 at 02:11:21PM +0100, Mark Brown wrote:
> On Thu, Jul 19, 2012 at 11:54:41PM +0800, Shawn Guo wrote:
> 
> > +Optional properties:
> > +- transition-latency: Specify the possible maximum transition latency,
> > +  in unit of nanoseconds.
> 
> This should make it clear that the transition latency being documented
> here is just that for the core clock change itself, there may be other
> sources of latency like the regulator ramp time or reprogramming PLLs.
I think it's the total time and board dts can over-write it if it
needs. Different transitions between different operating points may
differ, and regulator may be able to indicate the transition time but
clk don't have such api, and probably not worth to have.
 
Thanks
Richard

WARNING: multiple messages have this Message-ID (diff)
From: richard.zhao@freescale.com (Richard Zhao)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/3] cpufreq: Add a generic cpufreq-cpu0 driver
Date: Fri, 27 Jul 2012 10:13:04 +0800	[thread overview]
Message-ID: <20120727021303.GB3347@b20223-02.ap.freescale.net> (raw)
In-Reply-To: <20120726131121.GB7306@sirena.org.uk>

On Thu, Jul 26, 2012 at 02:11:21PM +0100, Mark Brown wrote:
> On Thu, Jul 19, 2012 at 11:54:41PM +0800, Shawn Guo wrote:
> 
> > +Optional properties:
> > +- transition-latency: Specify the possible maximum transition latency,
> > +  in unit of nanoseconds.
> 
> This should make it clear that the transition latency being documented
> here is just that for the core clock change itself, there may be other
> sources of latency like the regulator ramp time or reprogramming PLLs.
I think it's the total time and board dts can over-write it if it
needs. Different transitions between different operating points may
differ, and regulator may be able to indicate the transition time but
clk don't have such api, and probably not worth to have.
 
Thanks
Richard

  parent reply	other threads:[~2012-07-27  2:13 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-19 15:54 [PATCH 0/3] Add a generic cpufreq-cpu0 driver Shawn Guo
2012-07-19 15:54 ` Shawn Guo
2012-07-19 15:54 ` [PATCH 1/3] ARM: add cpufreq transiton notifier to adjust loops_per_jiffy for smp Shawn Guo
2012-07-19 15:54   ` Shawn Guo
2012-07-20  6:36   ` Shilimkar, Santosh
2012-07-20  6:36     ` Shilimkar, Santosh
2012-07-20  7:56     ` Shawn Guo
2012-07-20  7:56       ` Shawn Guo
2012-07-20  8:27       ` Shilimkar, Santosh
2012-07-20  8:27         ` Shilimkar, Santosh
2012-07-19 15:54 ` [PATCH 2/3] PM / OPP: Initialize OPP table from device tree Shawn Guo
2012-07-19 15:54   ` Shawn Guo
2012-07-20  6:00   ` Menon, Nishanth
2012-07-20  6:00     ` Menon, Nishanth
2012-07-20  8:46     ` Shawn Guo
2012-07-20  8:46       ` Shawn Guo
2012-07-20  9:04       ` Menon, Nishanth
2012-07-20  9:04         ` Menon, Nishanth
2012-07-19 15:54 ` [PATCH 3/3] cpufreq: Add a generic cpufreq-cpu0 driver Shawn Guo
2012-07-19 15:54   ` Shawn Guo
2012-07-20  6:52   ` Shilimkar, Santosh
2012-07-20  6:52     ` Shilimkar, Santosh
     [not found]     ` <CAMQu2gw32LogXJJa+K5ZjmCZzBNK3FY2wYwZXU8fsftsVzEO2Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-07-20 12:33       ` Shawn Guo
2012-07-20 12:33         ` Shawn Guo
2012-07-20 15:50         ` Turquette, Mike
2012-07-20 15:50           ` Turquette, Mike
2012-07-21  5:04           ` Shilimkar, Santosh
2012-07-21  5:04             ` Shilimkar, Santosh
2012-07-21  6:38             ` Shawn Guo
2012-07-21  6:38               ` Shawn Guo
2012-07-27  2:04               ` Richard Zhao
2012-07-27  2:04                 ` Richard Zhao
2012-07-30  4:57                 ` Shawn Guo
2012-07-30  4:57                   ` Shawn Guo
2012-07-20 12:51   ` Richard Zhao
2012-07-20 12:51     ` Richard Zhao
2012-07-20 13:15     ` Shawn Guo
2012-07-20 13:15       ` Shawn Guo
     [not found]   ` <1342713281-31114-4-git-send-email-shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2012-07-26 13:11     ` Mark Brown
2012-07-26 13:11       ` Mark Brown
     [not found]       ` <20120726131121.GB7306-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2012-07-27  2:13         ` Richard Zhao [this message]
2012-07-27  2:13           ` Richard Zhao
2012-07-27 10:08           ` Mark Brown
2012-07-27 10:08             ` Mark Brown
2012-07-30  6:52       ` Shawn Guo
2012-07-30  6:52         ` Shawn Guo
2012-07-30  8:20         ` Shawn Guo
2012-07-30  8:20           ` Shawn Guo
2012-07-30 18:55           ` Mark Brown
2012-07-30 18:55             ` Mark Brown
2012-07-30 18:53         ` Mark Brown
2012-07-30 18:53           ` Mark Brown
2012-07-31  4:20           ` Shawn Guo
2012-07-31  4:20             ` Shawn Guo
2012-07-31 13:40             ` Mark Brown
2012-07-31 13:40               ` Mark Brown
2012-07-27  6:33   ` Richard Zhao
2012-07-27  6:33     ` Richard Zhao
2012-07-30  8:17     ` Shawn Guo
2012-07-30  8:17       ` Shawn Guo
2012-07-30  8:50       ` Richard Zhao
2012-07-30  8:50         ` Richard Zhao
2012-07-30  9:24         ` Shawn Guo
2012-07-30  9:24           ` Shawn Guo
2012-07-19 18:39 ` [PATCH 0/3] " Rafael J. Wysocki
2012-07-19 18:39   ` Rafael J. Wysocki
2012-07-20  0:29   ` Shawn Guo
2012-07-20  0:29     ` Shawn Guo

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