From: "Lesly AM" <x0080970@ti.com>
To: Mike Rapoport <mike@compulab.co.il>, linux-omap@vger.kernel.org
Subject: Re: How to put TWL/TPS into sleep?
Date: Thu, 21 Jan 2010 20:34:38 +0530 [thread overview]
Message-ID: <032901ca9aab$0e9ac6b0$LocalHost@wipultra1385> (raw)
In-Reply-To: 4B583E62.80603@compulab.co.il
Hi Mike,
----- Original Message -----
From: "Mike Rapoport" <mike@compulab.co.il>
To: <linux-omap@vger.kernel.org>
Sent: Thursday, January 21, 2010 5:15 PM
Subject: How to put TWL/TPS into sleep?
> Hi all,
> I'm trying to achieve maximal power savings on omap3 based system with
> TPS65930 PMIC using twl4030_script and twl4030_resconfig. I've tried
> different resource mappings and different command sequences in the
> sleep/wakeup scripts by to no avail. Moreover, with some resource
> definitions and sleep/wakeup scripts the system behaves in a weird ways,
> e.g. does not properly respond to hard resets.
> Most probably my resource remapping and command sequences are wrong and
> this is the reason for system misbehavior.
>
> However, several things are completely unclear to me:
> * Does TPS/TWL have defaults for sleep-on and sleep-off transitions?
AFIK TPS659x & TWL4030 is same chip, may have some Si version(ES 1.x)
difference.
So the power seqeunce used on TWL4030, should work on TPS659x also.
> * What would happen if nSLEEP1 would go low/high and there is no
> sleep/wakeup sequence programmed?
By default reset value for the resgister pointing to [sleep/wakeup/wrst] seq
is 0x3F, which is the exit addr for seq.
So the TRITON resources will not have any change.
> * If I have a sleep sequence that disables some power resources, what
> would be the state of the other resources?
If you are using singular messages in the seq, you can address each resource
by specifying the Resource_id.
But if you are using broadcast messages, the resources which will respond
depends on the Resource_group, TYPE & TYPE2 values.
>
> I've read the TPS TRM several times to now and I still got now clue
> about what's going on there :(
You can verify wether your clk/volt setup_time holds good.
>
>
> --
> Sincerely yours,
> Mike.
> --
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>
next prev parent reply other threads:[~2010-01-21 15:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-21 11:45 How to put TWL/TPS into sleep? Mike Rapoport
2010-01-21 15:04 ` Lesly AM [this message]
2010-01-24 6:47 ` Mike Rapoport
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