Re: How to put TWL/TPS into sleep?

[Mike Rapoport <mike@compulab.co.il>]

Lesly AM wrote:
> 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.


Thanks a lot. This is really helpful :)

>>
>>
>> -- 
>> Sincerely yours,
>> Mike.
>> -- 
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> 


-- 
Sincerely yours,
Mike.