RE: [PATCH/RFC 07/19] OMAP3: voltage: add scalable flag to voltagedomain

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> -----Original Message-----
> From: Cousson, Benoit [mailto:b-cousson@xxxxxx]
> Sent: Thursday, March 24, 2011 8:24 PM
> To: Hilman, Kevin
> Cc: Sripathy, Vishwanath; linux-omap@xxxxxxxxxxxxxxx; Paul Walmsely
> Subject: Re: [PATCH/RFC 07/19] OMAP3: voltage: add scalable flag to
> voltagedomain
>
> On 3/24/2011 3:12 PM, Hilman, Kevin wrote:
> > Vishwanath Sripathy<vishwanath.bs@xxxxxx>  writes:
> >
> >>> -----Original Message-----
> >>> From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap-
> >>> owner@xxxxxxxxxxxxxxx] On Behalf Of Kevin Hilman
> >>> Sent: Thursday, March 24, 2011 5:30 AM
> >>> To: linux-omap@xxxxxxxxxxxxxxx
> >>> Cc: Paul Walmsely; Benoit Cousson
> >>> Subject: [PATCH/RFC 07/19] OMAP3: voltage: add scalable flag to
> >>> voltagedomain
> >>>
> >>> Add a 'bool scalable' flag to the struct powerdomain and set it for
> >>
> >> I suppose you meant "struct voltagedomain".
> >
> > yes
> >
> >> But shouldn't this flag be part of PMIC struct?
> >> Voltage scalability depends on the kind of VDD supply from PMIC. So
> even
> >> if OMAP supports voltage scaling, we may not be able to scale the
> voltage
> >> if PMIC does not support it.
> >
> > That's a good point.  Probably I can drop this flag and just use the
> > existence of the various fields of the voltage domain (pmic, vc, vp,
> > etc.) to determine if the voltdm can scale.
>
> Mmm, the scalability is still a characteristic of the OMAP voltage
> domain. Some are scalable with a supported range of voltage, some are
> not.
Then should we need this flag in both Voltage domain as well as PMIC?
If both are scalable then only voltage can be scaled I suppose.

Vishwa
>
> So that information is relevant in the voltage domain. Then the
> regulator framework will have as well some information about the range
> that should match what OMAP is able to do.
>
> Benoit
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