[U-Boot] AM/DM37X How to configure registers to get 1000MHz

[Enric Balletbò i Serra]

Hi,

2010/11/19 Premi, Sanjeev <premi at ti.com>:
>> -----Original Message-----
>> From: Enric Balletbò i Serra [mailto:eballetbo at gmail.com]
>> Sent: Friday, November 19, 2010 6:30 PM
>> To: Premi, Sanjeev
>> Cc: u-boot at lists.denx.de; Steve Sakoman
>> Subject: Re: [U-Boot] AM/DM37X How to configure registers to
>> get 1000MHz
>>
>> Hi,
>>
>> Thanks for your reply
>>
>> 2010/11/19 Premi, Sanjeev <premi at ti.com>:
>> >> -----Original Message-----
>> >> From: u-boot-bounces at lists.denx.de
>> >> [mailto:u-boot-bounces at lists.denx.de] On Behalf Of Enric
>> >> Balletbò i Serra
>> >> Sent: Friday, November 19, 2010 2:42 PM
>> >> To: u-boot at lists.denx.de; Steve Sakoman
>> >> Subject: [U-Boot] AM/DM37X How to configure registers to
>> get 1000MHz
>> >>
>> >> Hi all,
>> >>
>> >> I would ask a question, maybe someone can help, which is the better
>> >> way to configure the PRCM registers to get 1000MHz on AM/DM37X
>> >> processor ?
>> >
>> > You need set the multipliers and dividers apprioriately -
>> based on the
>> > sysclk.
>> >
>> > Would help to understand the context of "better"?
>>
>> I'm thinking in two scenarios :
>>
>> 1. For OMAP35X there are devices that support 600MHz as max frequency
>> but others supports 720MHz, I want to set by default 600MHz and if
>> device supports 720MHz change to this frequency.
>
> [sp] You can look at one of my patches on linux kernel to identify the
>     device capability for 600/720MHz.

I''ll do, thanks

>
>> 2. For AM/DM37X, maybe I'm wrong, but the default frequency for
>> AM/DM37X is set to 600MHz, Like OMAP35X i want to set default to
>> 800MHz and i device supports change to 1000MHz.
>
> [sp] The device comes up at 600MHz for now, but there is no limitation
>     on device to go all the way to 1GHz.
>
>>
>> Which is the better way to do this ?
>
> [sp] So, you are looking for common mechanism to go to highest supported
>     frequency. Right?

Yes, I think should be interesting for all OMAP35/AM/DM37 a mechanism like this.

>
>>
>> Thanks in advance,
>>    Enric
>>
>> >
>> > ~sanjeev
>> >
>> >>
>> >> Thanks in advance,
>> >>    Enric
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>>