On Fri, Jan 16, 2015 at 10:09 PM, Mark Rutland <mark.rutland@xxxxxxx> wrote:
> On Fri, Jan 16, 2015 at 12:49:20PM +0000, Orson Zhai wrote:
>> Hi, Mark,
>>
>> On Fri, Jan 16, 2015 at 6:35 PM, Mark Rutland <mark.rutland@xxxxxxx> wrote:
>[...]
>>
>> It returns "status busy" after I type the command below.
>
> Is this while other CPUs are active, or after you've hotplugged out all
> other CPUs? The latter is expected, but the former is not.
>
> Are you able to hotplug CPU0 out and back in while other CPUs are
> active
Yes, I have just tested again and confirm that cpu0 could be
turned on/off when one of the other 3 CPUs was active.
>
> [...]
>
> For this bus you could instead use addresses relative to the bus inside,
> rather than absolute addresses,
Do you mean something like apb@0 {...} apb@1 {...} ?
> or you could have:
>
> ranges = <0x0 0x70000000 0x0 0x70000000 0x0 0x10000000>;
>
> [...]
>>
>> This initial patch is picked up from a very big dt file.
>> There are several apb buses in this chip.
>
> At the same level us the bus hierarchy?
>
These buses are led by some bus matrix to different areas.
But I'd like treat them simply at same level.
Is it right to do that?
>> So I use apb@starting-address to separate them.
>> But I remember another rule that the @address needs to equal first
>> address in property reg array.
>> Do I have to delete @7000000 as well if i delete reg line?
>
> Hmm. I'm not too keen on encoding a reg or unit-address here, because
> the control interface of the bus isn't at that address. If we want to
> add that later then the reg would be different in those cases. Given
> there's no control interface here, there shouldn't be a reg or
> unit-address.
>
Do you mean something like
ap-ahb { ... };
aon-ahb { ... };
without using @xxxx ?
Thanks, Orson
> Just ensure that the name before the unit-address is unique.
>
> Thanks,
> Mark.
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