Re: [PATCH 13/26] ARM: omap3.dtsi: add omapdss information

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2013-12-13 05:27, Laurent Pinchart wrote:
> Hi Tony,
> 
> On Thursday 12 December 2013 21:59:13 Tony Lindgren wrote:
>> On Thu, Dec 12, 2013 at 10:38:34AM +0200, Tomi Valkeinen wrote:
>>> On 2013-12-12 01:44, Laurent Pinchart wrote:
>>>
>>> So, are they independent? I don't know =). I think they lean on the
>>> independent side. dss_core is always needed for the submodules to work,
>>> but for example DSI could be used without DISPC, using system DMA to
>>> transfer data from memory to DSI. Not a very useful thing to do, but
>>> still, there are dedicated DMA channels for that.
>>
>> If they have separate hwmod entries, they should be considered separate
>> independent devices for sure.
>>
>> To summarize, here are few reasons why they need to be treated as
>> separate devices:
> 
> Are you talking generally here, or about the DSS modules in particular ?
> 
>> 1. The modules maybe clocked/powered/idled separately and can have their
>>    own idle configuration so they can do the hardware based idling
>>    separately.
> 
> I don't think this applies to the DSS modules.

The DSS submodules have their own SYSCONFIG register, and idle settings
can be set per module. So I think they idle separately, even if they are
in a common power domain.

 Tomi


Attachment: signature.asc
Description: OpenPGP digital signature


[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux