[PATCH 09/12] ARM: OMAP2+: powerdomain: skip register reads for powerdomains known to be on

Santosh Shilimkar santosh.shilimkar at ti.com
Fri Dec 21 01:33:33 EST 2012

On Thursday 20 December 2012 10:52 PM, Paul Walmsley wrote:
> On Wed, 19 Dec 2012, Jon Hunter wrote:
>> My understanding is that for OMAP4 devices, the core power domain may
>> not be active the same time as the MPU power domain. The Cortex-A9 has
>> the ability to access some peripherals (such as timer, McBSP) via a
>> private bus that does not require the core domain to be active. This is
>> a difference from OMAP3 devices, where the core would always be on with
>> the MPU power domain.
> You are absolutely right and I will drop that part from this patch.
Just to be clear, MPU has direct path to ABE domain peripherals on
OMAP4. As Jon pointed out MCBSP and few timers are put under this
domain can be directly accessed by MPU without L3. ABE also can
be accessed via L3 by MPU. ABE has a dual map with MPU.


More information about the linux-arm-kernel mailing list