On 06/04/2013 18:40, Fabio Estevam wrote:
Hi Dirk,
On Sat, Apr 6, 2013 at 1:30 PM, Dirk Behme dirk.behme@gmail.com wrote:
... but saving power over the whole (kernel) runtime. I might be wrong, but to my understanding the kernel doesn't *disable* unneeded clocks?
So it's up to the bootloader to enable only the peripherals (clocks) really needed for booting. And then it's up to the kernel's driver init functions to enable the needed clocks for the subsystem once it's needed.
But as I won't use this board I won't care about the power consumption here. If you think it's fine for the use cases of this board to enable all clocks by default, then this shouldn't stop applying this patch.
Ok, understood. I will go through each one of the CCM registers and check what clocks can be turned off.
This may take some time though as it needs proper testing.
I suggest that we keep the current clock settings as is, so that the board support can reach U-boot, then later I can submit a patch for turning off the unneeded clocks.
+1
Best regards, Stefano