[Letux-kernel] Understanding OMAP5 DPLL_ABE and CM_CLKSEL_WKUPAON

[H. Nikolaus Schaller]

Hi David and Tony,

> Am 28.07.2020 um 10:42 schrieb Tony Lindgren <tony at atomide.com>:
> 
> * David Shah <dave at ds0.me> [200727 08:58]:
>> On Mon, 2020-07-27 at 01:28 -0700, Tony Lindgren wrote:
>>> If it only needs to be configured to 1 for reboot, sounds like it
>>> should
>>> be set in omap44xx_restart(). And we should also set it to 1 for
>>> omap4
>>> too.
>> 
>> omap44xx_restart doesn't seem like the right place to me, as the bug
>> also affects hard resets (i.e. NRESWARM assertion) and it would be nice
>> to have these working, too.
> 
> Ah right, the device reboots fine, but the rebooted kernel
> won't initialize properly.
> 
>> Would a better solution be to set it early during startup (the first
>> part of clock init), and then clear it when the DPLLs are set up and
>> locked?
> 
> Yes sounds like then the place to configure this is in the
> drivers/clk/ti/clk-54xx.c omap5xxx_dt_clk_init(). Maybe add
> a comment to the patch description that a similar patch may
> be also needed for omap4 on some devices.

It seems as if the conclusion was that the patch is at the right
location omap5xxx_dt_clk_init(). Has it been merged somewhere?

It seems as if we still need it in our 5.10-rc series:

https://git.goldelico.com/?p=letux-kernel.git;a=commit;h=aa8eda144e8faa185e154710ca0eef12adb2d29d

BR and thanks,
Nikolaus