mbox series

[v5,0/4] Support timer drivers as loadable modules

Message ID 20230517022557.24388-1-walter.chang@mediatek.com (mailing list archive)
Headers show
Series Support timer drivers as loadable modules | expand

Message

Walter Chang (張維哲) May 17, 2023, 2:25 a.m. UTC
From: Walter Chang <walter.chang@mediatek.com>

This set of patches aims to make SoC related timer drivers, such as 
timer-mediatek.c become loadable modules for the Generic Kernel Image
(GKI).

This driver registers an always-on timer as tick_broadcast_device on 
MediaTek SoCs. If the system does not load this module at startup, 
system will also boot normally by using built-in `bc_hrtimer` instead.
Besides, the previous experiment [1] indicates that the SYST/GPT, in 
combination with a loadable module, is fully operational.

The first three patches export functions and remove __init markings to 
support loadable timer modules.

The fourth patch makes timer-mediatek.c become loadable module for GKI.

[1]
https://lore.kernel.org/all/32777456f8e0f98e4cd5b950f421d21f71b149cf.camel@mediatek.com/#t

[v5]
- Add Signed-off-by tags in all patches
- Add Acked-by tags and Reviewed-by tags

[v4]
- Fix review comments pointed by Angelo

[v3]
- Rebase on linux-next

[v2]
- Convert timer-mediatek.c driver to loadable module

Chun-Hung Wu (4):
  time/sched_clock: Export sched_clock_register()
  clocksource/drivers/mmio: Export clocksource_mmio_init()
  clocksource/drivers/timer-of: Remove __init markings
  clocksource/drivers/timer-mediatek: Make timer-mediatek become
    loadable module

 drivers/clocksource/Kconfig          |  2 +-
 drivers/clocksource/mmio.c           |  8 ++++---
 drivers/clocksource/timer-mediatek.c | 33 ++++++++++++++++++++++++++++
 drivers/clocksource/timer-of.c       | 23 +++++++++----------
 drivers/clocksource/timer-of.h       |  6 ++---
 kernel/time/sched_clock.c            |  4 ++--
 6 files changed, 56 insertions(+), 20 deletions(-)

Comments

Walter Chang (張維哲) July 6, 2023, 1:07 a.m. UTC | #1
On Mon, 2023-06-19 at 18:44 +0200, Daniel Lezcano wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  
> As I already said, I'm not very comfortable with these changes and
> the 
> potential impact it can have on the overall time framework.
> 
> I will pick the series if Thomas gives its Acked-by
> 
> Thanks
> 
> 

Thanks for letting me know. I will wait for Thomas's response.

Thanks,
Walter Chang
Walter Chang (張維哲) Jan. 23, 2024, 2:40 a.m. UTC | #2
On Mon, 2023-06-19 at 18:44 +0200, Daniel Lezcano wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  
> As I already said, I'm not very comfortable with these changes and
> the 
> potential impact it can have on the overall time framework.
> 
> I will pick the series if Thomas gives its Acked-by
> 
> Thanks
> 

Hi Thomas,

Gentle ping for this series.

We would like to know your opinion on the time framework changes we've
discussed.

Thanks,
Walter Chang