[PATCH v5 0/4] clocksource: Add module support for timer drivers

[Zhipeng Wang <zhipeng.wang_1@nxp.com>]

This patch series enables SoC-specific timer drivers to be built as 
loadable modules for Generic Kernel Image (GKI). SoC-specific timer 
drivers provide always-on broadcast timers that complement the ARM 
architectural timer.

This series is based on the previous MediaTek timer modularization work:
Link: https://lore.kernel.org/all/20230517022557.24388-1-walter.chang@mediatek.com/

The series includes:
1. Export necessary functions from clocksource/mmio
2. Remove __init markings from timer-of to support modules
3. Convert MediaTek timer driver to support module build
4. Convert i.MX TPM timer driver to support module build

Testing performed:
- Built and tested on i.MX8ULP platform
- Built and tested on MediaTek platform
- Verified both built-in and module configurations
- Confirmed timer functionality in both configurations

Changes in v5:
- Conditionally compile delay timer and sched_clock registration
  only when built-in (!MODULE) to avoid calling __init functions
  from module code.

Changes in v4:
- Refined the cover letter introduction to clarify that SoC-specific
  timers act as always-on broadcast timers complementing the ARM
  architectural timer.
- Expanded "GKI" to "Generic Kernel Image (GKI)" in commit messages.
- No functional changes to the code.

Changes in v3:
- Reworded summary line for timer-mediatek driver as suggested.
- Improved commit message formatting (line wrapping).
- No functional changes to the code.

Changes in v2:
- Added Signed-off-by from submitter (Zhipeng Wang) to all patches
  as requested by reviewers

Changes in v1:
- Fixed 'unsigned' to 'unsigned int' in clocksource_mmio_init()
- Changed MODULE_LICENSE from "GPL v2" to "GPL" for mediatek driver
- Added i.MX TPM timer driver module support

Chun-Hung Wu (3):
  clocksource/drivers/mmio: Export clocksource_mmio_init()
  clocksource/drivers/timer-of: Remove __init markings
  clocksource/drivers/timer-mediatek: Convert timer-mediatek to a
    loadable module

Jindong Yue (1):
  clocksource/drivers/imx-tpm: Support building imx-tpm driver as module

 drivers/clocksource/Kconfig          |  4 +--
 drivers/clocksource/mmio.c           |  8 +++---
 drivers/clocksource/timer-imx-tpm.c  | 40 ++++++++++++++++++++++++----
 drivers/clocksource/timer-mediatek.c | 33 +++++++++++++++++++++++
 drivers/clocksource/timer-of.c       | 23 ++++++++--------
 drivers/clocksource/timer-of.h       |  6 ++---
 6 files changed, 90 insertions(+), 24 deletions(-)


base-commit: bc47b2e823914966c15a09422f8fc3aa98d34c1b
-- 
2.34.1