linux-kernel - [PATCH linux-next v4 0/4] Support timer drivers as loadable modules

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Message-ID: <20230421034649.15247-1-walter.chang@mediatek.com>
Date:   Fri, 21 Apr 2023 11:46:45 +0800
From:   <walter.chang@...iatek.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        "Maciej W . Rozycki" <macro@...am.me.uk>,
        John Stultz <jstultz@...gle.com>
CC:     <wsd_upstream@...iatek.com>, <stanley.chu@...iatek.com>,
        <Chun-hung.Wu@...iatek.com>, <Freddy.Hsin@...iatek.com>,
        <walter.chang@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH linux-next v4 0/4] Support timer drivers as loadable modules

From: Walter Chang <walter.chang@...iatek.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

[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(-)

-- 
2.18.0