linux-kernel - [PATCH v2 00/20] Add support for the NXP automotive S32G PIT

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Message-ID: <20250730082725.183133-1-daniel.lezcano@linaro.org>
Date: Wed, 30 Jul 2025 10:27:02 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: daniel.lezcano@...aro.org,
	tglx@...utronix.de
Cc: S32@....com,
	linux-kernel@...r.kernel.org,
	ghennadi.procopciuc@....nxp.com
Subject: [PATCH v2 00/20] Add support for the NXP automotive S32G PIT

The S32G platform has a couple of Programable Interrupt Timer
(PIT). This timer is the same IP as the one found on the Vybrid Family
platform. The main difference is there are multiple instances of this
timer on the S32G.

Before bringing the support for the S32G in the driver, a
pre-requesite must be accomplished to support multiple instances of
the timer in the driver. While at it, take also the opportunity to
clean up the code and make it consistent with the NXP STM timer which
looks similar to the PIT.

The two changes fix the raw_(readl|writel) usage where it is replaced
by readl|writel. In order to compile test the changes, the Kconfig
COMPILE_TEST option is added.

The other changes encapsulate more the codes into self-explanatory
functions, allow to pass the per instance information as parameters to
functions and use different names for the timers in order to be able
to distinguish them.

The last two changes provide the DT bindings and the S32G specific
changes to support multiple instances.

Changelog:
  - v2:
    - Added a cover letter (Ghennadi Procopciuc)
    - Fixed typo in descriptions (Ghennadi Procopciuc)
    - Clarified comment about channel usage (Ghennadi Procopciuc)
    - Added a description for the bindings (Rob Herring)
    - Initialized sched_clock global variable (Ghennadi Procopciuc)
    - Changed type for the 'cpu' parameter s/int/unsigned int/ (Ghennadi Procopciuc)
    - Fixed wrong bitwise negation when reading the counter (Ghennadi Procopciuc)
    - Changed type s/int/u32/ for writel (Ghennadi Procopciuc)
    - Clarified changelog with S32G support (Ghennadi Procopciuc)

  - v1: Initial post

Daniel Lezcano (20):
  clocksource/drivers/vf-pit: Replace raw_readl/writel to reald/writel
  clocksource/drivers/vf-pit: Add COMPILE_TEST option
  clocksource/drivers/vf-pit: Set the scene for multiple timers
  clocksource/drivers/vf-pit: Rework the base address usage
  clocksource/drivers/vf-pit: Pass the cpu number as parameter
  clocksource/drivers/vf-pit: Encapsulate the initialization of the
    cycles_per_jiffy
  clocksource/drivers/vf-pit: Allocate the struct timer at init time
  clocksource/drivers/vf-pit: Convert raw values to BIT macros
  clocksource/drivers/vf-pit: Register the clocksource from the driver
  clocksource/drivers/vf-pit: Encapsulate the macros
  clocksource/drivers/vf-pit: Encapsulate the PTLCVAL macro
  clocksource/drivers/vf-pit: Use the node name for the interrupt and
    timer names
  clocksource/drivers/vf-pit: Encapsulate clocksource enable / disable
  clocksource/drivers/vf-pit: Enable and disable module on error
  clocksource/drivers/vf-pit: Encapsulate set counter function
  clocksource/drivers/vf-pit: Consolidate calls to pit_*_disable/enable
  clocksource/drivers/vf-pit: Unify the function name for irq ack
  clocksource/drivers/vf-pit: Rename the VF PIT to NXP PIT
  dt: bindings: fsl,vf610-pit: Add compatible for s32g2 and s32g3
  clocksource/drivers/nxp-pit: Add NXP Automotive s32g2 / s32g3 support

 .../bindings/timer/fsl,vf610-pit.yaml         |   8 +-
 drivers/clocksource/Kconfig                   |   9 +-
 drivers/clocksource/Makefile                  |   2 +-
 drivers/clocksource/timer-nxp-pit.c           | 371 ++++++++++++++++++
 drivers/clocksource/timer-vf-pit.c            | 194 ---------
 5 files changed, 384 insertions(+), 200 deletions(-)
 create mode 100644 drivers/clocksource/timer-nxp-pit.c
 delete mode 100644 drivers/clocksource/timer-vf-pit.c

-- 
2.43.0