linux-kernel - [PATCH 0/8] Add the STM and the SWT descriptions for the s32g2 and s32g3

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Message-ID: <20250730195022.449894-1-daniel.lezcano@linaro.org>
Date: Wed, 30 Jul 2025 21:50:13 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: mbrugger@...e.com,
	chester62515@...il.com,
	ghennadi.procopciuc@....nxp.com,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de
Cc: s32@....com,
	kernel@...gutronix.de,
	festevam@...il.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/8] Add the STM and the SWT descriptions for the s32g2 and s32g3

The NXP S32 SoC family includes timers and watchdogs that can be
dedicated to the CPUs present in the system. The documentation refers
to them as the System Timer Module (STM) and the Software Watchdog
Timer (SWT).  This design originates from the automotive domain, where
the SoC can be partitioned, and a group of CPUs may run different
operating systems or firmware.

On the S32G2, we found 8 timers and 7 watchdogs. On the S32G3, there
are 12 timers and 12 watchdogs.  Please note that the 8th timer
(STM_07) is not described here, as it is coupled with a specific STM
instance used for timestamping. This makes it somewhat special and
requires custom handling in the driver. It will be added later.

All timers and watchdogs are disabled by default, and are selectively
enabled depending on the platform configuration, which may include
different combinations of Cortex-M7 and Cortex-A53 cores.

This patch series introduces support for the SoC and enables both the
s32g274a-rdb2 and s32g399a-rdb3 platforms.

Testing was done only on the s32g274a-rdb2, as I do not have access to
a s32g399a-rdb3 board.

Daniel Lezcano (8):
  arm64: dts: s32g2: Add the STM description
  arm64: dts: s32g274-rd2: Enable the STM timers
  arm64: dts: s32g3: Add the STM descriptions
  arm64: dts: s32g399a-rdb3: Enable the STM timers
  arm64: dts: s32g2: Add the Software Timer Watchdog (SWT) description
  arm64: dts: s32g274-rd2: Enable the SWT watchdog
  arm64: dts: s32g3: Add the Software Timer Watchdog (SWT) description
  arm64: dts: s32g399a-rdb3: Enable the SWT watchdog

 arch/arm64/boot/dts/freescale/s32g2.dtsi      | 119 +++++++++++
 .../boot/dts/freescale/s32g274a-rdb2.dts      |  20 ++
 arch/arm64/boot/dts/freescale/s32g3.dtsi      | 195 ++++++++++++++++++
 .../boot/dts/freescale/s32g399a-rdb3.dts      |  36 ++++
 4 files changed, 370 insertions(+)

-- 
2.43.0