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(146725694.box.freepro.com. [130.180.211.218]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43eb5fd1194sm24674555e9.11.2025.04.02.08.49.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Apr 2025 08:49:52 -0700 (PDT) From: Daniel Lezcano To: wim@linux-watchdog.org Cc: linux@roeck-us.net, linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, S32@nxp.com, ghennadi.procopciuc@nxp.com, thomas.fossati@linaro.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org Subject: [PATCH v2 0/2] Add the NXP S32 Watchdog Date: Wed, 2 Apr 2025 17:49:38 +0200 Message-ID: <20250402154942.3645283-1-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The NXP S32 watchdog, referenced in the documentation as the Software Watchdog Timer is actually a hardware watchdog. The system has one watchdog per core but an assertation does not directly reset the system as this behavior relies on a particular setup and another component which is not part of these changes. However the first watchdog on the system, tied with the Cortex-M4 #0 is a particular case where it will reset the system directly. This is enough for the watchdog purpose on Linux. The watchdog relies on the default timeout described in the device tree but if another timeout is needed at boot time, it can be changed with the module parameter. If the kernel has to service the watchdog in place of the userspace, it can specify the 'early-enable' option at boot time. And finally, if starting the watchdog has no wayback then the option 'nowayout' can be also specified in the boot option. Changelog: - v2: - Removed debugfs code as considered pointless for a such simple driver (Arnd Bergmann) - Replaced __raw_readl / __raw_writel by readl and writel (Arnd Bergmann) - Reordered alphabetically the headers (Guenter Roeck) - Enclosed macro parameter into parenthesis (Guenter Roeck) - Fixed checkpatch reported errors (Guenter Roeck) - Clarified a ping on a stopped timer does not affect it (Guenter Roeck) - Used wdt_is_running() to save an extra IO (Guenter Roeck) - Fixed a misleading comment about starting the watchdog at boot time (Guenter Roeck) - Replaced allocation size sizeof(struct ...) by sizeof(*var) (Krzysztof Kozlowski) - Drop old way of describing the module and use table module device (Krzysztof Kozlowski) - Replaced additionalProperties by unevaluatedProperties (Rob Herring) - Removed the DT bindings description as it is obvious (Ghennadi Procopciuc) - Fixed DT bindings compatible string (Krzysztof Kozlowski) - v1: initial posting Daniel Lezcano (2): dt-bindings: watchdog: Add NXP Software Watchdog Timer watchdog: Add the Watchdog Timer for the NXP S32 platform .../bindings/watchdog/nxp,s32g2-swt.yaml | 42 +++ drivers/watchdog/Kconfig | 9 + drivers/watchdog/Makefile | 1 + drivers/watchdog/s32g_wdt.c | 313 ++++++++++++++++++ 4 files changed, 365 insertions(+) create mode 100644 Documentation/devicetree/bindings/watchdog/nxp,s32g2-swt.yaml create mode 100644 drivers/watchdog/s32g_wdt.c