d048137e85
Add a watchdog driver for the external management MCU on Hasivo /
Horaco network switches, reachable over I2C. Without periodic
keepalive the MCU resets the board every ~3 minutes.
The driver arms the MCU at probe and registers a struct
watchdog_device with WDOG_HW_RUNNING so the watchdog core feeds the
chip via a kernel timer until userspace opens the watchdog node.
Timeout is fixed at 15s; the hardware threshold is baked into MCU
firmware and is not software-configurable.
The I2C address is supplied per-board in the device tree via the
`reg` property. The driver does not constrain or probe a specific
address. Known addresses across current Hasivo / Horaco silicon:
- 0x6F: Hasivo S1300WP-8XGT-4S+, Hasivo F5800W-12S+,
Horaco ZX-SW82TS-L2P (default / most common)
- 0x6E: alternate Hasivo / Horaco variant
The driver, its device-tree binding and the Kconfig/Makefile wiring
are added to the kernel tree as a realtek target patch and exposed as
the kmod-hasivo-mcu-wdt KernelPackage. Keeping the binding in the
kernel tree lets dt_binding_check exercise it during the build and
makes the whole driver easy to drop once it lands upstream.
Tested on Hasivo S1300WP-8XGT-4S+ (RTL9313). Unbinding the driver
causes the MCU to power-cycle the board within ~15s.
Signed-off-by: Carlo Szelinsky <github@szelinsky.de>
Link: https://github.com/openwrt/openwrt/pull/23418
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
42 lines
1.3 KiB
Makefile
42 lines
1.3 KiB
Makefile
#
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# Copyright (C) 2011 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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MFD_MENU:=MultiFunction Device (MFD) Support
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WATCHDOG_MENU:=Watchdog Timer Support
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define KernelPackage/hasivo-mcu-wdt
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SUBMENU:=$(WATCHDOG_MENU)
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TITLE:=Hasivo MCU watchdog driver
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KCONFIG:=CONFIG_HASIVO_MCU_WATCHDOG
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FILES:=$(LINUX_DIR)/drivers/watchdog/hasivo-mcu-wdt.ko
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DEPENDS:=@TARGET_realtek +kmod-i2c-core
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AUTOLOAD:=$(call AutoProbe,hasivo-mcu-wdt,1)
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endef
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define KernelPackage/hasivo-mcu-wdt/description
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Hardware watchdog driver for the external management MCU found on
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Hasivo / Horaco network switches. Registers a Linux watchdog device;
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the kernel watchdog core feeds it automatically via its own timer.
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endef
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$(eval $(call KernelPackage,hasivo-mcu-wdt))
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define KernelPackage/mfd-hasivo-stc8
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SUBMENU:=$(MFD_MENU)
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TITLE:=Hasivo STC8 microcontroller support
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KCONFIG:=CONFIG_MFD_HASIVO_STC8
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FILES:=$(LINUX_DIR)/drivers/mfd/hasivo-stc8-mfd.ko
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DEPENDS:=@TARGET_realtek +kmod-mfd +kmod-regmap-i2c
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AUTOLOAD:=$(call AutoProbe,hasivo-stc8-mfd)
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endef
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define KernelPackage/mfd-hasivo-stc8/description
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Kernel module for Hasivo STC8 microcontroller support
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endef
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$(eval $(call KernelPackage,mfd-hasivo-stc8))
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