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2ac8490412
A rather common kind of external watchdog circuit is one that is kept alive by toggling a gpio. Add a driver for handling such a watchdog. The corresponding linux driver apparently has support for some watchdog circuits which can be disabled by tri-stating the gpio, but I have never actually encountered such a chip in the wild; the whole point of adding an external watchdog is usually that it is not in any way under software control. For forward-compatibility, and to make DT describe the hardware, the current driver only supports devices that have the always-running property. I went a little back and forth on whether I should fail ->probe or only ->start, and ended up deciding ->start was the right place. The compatible string is probably a little odd as it has nothing to do with linux per se - however, I chose that to make .dts snippets reusable between device trees used with U-Boot and linux, and this is the (only) compatible string that linux' corresponding driver and DT binding accepts. I have asked whether one should/could add "wdt-gpio" to that binding, but the answer was no: https://lore.kernel.org/lkml/CAL_JsqKEGaFpiFV_oAtE+S_bnHkg4qry+bhx2EDs=NSbVf_giA@mail.gmail.com/ If someone feels strongly about this, I can certainly remove the "linux," part from the string - it probably wouldn't the only place where one can't reuse a DT snippet as-is between linux and U-Boot. Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
40 lines
1.5 KiB
Makefile
40 lines
1.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0+
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#
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# (C) Copyright 2008
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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obj-$(CONFIG_WDT_AT91) += at91sam9_wdt.o
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obj-$(CONFIG_FTWDT010_WATCHDOG) += ftwdt010_wdt.o
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ifneq (,$(filter $(SOC), mx25 mx31 mx35 mx5 mx6 mx7 vf610))
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obj-y += imx_watchdog.o
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else
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obj-$(CONFIG_IMX_WATCHDOG) += imx_watchdog.o
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endif
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obj-$(CONFIG_S5P) += s5p_wdt.o
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obj-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
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obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
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obj-$(CONFIG_DESIGNWARE_WATCHDOG) += designware_wdt.o
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obj-$(CONFIG_ULP_WATCHDOG) += ulp_wdog.o
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obj-$(CONFIG_$(SPL_TPL_)WDT) += wdt-uclass.o
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obj-$(CONFIG_WDT_SANDBOX) += sandbox_wdt.o
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obj-$(CONFIG_WDT_ARMADA_37XX) += armada-37xx-wdt.o
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obj-$(CONFIG_WDT_ASPEED) += ast_wdt.o
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obj-$(CONFIG_WDT_AST2600) += ast2600_wdt.o
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obj-$(CONFIG_WDT_BCM6345) += bcm6345_wdt.o
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obj-$(CONFIG_WDT_BOOKE) += booke_wdt.o
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obj-$(CONFIG_WDT_CORTINA) += cortina_wdt.o
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obj-$(CONFIG_WDT_ORION) += orion_wdt.o
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obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o
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obj-$(CONFIG_WDT_GPIO) += gpio_wdt.o
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obj-$(CONFIG_WDT_MPC8xx) += mpc8xx_wdt.o
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obj-$(CONFIG_WDT_MT7620) += mt7620_wdt.o
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obj-$(CONFIG_WDT_MT7621) += mt7621_wdt.o
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obj-$(CONFIG_WDT_MTK) += mtk_wdt.o
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obj-$(CONFIG_WDT_OCTEONTX) += octeontx_wdt.o
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obj-$(CONFIG_WDT_OMAP3) += omap_wdt.o
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obj-$(CONFIG_WDT_SBSA) += sbsa_gwdt.o
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obj-$(CONFIG_WDT_K3_RTI) += rti_wdt.o
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obj-$(CONFIG_WDT_SP805) += sp805_wdt.o
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obj-$(CONFIG_WDT_STM32MP) += stm32mp_wdt.o
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obj-$(CONFIG_WDT_TANGIER) += tangier_wdt.o
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obj-$(CONFIG_WDT_XILINX) += xilinx_wwdt.o
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