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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> |
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| .. | ||
| armada-37xx-wdt.c | ||
| ast2600_wdt.c | ||
| ast_wdt.c | ||
| at91sam9_wdt.c | ||
| bcm6345_wdt.c | ||
| booke_wdt.c | ||
| cdns_wdt.c | ||
| cortina_wdt.c | ||
| designware_wdt.c | ||
| ftwdt010_wdt.c | ||
| gpio_wdt.c | ||
| imx_watchdog.c | ||
| Kconfig | ||
| Makefile | ||
| mpc8xx_wdt.c | ||
| mt7620_wdt.c | ||
| mt7621_wdt.c | ||
| mtk_wdt.c | ||
| octeontx_wdt.c | ||
| omap_wdt.c | ||
| orion_wdt.c | ||
| rti_wdt.c | ||
| s5p_wdt.c | ||
| sandbox_wdt.c | ||
| sbsa_gwdt.c | ||
| sp805_wdt.c | ||
| stm32mp_wdt.c | ||
| tangier_wdt.c | ||
| ulp_wdog.c | ||
| wdt-uclass.c | ||
| xilinx_tb_wdt.c | ||
| xilinx_wwdt.c | ||