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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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| .. | ||
| adc | ||
| arm | ||
| ata | ||
| axi | ||
| bus | ||
| clock | ||
| cpu | ||
| exynos | ||
| firmware | ||
| fpga | ||
| fsp/fsp2/apollolake | ||
| gpio | ||
| gpu | ||
| i2c | ||
| input | ||
| interrupt-controller | ||
| leds | ||
| mailbox | ||
| memory | ||
| memory-controller | ||
| memory-controllers | ||
| mfd | ||
| misc | ||
| mmc | ||
| mtd | ||
| nand | ||
| net | ||
| pci | ||
| pci_endpoint | ||
| phy | ||
| pinctrl | ||
| pmic | ||
| power | ||
| pwm | ||
| ram | ||
| reboot-mode | ||
| regulator | ||
| remoteproc | ||
| reserved-memory | ||
| reset | ||
| rtc | ||
| serial | ||
| soc/fsl/cpm_qe/qe | ||
| sound | ||
| spi | ||
| spmi | ||
| sysinfo | ||
| sysreset | ||
| thermal | ||
| timer | ||
| tpm2 | ||
| usb | ||
| video | ||
| w1 | ||
| w1-eeprom | ||
| watchdog | ||
| bootcount-syscon.txt | ||
| chosen.txt | ||
| config.txt | ||
| device.txt | ||
| README | ||
| root.txt | ||
Device Tree Bindings Staging Area ================================= This directory contains device tree bindings for U-Boot. These follow along with Linux kernel bindings, with a few additions. By adding the files here, U-Boot patches can clearly show thees additions. This makes it easier for device tree people to review these additions in patches sent to the U-Boot mailing list. The intent IS to commit these files to U-Boot. Hopefully at some point the files will be stored in another repo (shared with Linux) which is brought in as needed. Changes here are intended to mirror changes in the Linux Documentation/devicetree/bindings/ directory. sjg@chromium.org 17-Jan-12