u-boot.git/drivers/watchdog, branch v2025.04

Merge https://source.denx.de/u-boot/custodians/u-boot-watchdog

2025-01-09T21:25:36Z

- rti: support SPL (or re-start) (Alexander) - rti: drop hack manipulating WDT clock rate (Alexander)

watchdog: rti: drop hack manipulating WDT clock rate

2025-01-07T09:29:58Z

The hack itself seems to be copied from Linux rti_wdt.c, but the WDT reset principle is different in U-Boot. While Linux relies on correct frequencies and timers and doesn't check the actual WDT counter value U-Boot driver seems to be more robust: it does compare RTIDWDCNTR vs RTIDWDPRLD. Now the root cause of the original motivation to manipulate the clock rate is said to be understood and fixed in Linux commit cae58516534e ("watchdog: rti_wdt: Set min_hw_heartbeat_ms to accommodate a safety margin") which simultaneously removed the hack itself. While is fix part of the mentioned patch is neither applicable nor requried for the U-Boot driver just drop the hack setting WDT clock rate to 90% of the real rate. This has a nice effect that the WDT timeout is now as requested and not 10% shorter. Signed-off-by: Alexander Sverdlin Reviewed-by: Jan Kiszka Reviewed-by: Stefan Roese

watchdog: rti: support SPL (or re-start)

2025-01-07T09:29:58Z

If the RTI watchdog has been enabled in SPL, enabling it in U-Boot proper fails because it can only be enabled once in HW and never stopped. This however leads to a situation that wdt_cyclic() watchdog trigger is not being started any longer and the WDT fires at some point. Allow for WDT re-start by not bailing out if the [previously] configured period matches the one to be configured. Enabling in [A53] SPL has been tested on AM62x-based HW (where [A53] SPL is responsible for loading R5 DM firmware and not this driver). Signed-off-by: Alexander Sverdlin Reviewed-by: Jan Kiszka Reviewed-by: Stefan Roese

wdt: imx8qxp: add option to control external PMIC wdt via IMX8 SCU

2024-11-26T02:07:37Z

Driver for a PMIC watchdog timer controlled via Siemens SCU firmware extensions. Only useful on some Siemens i.MX8-based platforms as special SCFW is needed which provides the needed SCU API. Signed-off-by: Andrej Valek Signed-off-by: Heiko Schocher Reviewed-by: Alexander Sverdlin Reviewed-by: Stefan Roese

watchdog: introduce separate SPL symbol for WDT_GPIO

2024-10-23T05:02:25Z

Currently, enabling WDT_GPIO on a board which uses SPL, but does not have SPL_WDT, SPL_DM_GPIO or SPL_OF_CONTROL enabled, breaks the build. Make it possible to use the WDT_GPIO driver on such boards by introducing a separate symbol controlling whether the driver is built for SPL. Make it default to WDT_GPIO such that boards that already have it enabled and all the SPL prerequisites satisfied will continue to have it in SPL. Signed-off-by: Rasmus Villemoes Reviewed-by: Tom Rini Reviewed-by: Stefan Roese

drivers: watchdog: Add DaVinci's watchdog support

2024-10-23T04:52:38Z

Add support for the DaVinci's watchdog timer Signed-off-by: Bastien Curutchet Reviewed-by: Stefan Roese

watchdog: gpio_wdt: add support for stoppable devices

2024-10-23T04:52:38Z

Back when I added this driver in commit 2ac8490412c9, I wrote 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; That has changed now; I have a board with just such a watchdog on my desk currently. Add support for that. - For a hw_algo="toggle" device, the gpio is requested as output if the always-running flag is set, otherwise as input. - The ->start() method is updated to change the direction to output when required (i.e. it is not always-running). - The ->stop() method is implemented, but of course reports failure if always-running. As I still haven't met any hw_algo="level" devices, I'm not entirely sure how they fit in, but I'm borrowing logic from the corresponding linux driver: - In ->probe(), such devices always request the gpio as GPIOD_IS_OUT. - In ->stop(), the linux driver has an "eternal ping" comment and sets the gpio to (logic) high. Stefan: Added necessary changes in test/dm/wdt.c to fix CI build breakage, as suggested by Rasmus. Signed-off-by: Rasmus Villemoes Reviewed-by: Stefan Roese

Merge patch series "Tidy up use of 'SPL' and CONFIG_SPL_BUILD"

2024-10-11T18:23:25Z

Simon Glass says: When the SPL build-phase was first created it was designed to solve a particular problem (the need to init SDRAM so that U-Boot proper could be loaded). It has since expanded to become an important part of U-Boot, with three phases now present: TPL, VPL and SPL Due to this history, the term 'SPL' is used to mean both a particular phase (the one before U-Boot proper) and all the non-proper phases. This has become confusing. For a similar reason CONFIG_SPL_BUILD is set to 'y' for all 'SPL' phases, not just SPL. So code which can only be compiled for actual SPL, for example, must use something like this: #if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD) In Makefiles we have similar issues. SPL_ has been used as a variable which expands to either SPL_ or nothing, to chose between options like CONFIG_BLK and CONFIG_SPL_BLK. When TPL appeared, a new SPL_TPL variable was created which expanded to 'SPL_', 'TPL_' or nothing. Later it was updated to support 'VPL_' as well. This series starts a change in terminology and usage to resolve the above issues: - The word 'xPL' is used instead of 'SPL' to mean a non-proper build - A new CONFIG_XPL_BUILD define indicates that the current build is an 'xPL' build - The existing CONFIG_SPL_BUILD is changed to mean SPL; it is not now defined for TPL and VPL phases - The existing SPL_ Makefile variable is renamed to SPL_ - The existing SPL_TPL Makefile variable is renamed to PHASE_ It should be noted that xpl_phase() can generally be used instead of the above CONFIGs without a code-space or run-time penalty. This series does not attempt to convert all of U-Boot to use this new terminology but it makes a start. In particular, renaming spl.h and common/spl seems like a bridge too far at this point. The series is fully bisectable. It has also been checked to ensure there are no code-size changes on any commit.

global: Rename SPL_TPL_ to PHASE_

2024-10-11T17:44:48Z

Use PHASE_ as the symbol to select a particular XPL build. This means that SPL_TPL_ is no-longer set. Update the comment in bootstage to refer to this symbol, instead of SPL_ Signed-off-by: Simon Glass

da9063: Add watchdog support

2024-10-04T12:51:39Z

The DA9063 PMIC is a multi-function device that provides regulator, watchdog, RTC, and ON key functionalities. Add support for the DA9063 PMIC watchdog functionality. Based on the 6.11 kernel drivers/watchdog/da9063_wdt.c driver. Signed-off-by: Fabio Estevam Reviewed-by: Stefan Roese