[PATCH v2 2/4] watchdog: da9062: reset board on watchdog timeout
From: Andrej Picej <hidden>
Date: 2021-11-30 13:43:05
Also in:
linux-devicetree, linux-watchdog, lkml
Subsystem:
dialog semiconductor drivers, the rest, watchdog device drivers · Maintainers:
Support Opensource, Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
Implement a method to change watchdog timeout configuration based on DT
binding ("dlg,wdt-sd"). There is a possibility to change the bahaviour
of watchdog reset. Setting WATCHDOG_SD bit enables SHUTDOWN mode, and
clearing it enables POWERDOWN mode on watchdog timeout.
If no DT binding is specified the WATCHDOG_SD bit stays in default
configuration, not breaking behaviour of devices which might depend on
default fuse configuration.
Note: This patch requires that the config register CONFIG_I is
configured as writable in the da9062 multi function device.
Signed-off-by: Andrej Picej <redacted>
---
drivers/watchdog/da9062_wdt.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
index f02cbd530538..e342e9e50cb1 100644
--- a/drivers/watchdog/da9062_wdt.c
+++ b/drivers/watchdog/da9062_wdt.c@@ -85,8 +85,33 @@ static int da9062_wdt_start(struct watchdog_device *wdd) { struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); unsigned int selector; + unsigned int mask; + u32 val; int ret; + /* Configure what happens on watchdog timeout. Can be specified with + * "dlg,wdt-sd" dt-binding (0 -> POWERDOWN, 1 -> SHUTDOWN). + * If "dlg,wdt-sd" dt-binding is NOT set use the default. + */ + ret = device_property_read_u32(wdd->parent, "dlg,wdt-sd", &val); + if (!ret) { + if (val) + /* Use da9062's SHUTDOWN mode */ + mask = DA9062AA_WATCHDOG_SD_MASK; + else + /* Use da9062's POWERDOWN mode. */ + mask = 0x0; + + ret = regmap_update_bits(wdt->hw->regmap, + DA9062AA_CONFIG_I, + DA9062AA_WATCHDOG_SD_MASK, + mask); + + if (ret) + dev_err(wdt->hw->dev, "failed to set wdt reset mode: %d\n", + ret); + } + selector = da9062_wdt_timeout_to_sel(wdt->wdtdev.timeout); ret = da9062_wdt_update_timeout_register(wdt, selector); if (ret)
--
2.25.1
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