From: Andrej Picej <andrej.picej@norik.com>
To: unlisted-recipients:; (no To-header on input)
Cc: andrej.picej@norik.com, support.opensource@diasemi.com,
wim@linux-watchdog.org, linux@roeck-us.net,
linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org,
robh+dt@kernel.org, devicetree@vger.kernel.org,
shawnguo@kernel.org, s.hauer@pengutronix.de,
kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/4] watchdog: da9062: reset board on watchdog timeout
Date: Tue, 30 Nov 2021 14:42:40 +0100 [thread overview]
Message-ID: <20211130134242.3516619-2-andrej.picej@norik.com> (raw)
In-Reply-To: <20211130134242.3516619-1-andrej.picej@norik.com>
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 <andrej.picej@norik.com>
---
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
next prev parent reply other threads:[~2021-11-30 13:43 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-30 13:42 [PATCH v2 1/4] mfd: da9062: make register CONFIG_I writable Andrej Picej
2021-11-30 13:42 ` Andrej Picej [this message]
2021-11-30 13:54 ` [PATCH v2 2/4] watchdog: da9062: reset board on watchdog timeout Andrej Picej
2021-11-30 13:42 ` [PATCH v2 3/4] dt-bindings: watchdog: da9062: add watchdog timeout mode Andrej Picej
2021-11-30 13:54 ` Andrej Picej
2021-11-30 14:32 ` Guenter Roeck
2021-11-30 16:11 ` Adam Thomson
2021-11-30 16:40 ` Guenter Roeck
2021-11-30 17:46 ` Adam Thomson
2021-12-01 6:42 ` Andrej Picej
2021-12-01 7:01 ` Guenter Roeck
2021-12-01 7:05 ` Andrej Picej
2021-11-30 13:42 ` [PATCH v2 4/4] ARM: dts: imx6: phycore-som: set watchdog timeout mode to shutdown Andrej Picej
2021-11-30 13:56 ` Andrej Picej
2021-11-30 14:31 ` Guenter Roeck
2021-11-30 13:49 ` [PATCH v2 1/4] mfd: da9062: make register CONFIG_I writable Andrej Picej
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