[PATCH v2] kvx: watchdog: Add early watchdog init

[Julian Vetter <jvetter@kalrayinc.com>]

From: Jules Maselbas <jmaselbas@kalray.eu>

Add support for a watchdog that starts as early as possible in barebox.
So, if there is an issue the board is reset properly.

Signed-off-by: Julian Vetter <jvetter@kalrayinc.com>
---
 drivers/watchdog/Kconfig   | 11 +++++++++++
 drivers/watchdog/kvx_wdt.c | 16 ++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 762e37c9c2..71bc7bf0ac 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -89,6 +89,17 @@ config WATCHDOG_KVX
 	help
 	  Add support for the KVX core watchdog.
 
+config WATCHDOG_KVX_EARLY_INIT
+	bool "KVX Core watchdog early init"
+	depends on WATCHDOG_KVX
+	help
+	  Activate the watchdog with early initcall
+
+config WATCHDOG_KVX_EARLY_TIMEOUT
+	int "KVX Core watchdog early timeout in cycles"
+	depends on WATCHDOG_KVX_EARLY_INIT
+	default 100000000
+
 config WATCHDOG_BCM2835
 	bool "Watchdog for BCM283x SoCs"
 	depends on ARCH_BCM283X || COMPILE_TEST
diff --git a/drivers/watchdog/kvx_wdt.c b/drivers/watchdog/kvx_wdt.c
index be6b08b71c..3e66aa38ba 100644
--- a/drivers/watchdog/kvx_wdt.c
+++ b/drivers/watchdog/kvx_wdt.c
@@ -91,3 +91,19 @@ static struct driver kvx_wdt_driver = {
 	.of_compatible	= DRV_OF_COMPAT(kvx_wdt_of_match),
 };
 device_platform_driver(kvx_wdt_driver);
+
+#ifdef CONFIG_WATCHDOG_KVX_EARLY_INIT
+static int kvx_wdt_early_init(void)
+{
+	/* Set Start watchdog counting */
+	kvx_sfr_set(WDV, CONFIG_WATCHDOG_KVX_EARLY_TIMEOUT);
+	kvx_sfr_set(WDR, 0);
+
+	/* Start watchdog counting */
+	kvx_sfr_set_field(TCR, WUI, 1);
+	kvx_sfr_set_field(TCR, WCE, 1);
+
+	return 0;
+}
+core_initcall(kvx_wdt_early_init);
+#endif
-- 
2.34.1