watchdog: rti_wdt: Add support for loading firmware
To avoid the need of extra boot scripting on AM65x for loading a
watchdog firmware, add the required rproc init and loading logic for the
first R5F core to the watchdog start handler. In case the R5F cluster is
in lock-step mode, also initialize the second core. The firmware itself
is embedded into U-Boot binary to ease access to it and ensure it is
properly hashed in case of secure boot.
One possible firmware source is https://github.com/siemens/k3-rti-wdt.
The board is responsible for providing the firmware as additional
loadable via the U-Boot fit image. The driver will pick up its location
from /fit-images/k3-rti-wdt-firmware then.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index eaa6f16..7d2d6ea 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -218,6 +218,26 @@
Say Y here if you want to include support for the K3 watchdog
timer (RTI module) available in the K3 generation of processors.
+if WDT_K3_RTI
+
+config WDT_K3_RTI_LOAD_FW
+ bool "Load watchdog firmware"
+ depends on REMOTEPROC
+ help
+ Automatically load the specified firmware image into the MCU R5F
+ core 0. On the AM65x, this firmware is supposed to handle the expiry
+ of the watchdog timer, typically by resetting the system.
+
+config WDT_K3_RTI_FW_FILE
+ string "Watchdog firmware image file"
+ default "k3-rti-wdt.fw"
+ depends on WDT_K3_RTI_LOAD_FW
+ help
+ Firmware image to be embedded into U-Boot and loaded on watchdog
+ start.
+
+endif
+
config WDT_SANDBOX
bool "Enable Watchdog Timer support for Sandbox"
depends on SANDBOX && WDT