Some Renesas SoCs do not have a reset register and the only way to do a SW controlled reset is to use the watchdog timer.
Additionally, since all the WDT timeout options are so quick, a system reset is about the only thing it's good for. For example, the longest WDT overflow you can get with a RZ/A1 (R7S72100) with its 8-bit wide counter is 125ms. v2: * added to renesas-wdt.txt instead of creating a new file * changed "renesas,r7s72100-reset" to "renesas,r7s72100-wdt" * changed "renesas,wdt-reset" to "renesas,rza-wdt" * added "renesas,rza-wdt" as a fallback * added interupt property (even though it is not used) * added clocks property * changed hard coded register values to defines * added msleep to while(1) loop * removed unnecessary #include files * added Reviewed-by: Geert Uytterhoeven for renesas-reset.c Chris Brandt (3): power: reset: Add Renesas reset driver watchdog: renesas-wdt: add support for rza ARM: dts: r7s72100: Add reset handler .../devicetree/bindings/watchdog/renesas-wdt.txt | 4 +- arch/arm/boot/dts/r7s72100.dtsi | 7 ++ drivers/power/reset/Kconfig | 9 ++ drivers/power/reset/Makefile | 1 + drivers/power/reset/renesas-reset.c | 112 +++++++++++++++++++++ 5 files changed, 132 insertions(+), 1 deletion(-) create mode 100644 drivers/power/reset/renesas-reset.c -- 2.10.1
