On 13/07/2023 11:51, huaqian.li@xxxxxxxxxxx wrote: > From: Li Hua Qian <huaqian.li@xxxxxxxxxxx> > > TI RTI (Real Time Interrupt) Watchdog doesn't support to record the > watchdog cause. Add a reserved memory to know the last reboot was caused > by the watchdog card. In the reserved memory, some specific info will be > saved to indicate whether the watchdog reset was triggered in last > boot. > > Signed-off-by: Li Hua Qian <huaqian.li@xxxxxxxxxxx> > --- > .../devicetree/bindings/watchdog/ti,rti-wdt.yaml | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml > index fc553211e42d..8c16fd3929ec 100644 > --- a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml > +++ b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml > @@ -34,6 +34,18 @@ properties: > power-domains: > maxItems: 1 > > + memory-region: > + maxItems: 1 > + description: > + Contains the watchdog reserved memory. It is optional. > + In the reserved memory, the specified values, which are > + PON_REASON_SOF_NUM(0xBBBBCCCC), PON_REASON_MAGIC_NUM(0xDDDDDDDD), > + and PON_REASON_EOF_NUM(0xCCCCBBBB), are pre-stored at the first > + 3 * 4 bytes to tell that last boot was caused by watchdog reset. > + Once the PON reason is captured by driver(rti_wdt.c), the driver > + is supposed to wipe the whole memory region. > + > + If there is going to be new version, only one blank line, not two. In any case: Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx> Best regards, Krzysztof
