TI K3 SoCs contain an RTI (Real Time Interrupt) module which can be used to implement a windowed watchdog functionality. Windowed watchdog will generate an error if it is petted outside the time window, either too early or too late. Cc: Rob Herring <robh@xxxxxxxxxx> Cc: devicetree@xxxxxxxxxxxxxxx Signed-off-by: Tero Kristo <t-kristo@xxxxxx> --- .../bindings/watchdog/ti,rti-wdt.yaml | 52 +++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml new file mode 100644 index 000000000000..3813f59fb6c3 --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml @@ -0,0 +1,52 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/watchdog/ti,rti-wdt.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Texas Instruments K3 SoC Watchdog Timer + +maintainers: + - Tero Kristo <t-kristo@xxxxxx> + +description: |+ + The TI K3 SoC watchdog timer is implemented via the RTI (Real Time + Interrupt) IP module. This timer adds a support for windowed watchdog + mode, which will signal an error if it is pinged outside the watchdog + time window, meaning either too early or too late. The error signal + generated can be routed to either interrupt a safety controller or + to directly reset the SoC. + +properties: + compatible: + enum: + - ti,rti-wdt + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + +required: + - compatible + - reg + - clocks + +examples: + - | + /* + * RTI WDT in main domain on J721e SoC. Assigned clocks are used to + * select the source clock for the watchdog, forcing it to tick with + * a 32kHz clock in this case. + */ + #include <dt-bindings/soc/ti,sci_pm_domain.h> + + main_rti0: rti@2200000 { + compatible = "ti,rti-wdt"; + reg = <0x0 0x2200000 0x0 0x100>; + clocks = <&k3_clks 252 1>; + power-domains = <&k3_pds 252 TI_SCI_PD_EXCLUSIVE>; + assigned-clocks = <&k3_clks 252 1>; + assigned-clock-parents = <&k3_clks 252 5>; + }; -- 2.17.1 -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
