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Window watchdog timer(WWDT) contains closed(first) and open(second) window with 32 bit width. Write to the watchdog timer within predefined window periods of time. This means a period that is not too soon and a period that is not too late. Updated devicetree bindings for adding versal window watchdog device. Signed-off-by: Srinivas Neeli --- Changes in V2: - Added watchdog ref - Removed timeout-sec property - Used 4 spaces for example indentation. --- .../bindings/watchdog/xlnx,versal-wwdt.yaml | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml diff --git a/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml new file mode 100644 index 000000000000..733de1ac60e8 --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml @@ -0,0 +1,58 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/watchdog/xlnx,versal-wwdt.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Xilinx Versal window watchdog timer controller + +maintainers: + - Neeli Srinivas + +description: + Versal watchdog driver uses window watchdog mode. Window watchdog + timer(WWDT) contains closed(first) and open(second) window with + 32 bit width. Write to the watchdog timer within predefined window + periods of time. This means a period that is not too soon and a + period that is not too late. The WWDT has to be restarted within + the open window time. If software tries to restart WWDT outside of + the open window time period, it generates a reset. + +allOf: + - $ref: /schemas/watchdog/watchdog.yaml# + +properties: + compatible: + enum: + - xlnx,versal-wwdt + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + xlnx,close_percent: + $ref: "/schemas/types.yaml#/definitions/uint32" + minimum: 1 + maximum: 99 + default: 50 + description: closed window percentage + +required: + - compatible + - reg + - clocks + +unevaluatedProperties: false + +examples: + - | + watchdog@fd4d0000 { + compatible = "xlnx,versal-wwdt"; + reg = <0xfd4d0000 0x10000>; + clocks = <&clock25>; + timeout-sec = <30>; + xlnx,close_percent = <25>; + }; +... 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Signed-off-by: Srinivas Neeli --- MAINTAINERS | 2 ++ 1 file changed, 2 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 7731e3ccac0e..77a8cff9ef03 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -22987,8 +22987,10 @@ M: Srinivas Neeli R: Shubhrajyoti Datta R: Michal Simek S: Maintained +F: Documentation/devicetree/bindings/watchdog/xlnx,versal-wwdt.yaml F: Documentation/devicetree/bindings/watchdog/xlnx,xps-timebase-wdt.yaml F: drivers/watchdog/of_xilinx_wdt.c +F: drivers/watchdog/xilinx_wwdt.c XILINX XDMA DRIVER M: Lizhi Hou