On Mon, Mar 02, 2020 at 10:04:23PM +0200, Tero Kristo wrote: > 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 Dual license new bindings please: (GPL-2.0-only OR BSD-2-Clause) > +%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: |+ You can drop '|+' as there's no formatting to preserve. > + 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. > + Reference the common watchdog.yaml schema. > +properties: > + compatible: > + enum: > + - ti,rti-wdt Should be SoC specific possibly with a fallback. > + > + 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 { watchdog@... > + compatible = "ti,rti-wdt"; > + reg = <0x0 0x2200000 0x0 0x100>; > + clocks = <&k3_clks 252 1>; > + power-domains = <&k3_pds 252 TI_SCI_PD_EXCLUSIVE>; Not documented. > + assigned-clocks = <&k3_clks 252 1>; > + assigned-clock-parents = <&k3_clks 252 5>; Not documented. > + }; > -- > 2.17.1 > > -- > Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
