On Tue, Aug 29, 2023 at 9:42 PM Fabio Estevam <festevam@xxxxxxxxx> wrote: > > From: Fabio Estevam <festevam@xxxxxxx> > > Document the critical-action property to describe the thermal action > the OS should perform after the critical temperature is reached. > > The possible values are "shutdown" and "reboot". > > The motivation for introducing the critical-action property is that > different systems may need different thermal actions when the critical > temperature is reached. > > For example, a desktop PC may want the OS to trigger a shutdown > when the critical temperature is reached. > > However, in some embedded cases, such behavior does not suit well, > as the board may be unattended in the field and rebooting may be a > better approach. > > The bootloader may also benefit from this new property as it can check > the SoC temperature and in case the temperature is above the critical > point, it can trigger a shutdown or reboot accordingly. > > Signed-off-by: Fabio Estevam <festevam@xxxxxxx> > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx> > --- > Changes since v4: > - None. > > .../devicetree/bindings/thermal/thermal-zones.yaml | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml > index 4f3acdc4dec0..c2e4d28f885b 100644 > --- a/Documentation/devicetree/bindings/thermal/thermal-zones.yaml > +++ b/Documentation/devicetree/bindings/thermal/thermal-zones.yaml > @@ -75,6 +75,15 @@ patternProperties: > framework and assumes that the thermal sensors in this zone > support interrupts. > > + critical-action: > + $ref: /schemas/types.yaml#/definitions/string > + description: > + The action the OS should perform after the critical temperature is reached. > + > + enum: > + - shutdown > + - reboot > + > thermal-sensors: > $ref: /schemas/types.yaml#/definitions/phandle-array > maxItems: 1 > -- I'm wondering if this should be a bool property called "critical-reboot", say, which when present would mean to carry out a reboot instead of a shutdown in an emergency. As defined above, the "shutdown" value is simply redundant, because the code will effectively convert any other value to "shutdown" anyway.
