On Sat, Apr 09, 2022 at 02:12:14PM -0700, Drew Fustini wrote: > Document Wakeup M3 IPC property that indicates a GPIO pin is connected > to the enable pin on DDR VTT regulator and can be toggled during low > power mode transitions. > > Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx> > [dfustini: converted to YAML, removed unnecessary "ti,needs-vtt-toggle"] > Signed-off-by: Drew Fustini <dfustini@xxxxxxxxxxxx> > --- > .../devicetree/bindings/soc/ti/wkup-m3-ipc.yaml | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml b/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml > index d855c01ce61c..7f4a75c5fcaa 100644 > --- a/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml > +++ b/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml > @@ -24,6 +24,14 @@ description: |+ > A wkup_m3_ipc device node is used to represent the IPC registers within an > SoC. > > + Support for VTT Toggle > + ================================== > + On some boards like the AM335x EVM-SK and the AM437x GP EVM, a GPIO pin is > + connected to the enable pin on the DDR VTT regulator. This allows the > + regulator to be disabled upon suspend and enabled upon resume. Please note > + that the GPIO pin must be part of the GPIO0 module as only this GPIO module > + is in the wakeup power domain. > + > properties: > compatible: > enum: > @@ -51,6 +59,10 @@ properties: > mbox_wkupm3 child node. > maxItems: 1 > > + ti,vtt-gpio-pin: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: GPIO pin connected to enable pin on VTT regulator Looking at the driver, can't you add 'maximum: 31' here? If so, I can add it when applying. Rob
