| Message ID | 20220219215328.485660-3-dfustini@baylibre.com |
|---|---|
| State | New |
| Headers | show |
| Series | soc: ti: wkup_m3_ipc: support vtt toggle, io isolation & voltage scaling | expand |
On 13:53-20220219, Drew Fustini wrote: > From: Dave Gerlach <d-gerlach@ti.com> > > Add description of the wkup_m3_ipc DT properties that can be used to > toggle VTT regulator during low power mode transitions. > > Signed-off-by: Dave Gerlach <d-gerlach@ti.com> > Signed-off-by: Drew Fustini <dfustini@baylibre.com> > --- > .../bindings/soc/ti/wkup_m3_ipc.txt | 34 +++++++++++++++++++ NAK. no more txt files please. convert to yaml prior to adding features. > 1 file changed, 34 insertions(+) > > diff --git a/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt b/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt > index 401550487ed6..4cdbb60fd0d0 100644 > --- a/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt > +++ b/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt > @@ -55,3 +55,37 @@ Example: > ... > }; > }; > + > +Support for VTT Toggle > +================================== > +In order to enable the support for VTT toggle during Suspend/Resume > +sequence needed by some boards (like AM335x EVM-SK & AM437x GP EVM), > +the below DT properties are required. It is possible to toggle VTT > +using one of two methods depending on the SoC being used, either > +GPIO0 toggle (AM335x and AM437x), or any GPIO with DS_PAD_CONFIG > +bits in the control module (AM437x only). > + > +VTT Toggle using GPIO0 > +---------------------------------- > +Supported by: AM335x and AM437x > +Used on: AM335x EVM-SK > + > +Optional properties: > +- ti,needs-vtt-toggle: Indicates that the boards requires VTT toggling > + during suspend/resume. > +- ti,vtt-gpio-pin: Specifies the GPIO0 pin used for VTT toggle. > + > +Important Note: > +- Here it is assumed that VTT Toggle will be done using a pin on GPIO-0 Instance. > + It will not work on any other GPIO using the above properties, regardless of > + which part is being used. > + > +Example: > + wkup_m3_ipc: wkup_m3_ipc@1324 { > + compatible = "ti,am3352-wkup-m3-ipc"; > + ... > + ... > + ti,needs-vtt-toggle; > + ti,vtt-gpio-pin = <7>; > + ... > + }; > -- > 2.32.0 >
diff --git a/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt b/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt index 401550487ed6..4cdbb60fd0d0 100644 --- a/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt +++ b/Documentation/devicetree/bindings/soc/ti/wkup_m3_ipc.txt @@ -55,3 +55,37 @@ Example: ... }; }; + +Support for VTT Toggle +================================== +In order to enable the support for VTT toggle during Suspend/Resume +sequence needed by some boards (like AM335x EVM-SK & AM437x GP EVM), +the below DT properties are required. It is possible to toggle VTT +using one of two methods depending on the SoC being used, either +GPIO0 toggle (AM335x and AM437x), or any GPIO with DS_PAD_CONFIG +bits in the control module (AM437x only). + +VTT Toggle using GPIO0 +---------------------------------- +Supported by: AM335x and AM437x +Used on: AM335x EVM-SK + +Optional properties: +- ti,needs-vtt-toggle: Indicates that the boards requires VTT toggling + during suspend/resume. +- ti,vtt-gpio-pin: Specifies the GPIO0 pin used for VTT toggle. + +Important Note: +- Here it is assumed that VTT Toggle will be done using a pin on GPIO-0 Instance. + It will not work on any other GPIO using the above properties, regardless of + which part is being used. + +Example: + wkup_m3_ipc: wkup_m3_ipc@1324 { + compatible = "ti,am3352-wkup-m3-ipc"; + ... + ... + ti,needs-vtt-toggle; + ti,vtt-gpio-pin = <7>; + ... + };