Commit 376eb490 authored by Drew Fustini's avatar Drew Fustini Committed by Rob Herring
Browse files

dt-bindings: wkup-m3-ipc: Add vtt toggle gpio pin property 



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: default avatarDave Gerlach <d-gerlach@ti.com>
[dfustini: converted to YAML, removed unnecessary "ti,needs-vtt-toggle"]
Signed-off-by: default avatarDrew Fustini <dfustini@baylibre.com>
Reviewed-by: default avatarKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220409211215.2529387-2-dfustini@baylibre.com
parent fee6de80

Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml

+13 −0
Original line number Diff line number Diff line
@@ -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



required:

  - compatible

  - reg
@@ -76,6 +88,7 @@ examples: 
           interrupts = <78>;

           ti,rproc = <&wkup_m3>;

           mboxes = <&mailbox &mbox_wkupm3>;

           ti,vtt-gpio-pin = <7>;

        };

    };

...