From 376eb490c7811b026ebfed32280688620dd1c0ca Mon Sep 17 00:00:00 2001 From: Drew Fustini Date: Sat, 9 Apr 2022 14:12:14 -0700 Subject: [PATCH] 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: Dave Gerlach [dfustini: converted to YAML, removed unnecessary "ti,needs-vtt-toggle"] Signed-off-by: Drew Fustini Reviewed-by: Krzysztof Kozlowski Signed-off-by: Rob Herring Link: https://lore.kernel.org/r/20220409211215.2529387-2-dfustini@baylibre.com --- Documentation/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 d855c01..7f4a75c 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 + required: - compatible - reg @@ -76,6 +88,7 @@ examples: interrupts = <78>; ti,rproc = <&wkup_m3>; mboxes = <&mailbox &mbox_wkupm3>; + ti,vtt-gpio-pin = <7>; }; }; ... -- 2.7.4