From: Drew Fustini <dfustini@baylibre.com>
To: Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Dave Gerlach <d-gerlach@ti.com>, Tony Lindgren <tony@atomide.com>,
Nishanth Menon <nm@ti.com>,
Santosh Shilimkar <ssantosh@kernel.org>
Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Drew Fustini <dfustini@baylibre.com>
Subject: [PATCH v2 1/2] dt-bindings: wkup-m3-ipc: Add vtt toggle gpio pin property
Date: Sat, 9 Apr 2022 14:12:14 -0700 [thread overview]
Message-ID: <20220409211215.2529387-2-dfustini@baylibre.com> (raw)
In-Reply-To: <20220409211215.2529387-1-dfustini@baylibre.com>
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@ti.com>
[dfustini: converted to YAML, removed unnecessary "ti,needs-vtt-toggle"]
Signed-off-by: Drew Fustini <dfustini@baylibre.com>
---
.../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
+
required:
- compatible
- reg
@@ -76,6 +88,7 @@ examples:
interrupts = <78>;
ti,rproc = <&wkup_m3>;
mboxes = <&mailbox &mbox_wkupm3>;
+ ti,vtt-gpio-pin = <7>;
};
};
...
--
2.32.0
next prev parent reply other threads:[~2022-04-09 21:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-09 21:12 [PATCH v2 0/2] soc: ti: wkup_m3_ipc: support vtt toggle Drew Fustini
2022-04-09 21:12 ` Drew Fustini [this message]
2022-04-10 14:17 ` [PATCH v2 1/2] dt-bindings: wkup-m3-ipc: Add vtt toggle gpio pin property Krzysztof Kozlowski
2022-04-12 19:54 ` Rob Herring
2022-04-12 21:15 ` Drew Fustini
2022-04-13 21:48 ` Rob Herring
2022-04-09 21:12 ` [PATCH v2 2/2] soc: ti: wkup_m3_ipc: Add support for toggling VTT regulator Drew Fustini
2022-04-22 23:14 ` (subset) [PATCH v2 0/2] soc: ti: wkup_m3_ipc: support vtt toggle Nishanth Menon
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