[PATCH 1/2] dt-bindings: wkup-m3-ipc: Add ti,scale-data-fw property

From: Drew Fustini
Date: Mon Apr 25 2022 - 01:29:58 EST

From: Dave Gerlach <d-gerlach@xxxxxx>

Add documentation for ti,scale-data-fw property to enable I2C PMIC
voltage scaling during deep sleep. The property contains the name of a
binary file for the CM3 firmware to load.

Based on previous work by Russ Dill.

Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
[dfustini: split from driver patch and convert to json-schema]
Signed-off-by: Drew Fustini <dfustini@xxxxxxxxxxxx>
.../devicetree/bindings/soc/ti/wkup-m3-ipc.yaml | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml b/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml
index 88d690de050c..d2c248d82384 100644
--- a/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml
+++ b/Documentation/devicetree/bindings/soc/ti/wkup-m3-ipc.yaml
@@ -40,6 +40,12 @@ description: |+
override the pin's existing bias (pull-up/pull-down) and value (high/low) when
IO isolation is active.

+ Support for I2C PMIC Voltage Scaling
+ ====================================
+ It is possible to pass the name of a binary file to load into the CM3 memory.
+ The binary data is the I2C sequences for the CM3 to send out to the PMIC
+ during low power mode entry.
@@ -67,6 +73,11 @@ properties:
mbox_wkupm3 child node.
maxItems: 1

+ ti,scale-data-fw:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ Name of the firmware binary in /lib/firmware to copy to CM3 aux data
$ref: /schemas/types.yaml#/definitions/uint32
description: GPIO pin connected to enable pin on VTT regulator