linux-kernel - [PATCH 1/4] dt-bindings: mfd: netronix,ntxec: add reference to power-supply

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Message-Id: <20260102-kobo-aura-battery-v1-1-501f2a8fa575@jm0.eu>
Date: Fri, 02 Jan 2026 19:00:30 +0100
From: Josua Mayer <josua.mayer@....eu>
To: Jonathan Neuschäfer <j.neuschaefer@....net>, 
 Lee Jones <lee@...nel.org>, Sebastian Reichel <sre@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
 devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, Josua Mayer <josua.mayer@....eu>
Subject: [PATCH 1/4] dt-bindings: mfd: netronix,ntxec: add reference to
 power-supply

The Netronix Embedded Controller supports monitoring of battery voltage.

Voltage monitoring functionality is self-contained and requires no
supply- or battery-specific runtime configuration.

Battery design characteristics (e.g. voltage-min-design-microvolt) are
useful for users to understand the charge level and are commonly
provided by a separate battery node linked with monitored-battery
property.

Add reference to power-supply.yaml so that power-supplies and
monitored-battery properties become available.

Further drop reg property description and replace it with maxItems 1 as
is common for i2c devices with single bus address.

Finally replace additionalProperties with unevaluatedProperties to
allow properties from referenced schemas.

Signed-off-by: Josua Mayer <josua.mayer@....eu>
---
 Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
index 37fbb953ea12..6599dcf0eceb 100644
--- a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
+++ b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
@@ -13,13 +13,15 @@ description: |
   This EC is found in e-book readers of multiple brands (e.g. Kobo, Tolino), and
   is typically implemented as a TI MSP430 microcontroller.
 
+allOf:
+  - $ref: /schemas/power/supply/power-supply.yaml
+
 properties:
   compatible:
     const: netronix,ntxec
 
   reg:
-    items:
-      - description: The I2C address of the EC
+    maxItems: 1
 
   system-power-controller:
     type: boolean
@@ -42,7 +44,7 @@ required:
   - compatible
   - reg
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |
@@ -61,5 +63,6 @@ examples:
                 interrupt-parent = <&gpio4>;
                 interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
                 #pwm-cells = <2>;
+                monitored-battery = <&battery>;
         };
     };

-- 
2.43.0