linux-kernel - [PATCH v2 1/3] dt-bindings: power: reset: atmel,sama5d2-shdwc: add lpm binding

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Message-ID: <d8fc40a97008cb0b4001684b3c9e1cc4bf3fb706.1758051358.git.Ryan.Wanner@microchip.com>
Date: Tue, 16 Sep 2025 12:50:30 -0700
From: <Ryan.Wanner@...rochip.com>
To: <claudiu.beznea@...on.dev>, <sre@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
	<alexandre.belloni@...tlin.com>, <linux@...linux.org.uk>
CC: <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	Varshini Rajendran <varshini.rajendran@...rochip.com>
Subject: [PATCH v2 1/3] dt-bindings: power: reset: atmel,sama5d2-shdwc: add lpm binding

From: Varshini Rajendran <varshini.rajendran@...rochip.com>

Add microchip,lpm-connection binding which allows to specify the devices
the SHDWC's Low Power Mode pin is connected to.

Signed-off-by: Varshini Rajendran <varshini.rajendran@...rochip.com>
[ryan.wanner@...rochip.com: Add sam9x7-shdwc SoC to properties check]
Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>
---
 .../power/reset/atmel,sama5d2-shdwc.yaml      | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml b/Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml
index 9c34249b2d6d..668b541eb44c 100644
--- a/Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml
+++ b/Documentation/devicetree/bindings/power/reset/atmel,sama5d2-shdwc.yaml
@@ -56,6 +56,13 @@ properties:
     description: enable real-time timer wake-up
     type: boolean
 
+  microchip,lpm-connection:
+    description:
+      List of phandles to devices which are connected to SHDWC's Low Power Mode Pin.
+      The LPM pin is used to idicate to an external power supply or device to enter
+      or exit a special powering state.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+
 patternProperties:
   "^input@[0-15]$":
     description:
@@ -96,6 +103,18 @@ allOf:
       properties:
         atmel,wakeup-rtt-timer: false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - atmel,sama5d2-shdwc
+              - microchip,sam9x60-shdwc
+              - microchip,sam9x7-shdwc
+    then:
+      properties:
+        microchip,lpm-connection: false
+
 additionalProperties: false
 
 examples:
-- 
2.43.0