From 6ca216518eb29d60574d4da4b976f4d5dd93e5a0 Mon Sep 17 00:00:00 2001
From: Jonathan Bell <jonathan@raspberrypi.com>
Date: Mon, 18 Sep 2023 16:33:06 +0100
Subject: [PATCH 0573/1085] dt: bindings: update rpi-rtc binding

Add property for bcm2712 firmware RTC driver charger control

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
---
 Documentation/devicetree/bindings/rtc/rtc-rpi.txt | 5 +++++
 1 file changed, 5 insertions(+)

--- a/Documentation/devicetree/bindings/rtc/rtc-rpi.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-rpi.txt
@@ -9,9 +9,14 @@ Required properties:
 compatible: should be "raspberrypi,rpi-rtc"
 firmware:   Reference to the RPi firmware device node.
 
+Optional property:
+trickle-charge-microvolt: specify a trickle charge voltage for the backup
+                          battery in microvolts.
+
 Example:
 
 	rpi_rtc: rpi_rtc {
 		compatible = "raspberrypi,rpi-rtc";
 		firmware = <&firmware>;
+		trickle-charge-microvolt = <3000000>;
 	};
