From a7a3679a148e40879f1ce77580d9edf64cb5b51c Mon Sep 17 00:00:00 2001
From: Jonathan Bell <jonathan@raspberrypi.com>
Date: Mon, 18 Sep 2023 16:33:06 +0100
Subject: [PATCH] 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>;
};