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openmptcprouter/6.12/target/linux/bcm27xx/patches-6.12/950-0384-dt-bindings-rtc-new-binding-for-Raspberry-Pi-RTC-dri.patch
Ycarus (Yannick Chabanois) bdb9b0046f Add bcm27xx 6.12 test support
2024-12-20 14:17:26 +01:00

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From 4d732f37c30c02d6110622c2a29c4168d840e2f3 Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Fri, 7 Jul 2023 20:16:06 +0100
Subject: [PATCH 384/697] dt-bindings: rtc: new binding for Raspberry Pi RTC
driver
Add binding for the new RTC driver for Raspberry Pi.
This platform has an RTC managed by firmware, and this RTC
driver provides the simple mailbox interface to access it.
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
dt: bindings: update rpi-rtc binding
Add property for bcm2712 firmware RTC driver charger control
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
---
.../devicetree/bindings/rtc/rtc-rpi.txt | 22 +++++++++++++++++++
1 file changed, 22 insertions(+)
create mode 100644 Documentation/devicetree/bindings/rtc/rtc-rpi.txt
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/rtc-rpi.txt
@@ -0,0 +1,22 @@
+* Raspberry Pi RTC
+
+This is a Linux interface to an RTC managed by firmware, hence it's
+virtual from a Linux perspective.
+
+The interface uses the firmware mailbox api to access the RTC registers.
+
+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>;
+ };