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47 lines
1.5 KiB
Diff
47 lines
1.5 KiB
Diff
From 4d732f37c30c02d6110622c2a29c4168d840e2f3 Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Fri, 7 Jul 2023 20:16:06 +0100
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Subject: [PATCH 384/697] dt-bindings: rtc: new binding for Raspberry Pi RTC
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driver
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Add binding for the new RTC driver for Raspberry Pi.
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This platform has an RTC managed by firmware, and this RTC
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driver provides the simple mailbox interface to access it.
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Signed-off-by: Dom Cobley <popcornmix@gmail.com>
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dt: bindings: update rpi-rtc binding
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Add property for bcm2712 firmware RTC driver charger control
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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.../devicetree/bindings/rtc/rtc-rpi.txt | 22 +++++++++++++++++++
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1 file changed, 22 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/rtc/rtc-rpi.txt
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/rtc/rtc-rpi.txt
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@@ -0,0 +1,22 @@
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+* Raspberry Pi RTC
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+
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+This is a Linux interface to an RTC managed by firmware, hence it's
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+virtual from a Linux perspective.
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+
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+The interface uses the firmware mailbox api to access the RTC registers.
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+
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+Required properties:
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+compatible: should be "raspberrypi,rpi-rtc"
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+firmware: Reference to the RPi firmware device node.
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+
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+Optional property:
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+trickle-charge-microvolt: specify a trickle charge voltage for the backup
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+ battery in microvolts.
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+
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+Example:
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+
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+ rpi_rtc: rpi_rtc {
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+ compatible = "raspberrypi,rpi-rtc";
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+ firmware = <&firmware>;
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+ trickle-charge-microvolt = <3000000>;
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+ };
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