[PATCH 1/3] dt-bindings: rtc: Add Raspberry Pi 5 RTC binding
From: Sander Speetjens <hidden>
Date: 2026-09-09 14:13:35
Also in:
linux-devicetree, linux-rtc
Subsystem:
open firmware and flattened device tree bindings, real time clock (rtc) subsystem, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Alexandre Belloni, Linus Torvalds
Add device tree bindings for the Raspberry Pi 5 RTC. Located in a custom DA9091 PMIC and accesed trough the firmware mailbox. Signed-off-by: Sander Speetjens <redacted> Assisted-by: Grok --- .../bindings/rtc/raspberrypi,rtc-rpi.yaml | 48 +++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/rtc/raspberrypi,rtc-rpi.yaml
diff --git a/Documentation/devicetree/bindings/rtc/raspberrypi,rtc-rpi.yaml b/Documentation/devicetree/bindings/rtc/raspberrypi,rtc-rpi.yaml
new file mode 100644
index 000000000000..e9bade7f8c91
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/raspberrypi,rtc-rpi.yaml@@ -0,0 +1,48 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause + +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rtc/raspberrypi,rtc-rpi.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Raspberry Pi firmware RTC + +maintainers: + - Jonathan Bell <jonathan@raspberrypi.com> + +description: | + Raspberry Pi RTC from the DA9091 accessed through the Raspberry Pi firmware + property interface. + +properties: + compatible: + const: raspberrypi,rpi-rtc + + firmware: + $ref: /schemas/types.yaml#/definitions/phandle + description: + Phandle to the Raspberry Pi firmware device. + + trickle-charge-microvolt: + description: + RTC backup battery trickle-charge voltage. A value of 0 disables + trickle charging. + anyOf: + - const: 0 + - minimum: 1300000 + maximum: 4400000 + +required: + - compatible + - firmware + +additionalProperties: false + +examples: + - | + rtc { + compatible = "raspberrypi,rpi-rtc"; + firmware = <&firmware>; + status = "okay"; + trickle-charge-microvolt = <0>; + };
--
2.55.0