Re: [PATCH 1/3] dt-bindings: rtc: Add Raspberry Pi 5 RTC binding
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
Date: 2026-09-09 15:15:07
Also in:
linux-devicetree
On 09/09/2026 16:12:58+0200, Sander Speetjens wrote:
quoted hunk ↗ jump to hunk
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.yamldiff --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:
This should probably be trickle-voltage-millivolt
+ 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-- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com