Re: [PATCH 3/3] arm64: dts: broadcom: Add RTC to Raspberry Pi 5 B
From: Krzysztof Kozlowski <krzk@kernel.org>
Date: 2026-09-09 15:47:48
Also in:
linux-arm-kernel, linux-rtc
On 09/09/2026 16:13, Sander Speetjens wrote:
quoted hunk ↗ jump to hunk
The Raspberry Pi 5 contains a RTC on a custom DA9091 PMIC that is accesed trought the firware mailbox. This so we have a battery backed RTC, so the OS does not need network to get the time. Signed-off-by: Sander Speetjens <redacted> --- arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b-base.dtsi | 7 +++++++ 1 file changed, 7 insertions(+)diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b-base.dtsi b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b-base.dtsi index b7a6bc34ae1a..5a82dd585f32 100644 --- a/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b-base.dtsi +++ b/arch/arm64/boot/dts/broadcom/bcm2712-rpi-5-b-base.dtsi@@ -102,6 +102,13 @@ wl_on_reg: wl-on-reg { startup-delay-us = <150000>; enable-active-high; }; + + rpi_rtc: rpi-rtc {
Node names should be generic. See also an explanation and list of examples (not exhaustive) in DT specification: https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation If you cannot find a name matching your device, please check in kernel sources for similar cases or you can grow the spec (via pull request to DT spec repo).
+ compatible = "raspberrypi,rpi-rtc"; + firmware = <&firmware>; + status = "okay";
Why? Best regards, Krzysztof