arm64: dts: qcom: sc8280xp-x13s: describe uefi rtc offset

On many Qualcomm platforms the PMIC RTC control and time registers are
read-only so that the RTC time can not be updated. Instead an offset
needs be stored in some machine-specific non-volatile memory, which a
driver can take into account.

On platforms where the offset is stored in a Qualcomm specific UEFI
variable the variables are also accessed in a non-standard way, which
means that the OS cannot assume that the variable service is available
by the time the RTC driver probes.

Use the new 'qcom,uefi-rtc-info' property to indicate that the offset is
stored in a UEFI variable so that the OS can determine whether to wait
for it to become available.

Fixes: 409803681a ("arm64: dts: qcom: sc8280xp-x13s: switch to uefi rtc offset")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20250423075143.11157-4-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

This commit is contained in:

Johan Hovold

2025-04-23 09:51:42 +02:00

committed by

Bjorn Andersson

parent 19272b37aa

commit 869971de82

1 changed files with 2 additions and 0 deletions

									
										arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
									
		+2
		
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				@@ -1090,6 +1090,8 @@

				};

				&pmk8280_rtc {

					qcom,uefi-rtc-info;

					status = "okay";

				};