arm64: dts: qcom: x1e80100: 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: b53c2c23d3 ("arm64: dts: qcom: x1e80100: enable rtc")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20250423075143.11157-5-johan+linaro@kernel.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

This commit is contained in:

Johan Hovold

2025-04-23 09:51:43 +02:00

committed by

Bjorn Andersson

parent 869971de82

commit e8d3dc45f2

1 changed files with 1 additions and 0 deletions

									
										arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi
									
		+1
		
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				@@ -224,6 +224,7 @@

							reg-names = "rtc", "alarm";

							interrupts = <0x0 0x62 0x1 IRQ_TYPE_EDGE_RISING>;

							qcom,no-alarm; /* alarm owned by ADSP */

							qcom,uefi-rtc-info;

						};

						pmk8550_sdam_2: nvram@7100 {