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[3/4] arm64: dts: qcom: sc8280xp-x13s: describe uefi rtc offset

Message ID 20250423075143.11157-4-johan+linaro@kernel.org
State Handled Elsewhere
Headers show
Series rtc: pm8xxx: fix uefi offset lookup | expand

Commit Message

Johan Hovold April 23, 2025, 7:51 a.m. UTC 
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: 409803681a55 ("arm64: dts: qcom: sc8280xp-x13s: switch to uefi rtc offset")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
index 8000254f4db5..66c39765225f 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
+++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
@@ -1090,6 +1090,8 @@  &pmk8280_pon_resin {
 };
 
 &pmk8280_rtc {
+	qcom,uefi-rtc-info;
+
 	status = "okay";
 };