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: b53c2c23d3c2 ("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>

diff --git a/arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi b/arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi
index c02fd4d15c9649c222caaafa5ed2c777a10fb4f5..e3888bc143a0aaae23c92d400d48ea94423e0366 100644 (file)
--- a/arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi
@@ -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 {