linux-kernel - [PATCH 7/7] arm64: dts: qcom: x1e80100: enable rtc

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Message-ID: <20250120144152.11949-8-johan+linaro@kernel.org>
Date: Mon, 20 Jan 2025 15:41:52 +0100
From: Johan Hovold <johan+linaro@...nel.org>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Bjorn Andersson <andersson@...nel.org>
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Jonathan Marek <jonathan@...ek.ca>,
	linux-arm-msm@...r.kernel.org,
	linux-rtc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH 7/7] arm64: dts: qcom: x1e80100: enable rtc

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 X1E based Windows on Arm machines the offset is stored in a Qualcomm
specific UEFI variable.

Unlike on previous platforms the alarm registers are also unaccessible
on X1E as they are owned by the ADSP.

Assume all X1E machines use similar firmware and enable the RTC in the
PMIC dtsi for now.

Based on a patch by Jonathan Marek. [1]

Link: https://lore.kernel.org/r/20241015004945.3676-4-jonathan@marek.ca # [1]
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi b/arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi
index 5b54ee79f048..051fb3a304b9 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1e80100-pmics.dtsi
@@ -223,8 +223,8 @@ pmk8550_rtc: rtc@...0 {
 			reg = <0x6100>, <0x6200>;
 			reg-names = "rtc", "alarm";
 			interrupts = <0x0 0x62 0x1 IRQ_TYPE_EDGE_RISING>;
-			/* Not yet sure what blocks access */
-			status = "reserved";
+			qcom,no-alarm; /* alarm owned by ADSP */
+			qcom,uefi-rtc-info;
 		};
 
 		pmk8550_sdam_2: nvram@...0 {
-- 
2.45.2