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

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Message-ID: <3b085773-bc6e-4d03-a9f0-8f8444bdbd45@oss.qualcomm.com>
Date: Thu, 23 Jan 2025 13:26:41 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Johan Hovold <johan+linaro@...nel.org>,
        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
Subject: Re: [PATCH 7/7] arm64: dts: qcom: x1e80100: enable rtc

On 20.01.2025 3:41 PM, Johan Hovold wrote:
> 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>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad