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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-67b88a4d99esm3109690a12.31.2026.05.04.01.04.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 04 May 2026 01:04:41 -0700 (PDT) Message-ID: Date: Mon, 4 May 2026 10:04:38 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp-blackrock: switch to uefi rtc offset To: jens.glathe@oldschoolsolutions.biz, Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold References: <20260501-blackrock-rtc-v1-1-bddf3e37fa94@oldschoolsolutions.biz> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260501-blackrock-rtc-v1-1-bddf3e37fa94@oldschoolsolutions.biz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: cnFTTZ5d5ZfM5VRWLYeKMLRqEXZgMavp X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA0MDA4NiBTYWx0ZWRfX8N6ZhtVjflBg 7ZvpornZsNCn6yVNTOdc2ASGN99ovqyHV3zlOhLdV1KY5UTyQHhTAc8H3aWnU7E7eWLiemTw5kH S8h/lxiQcSSx2hXPdjmmJOIY4AZXtPVGkAQVbmFyQE8hFgMqprzMf9NkTEi6IOWWHOnbVEwl07g MpxBfE/bQtd+TEwT0W2h3UvtEnDJGJboI8Jmgaa//5/BcyL5QKhK3a9hw2KRJ5nYziIrIdAKYSO Mg3OPPDIYUAW71B9PNhruye8WHh6m9gHV92dcphnpQtaW+Y6/MxAQ9Ktpzd62iycdOUP8EMD5is NLXrl4NLtu3G33YcalY+OUExVujlYcmnO4SjnraNlS9/vK+MIiSrSozvec588aQNXVrtJdGChpF c7Dk3tDTwQZ83mZ8KS6CrvEbp9BmCcfpghwxqMUs64WpDQ4IkCnjjV5vZE8DoJJkfySfNi8698T RZHZ2zCLYFvRMlkooRQ== X-Authority-Analysis: v=2.4 cv=csirVV4i c=1 sm=1 tr=0 ts=69f8531b cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=gxl3bz0cAAAA:8 a=EUspDBNiAAAA:8 a=VL2iTB8cqDA4uMkxVQgA:9 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 a=kiRiLd-pWN9FGgpmzFdl:22 X-Proofpoint-ORIG-GUID: cnFTTZ5d5ZfM5VRWLYeKMLRqEXZgMavp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-04_03,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1015 phishscore=0 bulkscore=0 impostorscore=0 suspectscore=0 adultscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605040086 On 5/1/26 11:11 AM, Jens Glathe via B4 Relay wrote: > From: Jens Glathe > > 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. > > [1]: https://lore.kernel.org/r/20250423075143.11157-4-johan+linaro@kernel.org > > Fixes: 16a7fed11714 ("arm64: dts: qcom: sc8280xp-blackrock: dt definition for WDK2023") > > Signed-off-by: Jens Glathe > --- Reviewed-by: Konrad Dybcio Konrad