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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ae353c6bb5csm1067844166b.112.2025.07.02.05.59.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Jul 2025 05:59:11 -0700 (PDT) Message-ID: <96073931-644c-4d77-9c61-45ec65adf928@oss.qualcomm.com> Date: Wed, 2 Jul 2025 14:59:09 +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 3/7] arm64: dts: qcom: ipq6018: Add the IMEM node To: Kathiravan Thirumoorthy , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250702-imem-v1-0-12d49b1ceff0@oss.qualcomm.com> <20250702-imem-v1-3-12d49b1ceff0@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20250702-imem-v1-3-12d49b1ceff0@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzAyMDEwNSBTYWx0ZWRfX9Smrkgy50pfU 6sMcWoZAmwe7EnEbALoQhvlFImBoafqFyGeLxYRd++4fxVHBek70N88AiPHqoZsgjD4W7QvlDvO Z+F7dnD/TT3w4g6CpK84WLRhyGXtRxCGpenQdrIoI4lvsTVxTSxj2WguulNATwYdmrhtVjuWgox 7sOe4xWIZYpJ5Sejk7shq+z6yADTRPoDVdLSAwNlqc1imac9OatD/ESeArD/7pVFy5oRRQX6dgM fM7khCpPyl7OqkqhfZbm4fAiJuKJMhBdtmjYr3vKW6lq2aYE4l1CsaiyX9k4bHhqjXvYi4GuGd/ yKYeLikUils82HEg3CudSJAAFopj6bccdJujoKkG1S7N6JSdWdWhl0RPkCJa6qlW1HixZQzjrBX DGK/bTcrdXazILzxg0KWXnP1UAPUnrIFBe6WtBmrUOdtKd9hTewPCQLqXHRM011+3lQBDipl X-Authority-Analysis: v=2.4 cv=EbvIQOmC c=1 sm=1 tr=0 ts=68652d21 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=EUspDBNiAAAA:8 a=o4o9nyK-Q1O9M6IKefoA:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-ORIG-GUID: f7LHCD3_VvV5C5iW3D1NrGTlTLgjKPOn X-Proofpoint-GUID: f7LHCD3_VvV5C5iW3D1NrGTlTLgjKPOn X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-02_01,2025-07-02_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxscore=0 priorityscore=1501 mlxlogscore=869 lowpriorityscore=0 malwarescore=0 adultscore=0 clxscore=1015 bulkscore=0 impostorscore=0 spamscore=0 suspectscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507020105 On 7/2/25 12:17 PM, Kathiravan Thirumoorthy wrote: > Add the IMEM node to the device tree to extract debugging information > like system restart reason, which is populated via IMEM. Define the > IMEM region to enable this functionality. > > As described, overall IMEM region is approximately 32KB but only initial > 4KB is accessible by all masters in the SoC. > > Signed-off-by: Kathiravan Thirumoorthy > --- > arch/arm64/boot/dts/qcom/ipq6018.dtsi | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi > index bfe59b0208415902c69fd0c0c7565d97997d4207..7eca5ba416c2ef5ef1c4e0eb4f58f1ca94fc92f0 100644 > --- a/arch/arm64/boot/dts/qcom/ipq6018.dtsi > +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi > @@ -659,6 +659,15 @@ qpic_nand: nand-controller@79b0000 { > status = "disabled"; > }; > > + sram@8600000 { > + compatible = "qcom,ipq6018-imem", "syscon", "simple-mfd"; > + reg = <0 0x08600000 0 0x7fff>; > + ranges = <0 0 0x08600000 0x7fff>; I firmly believe there's an off-by-one in the docs and there isn't an odd number of bytes reserved in the hw Konrad