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Mon, 02 Feb 2026 04:50:21 -0800 (PST) X-Received: by 2002:a05:6a00:94db:b0:81f:99a4:190 with SMTP id d2e1a72fcca58-823ab643c11mr10652502b3a.7.1770036620571; Mon, 02 Feb 2026 04:50:20 -0800 (PST) Received: from [192.168.1.12] ([122.164.84.27]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82379b1d024sm16258928b3a.12.2026.02.02.04.50.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Feb 2026 04:50:20 -0800 (PST) Message-ID: <24bccc7c-8b86-4c12-a869-49bde7b2e44f@oss.qualcomm.com> Date: Mon, 2 Feb 2026 18:20:13 +0530 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 v6 2/5] arm64: dts: qcom: ipq5424: Add the IMEM node To: Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Wim Van Sebroeck , Guenter Roeck , Rajendra Nayak Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org References: <20260130-wdt_reset_reason-v6-0-417ab789cd97@oss.qualcomm.com> <20260130-wdt_reset_reason-v6-2-417ab789cd97@oss.qualcomm.com> <2a19de94-8a5a-4fd1-b15a-9b76ea5076d9@oss.qualcomm.com> Content-Language: en-US From: Kathiravan Thirumoorthy In-Reply-To: <2a19de94-8a5a-4fd1-b15a-9b76ea5076d9@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=MNltWcZl c=1 sm=1 tr=0 ts=69809d8e cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=0VawqKFGzM+h848LIW4odg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=Im0m2ywfNG4mJcU91AUA:9 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-GUID: fBFGpwb4aXkmtrSsghjgMgbXCBSKrlwM X-Proofpoint-ORIG-GUID: fBFGpwb4aXkmtrSsghjgMgbXCBSKrlwM X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjAyMDA5OSBTYWx0ZWRfX6uaQZfHH5HXp KClOnX1E+kX6JuaR4HUgNyAezvR3iH8cu5B/s4N7YYkH6ruKn6amrWosVAF636Z03pttssLDC8n 9gkXEc6J6Ytgpm4dOC4elDkjq4zhg2reg1EWDgQ9vA9ueaOXpvgHMEwoz3IeY7IUkD2ooq2bWBI vMtLfdQvIZSwLl0s1x7KrZkYCBXJ4wIoGQm5+ab5UttRLv6qOCGVA+UdZ64yPCWXLbsQs3Rp1ek HDs76Rmo3L/pAL7180sIWF2DUYNRMysI4xpjgSzyUpLzg0xORLnOO5OlbHmIBDlhL3gI1pPV47F 1kh/kLojef/gWMPStV91Go+nlKakEmHKosz5oliuWFC3y9YDYYlCFYqGKRfV20JqNThwAK6mrHr /dbgxh8zVsQj1FYj5asmqVHHjkxx2nPN+YncL0NR/9Xfe1ZcfSb8qKCIshFgaTH8qlrllsARgFD D0QaUTqxgmtQAPoGjYg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-02_04,2026-01-30_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 suspectscore=0 adultscore=0 impostorscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 spamscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602020099 On 2/2/2026 5:53 PM, Konrad Dybcio wrote: > On 1/30/26 11:44 AM, 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 112KB but only initial 4KB is >> accessible by all masters in the SoC. >> >> Signed-off-by: Kathiravan Thirumoorthy >> --- >> Changes in v6: >> - move to mmio-sram and drop the Konrad's R-b tag >> Changes in v5: >> - No changes >> Changes in v4: >> - No changes >> Changes in v3: >> - Picked up the R-b tag >> Changes in v2: >> - Describe the entire IMEM region in the node >> - Explicitly call out that initial 4K only accessible by all >> masters in the commit message >> --- >> arch/arm64/boot/dts/qcom/ipq5424.dtsi | 9 +++++++++ >> 1 file changed, 9 insertions(+) >> >> diff --git a/arch/arm64/boot/dts/qcom/ipq5424.dtsi b/arch/arm64/boot/dts/qcom/ipq5424.dtsi >> index eb393f3fd728f0b2fc8cd93c849f8c170d76e312..90790f99f0597b63801d4e07b9b72cd372ad46d4 100644 >> --- a/arch/arm64/boot/dts/qcom/ipq5424.dtsi >> +++ b/arch/arm64/boot/dts/qcom/ipq5424.dtsi >> @@ -697,6 +697,15 @@ ssphy_0: phy@7d000 { >> status = "disabled"; >> }; >> >> + sram@8600000 { >> + compatible = "qcom,ipq5424-imem", "mmio-sram"; >> + reg = <0 0x08600000 0 0x1c000>; >> + ranges = <0 0 0x08600000 0x1c000>; >> + >> + #address-cells = <1>; >> + #size-cells = <1>; > I think you may need to add 'no-memory-wc' too, in case someone uses > any of the sram functions on this in the future Ack. Let me take care of this in next spin. > > Konrad