From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3EA7126658A for ; Wed, 2 Jul 2025 13:00:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751461250; cv=none; b=frit2g1TX+La8xY+kZ1Tf8amr64jnjcdTJoIr3NZYOO8g4aYzUT3VEmF/pQB05Lp4LwJJ4h78VtVoRRwg9OC9Vz6irKtVclerDIIjNBLsMbi2ycdpZkSq7BSX4sWaXGmGhqzUokNOYKCRHTFGbjshqvUrmPsacit75X8q/eLLzU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751461250; c=relaxed/simple; bh=lV32kChCuVqH8yCvDu+qF7ZrBKPBDV6XI5jEvKcTek8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=PQi3YLHB7cqeidwfKnZvFEwuXUYDusBGV/3vQYf8sPa3SpWFLlhl2wiB+j8euZMWKevDZVfoIZQCFrEzsGb4ICUo45/2kROOJPAuDKUjXxk1Cm7n4kJCR1d3pDDS+WTvpviDQDDdPSBzbPS2VR6FuqB0yC2PkoDxgpMw4amBzLI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=fmnZwApL; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="fmnZwApL" Received: from pps.filterd (m0279870.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 562CRXXw018568 for ; Wed, 2 Jul 2025 13:00:48 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= T3NQ7HW39R+Gt0CitY5eJYcMoF47O8lIW9qMV+Vh880=; b=fmnZwApLB40IE3D/ m+ovqXGXHqi0C0RIEETMaMMGq6Ehu0skXl6t3s5SqxkyuDnCa1VAotZDdbzhZouT 0TvVcTJmmnz4gP4gRh9K8kSvaqfKpwA8C+qnPNf8PGjgrSrLkJdo8KMNtdMJFGm7 GzOF24ZKBOd/jrbuazz/xbgal8ae2/zajSeod3v+yd1vFDDxNovhMFnHnQo0JJPK 8k5GmK+F5hZLKeonIzqBql56BE/FzHkwJUovrqHRvX8+wJ0AEz11o3IJ0TdU/8uF R/XavCrjLShOHvx6f4fA8R1jaGYB0J+jG8mMfx3rfg1iSGFR5qftO0uUGRRnr2JA YtHOOQ== Received: from mail-qk1-f197.google.com (mail-qk1-f197.google.com [209.85.222.197]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 47j8fxmrjv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 02 Jul 2025 13:00:48 +0000 (GMT) Received: by mail-qk1-f197.google.com with SMTP id af79cd13be357-7d0979e6263so39372985a.2 for ; Wed, 02 Jul 2025 06:00:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751461247; x=1752066047; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=T3NQ7HW39R+Gt0CitY5eJYcMoF47O8lIW9qMV+Vh880=; b=tXO0Ar/YMqB3fR414KTUMqO/TZRehUml8+PomlZzeES6iT3LKp37ipCQR6xgdmzBLQ OyAzfAHqIQLApFtXipVt+K16a9vAuuy1CKpIhUKYlPHvLpKAKtWMjD0TMCOSBx6/32os iOQhFkLQYf3PT0sTTVHmwzi0sg7Uf5Av8ryEYG3/zAAjThl+2QezbfXmLtcCkaY9Gq4B WKy+aItwKiL/uQGRp+Qe03Z+M0hb+CyMAaD06PVxmEhxp0RLoCprSjsodmwArt2NMKiv fZFsoncGLZTGpRhG76+cFdSNowHmmLMYE0MJbFkOGMeDXt5P4JAev/O1uowLWwKvULWo TFNA== X-Forwarded-Encrypted: i=1; AJvYcCWHBYqEBQ9sgi4z42ui/dULBYl2c8+baOLxaPc7XvPIt0rd2iqqYQbPyQzukxOr2VX1uqN8ccF8sxPAMj4=@vger.kernel.org X-Gm-Message-State: AOJu0Yx0ZJQPkpXBbbBMcrsPKh0SUY+7NWgUdjbKLSxVCwUbC1cFO0R8 /YuPc+vxnTe9nmAUKvYe37IvO5ba9H/4lZTlBhpuEFKp/yDrf+P+OAjafVj+PgMlbEmVIjyoCIT BUCpH0nYTCSDuutqf1RkV9A7NOCWDvLebMW16sel1pQl0x77TGm4LTppI5E3njBGlF88= X-Gm-Gg: ASbGncudvffar5y4aT7C/uoZPcZjAfV1K2FciJufqe3Xd6k4cOGibNDmyuOOd8Whbkd PQEyAHpEPdMX4DfI8gixea0D8XMGVVE1vTDtAj3VS2HzmKKzjFX7H6ZC9BVLrSX8l+1CYgF/AFw zT4uAnbJylrGBBthU7tXlNOhvqDW9ZyUS6PHqcwESEiOV+gxwQUmfLgL4FF5XQEsLL+oMkryFud Rw6XpeG9qUdO8ZQI1a65SSshL768FB1uEMs96JMXMSNI4qfrriBECwW/BCqbIyAH5pl8+CD+0Fx pHIofTFin5i+Ga7XJLWd7FHmXcLNe0TNnNzmRT9Il8Fe1NEMxAhWQupRsitGeVYUUBWOzxQhN+y Pj50= X-Received: by 2002:a05:620a:2552:b0:7d3:f0a1:2f3e with SMTP id af79cd13be357-7d5c464cfeamr150089085a.2.1751461247163; Wed, 02 Jul 2025 06:00:47 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH3/BXMk7FAeZKeLVzLwjtOhnzyC65WEm5pD1H2XXARo1S5Jr0K/z7PoCIEXLabu0cpABZM9w== X-Received: by 2002:a05:620a:2552:b0:7d3:f0a1:2f3e with SMTP id af79cd13be357-7d5c464cfeamr150084285a.2.1751461246447; Wed, 02 Jul 2025 06:00:46 -0700 (PDT) Received: from [192.168.143.225] (078088045245.garwolin.vectranet.pl. [78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ae353c01636sm1079292166b.105.2025.07.02.06.00.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Jul 2025 06:00:45 -0700 (PDT) Message-ID: <0a646e08-8007-4bc0-9324-fa1d40b90d20@oss.qualcomm.com> Date: Wed, 2 Jul 2025 15:00:43 +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: Krzysztof Kozlowski , 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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzAyMDEwNiBTYWx0ZWRfX+WaxJPPfA84i oEQF0dtMyuXgE1x8uvimapJGNATjNmjVRRet1jk94+pCMIhQigfAQBRXc73zeoghsALUNIb/NjM oqJZMkykPJVtbTn2eyfl8E6a8hstKoIWnFR7DHL7NNUEju2jJaHgo6l3eEnyy3imWPtS+Je3TCy rGp4Fi+fVHzuGv+qZlFrCs8FfjCeKqOpIo5ji6qQEmaIpeaZXLf7AnBcOoDVPop6eTT4OQmVZkO nwHewAmqm1K0bXa9uBfjLU93nuMsfTUEw+UBeNTfbJ1s1gUfhYssQHFYluWU6g+UrdiVKEzfs4P i8ZHVKIcAEJeaNvbDK1cVcAVRuOkQPyswtzqyrg3hdwgnkvKED4Yn9rNDEr/g2decfafif6EOAq teAt6DvT2bzPW+fc+3pVaq7wdvVkxmi7ESeqx2oewcNgDhYlz7krbrJ74Dj7DN6O5PYGWrpj X-Proofpoint-GUID: zIEQJPLqfxo7R87W1lBMuR9hq-qgIWHn X-Proofpoint-ORIG-GUID: zIEQJPLqfxo7R87W1lBMuR9hq-qgIWHn X-Authority-Analysis: v=2.4 cv=TqPmhCXh c=1 sm=1 tr=0 ts=68652d80 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=EUspDBNiAAAA:8 a=jZhe5MNW9S75RuEgyRIA:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 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 priorityscore=1501 bulkscore=0 mlxlogscore=983 suspectscore=0 adultscore=0 phishscore=0 malwarescore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 spamscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507020106 On 7/2/25 12:50 PM, Krzysztof Kozlowski wrote: > On 02/07/2025 12:17, 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"; > > No, this is not a simple MFD. Where are any children if this is a MFD? IMEM is just a block of SRAM shared across cores on the platform. It's present on all Qualcomm platforms and usually stores cookies such as reboot reason. A user would be welcome, but I'm not opposed to a lone description either, at it still shrinks the undescribed-reg-space-hole Konrad