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Thu, 22 Oct 2026 01:48:31 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c468a1ef356sm83697866b.9.2026.10.22.01.48.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Oct 2026 01:48:30 -0700 (PDT) Message-ID: Date: Thu, 22 Oct 2026 10:48:27 +0200 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] arm64: dts: qcom: shikra: Add BAM-DMUX support To: Vishnu Santhosh , 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, stephan@gerhold.net, Deepak Kumar Singh References: <20260920-qcom-shikra-dts-bam-dmux-v3-1-91474d507d61@oss.qualcomm.com> <40657da7-b823-403b-a5d1-ae384db7f3a8@oss.qualcomm.com> <6890be00-889f-4dc8-b532-bbbc1f55c844@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <6890be00-889f-4dc8-b532-bbbc1f55c844@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: Wqa3ep7y64O5xvOKgr0R5X8ERDfGC40y X-Proofpoint-ORIG-GUID: Wqa3ep7y64O5xvOKgr0R5X8ERDfGC40y X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIyMDAzNCBTYWx0ZWRfXwBxeuMCRCMTY 2wxrwMLRMYQRUwrCFMh+tvYQYYOJnWsvwT0EHF6ivWJECG61HCLAl6/qRyeg4CTEwQ/s2RlUxLG z8uppIecWZ1sRg65Mgy3pbf6gNYfN9U= X-Authority-Analysis: v=2.4 cv=G4OJgNk5 c=1 sm=1 tr=0 ts=6ad9cde0 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=XdfhtzbLNWwZdSUk0-cA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIyMDAzNCBTYWx0ZWRfX+0BubsyfQl21 cK/L6tCFZLcYNmlsmVnP2niyw62+wZ+qkNgv9w57NySLEua06hWUPORmhDyCDfCB+GvGpRY4Nka ixuehUWiLzFwxXuKeA47Sc/PED5hMc+BACUmbE2A1zvLzb14DtXdYCfYTXQllMVXaEeuOx4Gtk2 TwE87E7aQXvIg1Hu/SnCpu2aiQqMOmbvGdd3jh2YJn0rnwLs4DIjnZF2wFGZw3j2GQUH/K2eYMr 8f0VN1h7OgYh9fixPv7oIeiRDgA12zfPdSMmCa41zBkDFJdI9Ds6W7g4br5SIVZWJLz6sbfVeQO cvrnqeY+2FvRNHJxwbm7l9+dZNnWk1uIu9DTaqH199xRX77CvXkicQx/Xe+Q7gT2xJhNKSSHTbE T1yyIkkRTg0QfSe5q7SeF34URKUg+7dwSk541xc7CnrGmhfjw9Bh776mAp/vqZ95h2aEd7dU5cC Qxue7Lz10r3tuX2hQbA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-22_03,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 adultscore=0 malwarescore=0 spamscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610220034 On 10/21/26 7:16 AM, Vishnu Santhosh wrote: > > On 15-10-2026 02:52 pm, Konrad Dybcio wrote: >> On 9/20/26 5:28 AM, Vishnu Santhosh wrote: >>> Add the SMSM state entries, BAM-DMUX node, and BAM DMA controller needed >>> to provide modem data channels on Shikra. >>> >>> Reserve a 256 KiB restricted DMA pool and reference it from both the >>> BAM-DMUX and BAM DMA nodes. Set qcom,vmid to NAV so the BAM-DMUX driver >>> can grant the modem access to the complete pool before requesting the DMA >>> channels. >> [...] >> >>> +    smsm { >>> +        compatible = "qcom,smsm"; >>> +        #address-cells = <1>; >>> +        #size-cells = <0>; >>> +        mboxes = <0>, <&apcs_glb 13>; >> Why is there a "null" reference? > > Each mboxes entry is the outgoing doorbell for the SMSM host with the > same index. Index 0 is the apps processor itself (apps@0), which has no > doorbell, so <0> keeps the modem doorbell at index 1. msm8916.dtsi uses > the same layout. Got it, thanks Konrad