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Tue, 20 Oct 2026 22:16:29 -0700 (PDT) Received: from [10.218.31.237] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1903bb7f098sm4812622c88.12.2026.10.20.22.16.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 Oct 2026 22:16:28 -0700 (PDT) Message-ID: <6890be00-889f-4dc8-b532-bbbc1f55c844@oss.qualcomm.com> Date: Wed, 21 Oct 2026 10:46:23 +0530 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: Konrad Dybcio , 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> Content-Language: en-US From: Vishnu Santhosh In-Reply-To: <40657da7-b823-403b-a5d1-ae384db7f3a8@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIxMDAyMCBTYWx0ZWRfX4NoCUysNuhRX fUPpEfZo89wiTUa56JiVQIcf+TkrNMvCTJtwf5ye/T6PErlBDz66NlUlyIfS1sbQXYmVBVOdbkG KP3+oQ+pl+CT1700Wo0Ev40xfqA0TVQ= X-Proofpoint-ORIG-GUID: m-iYZNG4iTbGNu0GTnKKqn9-BWMpUdLq X-Proofpoint-GUID: m-iYZNG4iTbGNu0GTnKKqn9-BWMpUdLq X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIxMDAyMCBTYWx0ZWRfX//vRbWPz9nH4 DNA/LKvGwWbWenNiTazEXgsIDKTOrAuiK3dhs7JLPykp6qZ4g8FNVAo3Dj9FUcC0rfZfoqi/HnC nkGLawVgwEPTyvv4qphr1w2ieOwm3vIydthbs1NfejmlCVL7AWU0wpY4rfnpnBOIU4LhsXdaXqw 6htQWXmAEBsWeuV5j4eh5I4pfrAhgAkOvvlpihRigukij6EoFXP9vF2iDDcrnG1VZ6Pa3bBTYN5 jgxaqBOugseJoQXJSCOL9ulv3EZDUiTfZx2PQxFh1ZRJgQ64TFDH97qhKDvDZPW/Dj7J91ejA8I tra8rCYnIxtdIJt7qxznB293NNrv36Ra6eYjhVUyhj5qs6hqyr7r4Qnjs14UZlBQzUHq1fyZn0x Rru45sk/zUPHbQdgdj0Lg51luYNH3gtTrKpYoeEtBwIqZz/Bxzzr8X1VM2bukjVg0Bp+scyMNs2 dRMK6h6FpKWwIdc30Jw== X-Authority-Analysis: v=2.4 cv=NLpAaE6g c=1 sm=1 tr=0 ts=6ad84aaf cx=c_pps a=cFYjgdjTJScbgFmBucgdfQ==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=9kQE3MI3eT2Opoapha8A:9 a=QEXdDO2ut3YA:10 a=scEy_gLbYbu1JhEsrz4S:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-21_01,2026-10-19_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 impostorscore=0 phishscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610210020 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. > >> + apps_smsm: apps@0 { >> + reg = <0>; >> + #qcom,smem-state-cells = <1>; >> + }; >> + modem_smsm: modem@1 { >> + reg = <1>; >> + interrupts = ; >> + interrupt-controller; >> + #interrupt-cells = <2>; >> + }; > Please retain a newline between each subnode and between the last property > and the first subnode ok. I will fix in next revision. > >> + }; >> + >> soc: soc@0 { >> compatible = "simple-bus"; >> >> @@ -1866,6 +1891,20 @@ glink-edge { >> qcom,remote-pid = <1>; >> label = "mpss"; >> }; >> + >> + bam_dmux: bam-dmux { > Nodes should be sorted within their scope ok. I will fix in next revision. > >> + compatible = "qcom,bam-dmux"; >> + interrupt-parent = <&modem_smsm>; >> + interrupts = <1 IRQ_TYPE_EDGE_BOTH>, >> + <11 IRQ_TYPE_EDGE_BOTH>; > interrupts-extended = <&foo bar baz> ok. I will fix in next revision. >> + interrupt-names = "pc", "pc-ack"; >> + qcom,smem-states = <&apps_smsm 1>, <&apps_smsm 11>; >> + qcom,smem-state-names = "pc", "pc-ack"; > 1 entry a line, please > > [...] ok. I will fix in next revision. > >> base-commit: 518e5b794c06c0f0eb40df3e202274a66202c137 >> change-id: 20260603-qcom-shikra-dts-bam-dmux-7fdcbb6fb662 >> prerequisite-message-id: 20260908-shikra-pas-bam-dmux-binding-v4-1-6044889e7e3d@oss.qualcomm.com >> prerequisite-patch-id: c3d19e8dbf9451f9f8155c86c21a4e6b5dc796d0 >> prerequisite-message-id: 20260920-qcom-bam-dma-vmid-ext-v2-1-4dbbff0e57c8@oss.qualcomm.com >> prerequisite-patch-id: 30840b157a197cc896556c0152b26a00abba0010 >> prerequisite-message-id: 20260920-qcom-bam-dmux-vmid-ext-v2-0-ef5ca2178378@oss.qualcomm.com >> prerequisite-patch-id: a9c2ce26fabf293f94f384409991f8a9b3afaafa >> prerequisite-patch-id: c4d2876bea87e825468eb3bd116bfdf5a203f7c1 > This list screams ""can't merge this patch"". Please either send changes > in a series or hold off until the dependencies are met. > > Konrad Understood. Vishnu