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Tue, 14 Jul 2026 07:03:50 -0700 (PDT) X-Received: by 2002:a17:903:4b2b:b0:2cc:76fd:6537 with SMTP id d9443c01a7336-2ce9e7a53edmr128278185ad.2.1784037830258; Tue, 14 Jul 2026 07:03:50 -0700 (PDT) Received: from [192.168.0.116] ([124.123.151.85]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ccc9bf737bsm116115135ad.19.2026.07.14.07.03.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Jul 2026 07:03:49 -0700 (PDT) Message-ID: <3a32a44d-4044-4270-beec-565171ad4bff@oss.qualcomm.com> Date: Tue, 14 Jul 2026 19:33:42 +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 1/2] dt-bindings: net: qcom,bam-dmux: Add qcom,shikra-bam-dmux compatible To: Stephan Gerhold Cc: Stephan Gerhold , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Loic Poulain , Sergey Ryazanov , Johannes Berg , linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, chris.lew@oss.qualcomm.com, Deepak Kumar Singh , Konrad Dybcio References: <20260714-qcom-bam-dmux-vmid-ext-v1-0-3f29da7cca76@oss.qualcomm.com> <20260714-qcom-bam-dmux-vmid-ext-v1-1-3f29da7cca76@oss.qualcomm.com> Content-Language: en-US From: Vishnu Santhosh In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE0MDE0NiBTYWx0ZWRfX/6PLHYKN/Brc ohiTh1+iz6ReXK0fcBnDyXNPhIzouxVSEptKyBdH0qMIg5QoQh11fFC1RDrJBdoDBDy0vblhyyb nlX4Bdc6JzXawFPOuLFoZmf66aQ5c8Y= X-Proofpoint-GUID: BMG6E-HGS9SLWj4Ug8h__yfisp7fdqXH X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE0MDE0NiBTYWx0ZWRfX1/BYaPSIf7kA 2Nw/RAbO5b6jLYKfdu4cWdmZsYQtgMM4FsjiKUWbztIpvsQ0rEoBs2I87gaxcmOmsbgMzAk2Jcd lLPswMoOeLrBbOvq09cHUjGt1Kfg172hiJI7Hos6Kr50ups1Z/joOEOiK3qsGvkV8LMnolCLb+K gKvTXh+tfaTd5DaE2LmX89io9dlaNh89wyRC6W7a8BVZvnyZ+j/GEVVunEF8sVHTg8Sb/4r3cKM 1qVz1enozLDWdEAOiJF3DqMXFoj8dS3XDfCaLUkvwWUyu51gcjBhJ94vNmAfaX0DEhGimoVJa/c 0ugXTtKFZUHZ3fzUvwDSKVslbbWmR9lC7Xu/guTRYHOfUqZhUjhXiEHq7tq4k1kZ7aIPkkVnZH4 Y0cxI/aNHn0bdaNAvqdHmIirqv3PYVoYRDke9Un7/faq95WfB3WuTMd1p2WXegJ5vMGRGvV6S0j SpiMC/9RBYM70c2QOLA== X-Authority-Analysis: v=2.4 cv=PZLPQChd c=1 sm=1 tr=0 ts=6a5641c7 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=ziBI+Y3eO/H+UwYWWny9Hg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=EUspDBNiAAAA:8 a=eaiSrzzrrFeZcQZn5FsA:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-ORIG-GUID: BMG6E-HGS9SLWj4Ug8h__yfisp7fdqXH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-14_03,2026-07-10_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 clxscore=1015 impostorscore=0 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607140146 On 14-07-2026 12:41 pm, Stephan Gerhold wrote: > On Tue, Jul 14, 2026 at 11:02:31AM +0530, Vishnu Santhosh wrote: >> On platforms where the modem DMAs into the BAM-DMUX RX data buffers and >> the XPU enforces per-region access control, each individually >> DMA-mapped RX buffer consumes an XPU resource group. With only ~16 >> groups available, the per-buffer mappings exhaust the table and inbound >> transfers fault. >> >> Add qcom,shikra-bam-dmux as an additional compatible for the Shikra SoC, >> paired with the generic qcom,bam-dmux fallback, so the driver can match >> on it via its of_device_id table. >> >> Co-developed-by: Deepak Kumar Singh >> Signed-off-by: Deepak Kumar Singh >> Signed-off-by: Vishnu Santhosh > IMHO (the DT maintainers might disagree) this is not a different > BAM DMUX hardware block on Shikra, just a different firmware > configuration. I'm sure the existing SoCs also have those XPU blocks, > they just don't make use of it. > > Personally, I would rather describe this with an optional "qcom,vmid" > property similar to your bam-dma patch, allowed for all SoCs. > > Thanks, > Stephan Thanks Stephan. Adding Konrad (Cc), since this compatible-string / match-data approach was his suggestion on an earlier revision of this series send for internal review, specifically because BAM-DMUX is a singleton per SoC. Konrad, given Stephan's point, would you still prefer the compatible-string / match-data approach, or does the optional qcom,vmid property (matching the bam-dma series) make more sense here? Happy to go either way once you've both aligned. Thanks, Vishnu