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Tue, 28 Apr 2026 07:23:10 -0700 (PDT) Received: from QCOM-eG0v1AUPpu.na.qualcomm.com ([2a01:e0a:830:450:653f:4d28:6a78:a6ca]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bb80ba9b8c8sm107072666b.48.2026.04.28.07.23.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Apr 2026 07:23:09 -0700 (PDT) From: Loic Poulain Subject: [PATCH 0/9] Support for block device NVMEM providers Date: Tue, 28 Apr 2026 16:23:05 +0200 Message-Id: <20260428-block-as-nvmem-v1-0-6ad23e75190a@oss.qualcomm.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAMnC8GkC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDEyML3aSc/ORs3cRi3byy3NRcXZMkYwOLVIuklETLRCWgpoKi1LTMCrC B0bG1tQDuQjwMYAAAAA== X-Change-ID: 20260428-block-as-nvmem-4b308e8bda9a To: Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Jens Axboe , Johannes Berg , Jeff Johnson , Bartosz Golaszewski , Marcel Holtmann , Luiz Augusto von Dentz , Balakrishna Godavarthi , Rocky Liao , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-block@vger.kernel.org, linux-wireless@vger.kernel.org, ath10k@lists.infradead.org, linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, daniel@makrotopia.org, Loic Poulain X-Mailer: b4 0.14.2 X-Authority-Analysis: v=2.4 cv=HbIkiCE8 c=1 sm=1 tr=0 ts=69f0c2cf cx=c_pps a=lkkFf9KBb43tY3aOjL++dA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=VT4XjZGOAAAA:8 a=EUspDBNiAAAA:8 a=d2RCo21-rtVxI0NFAHcA:9 a=QEXdDO2ut3YA:10 a=k4UEASGLJojhI9HsvVT1:22 a=6CpsfURP9XNmmWg3j1mJ:22 X-Proofpoint-ORIG-GUID: Of7oacddRKp1OzyNCa3fdlNPoHIBjKyT X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI4MDEzNiBTYWx0ZWRfX94IxwjjCjpHD k9uAq//dfc9zcurtptt4t6HbieeKNiLHjKLY3s32BeUeaF6EQjMVmkC1q3fCukLVCPdaBGkfaiq igvDD6Bypn326jPfkjbTVy8yHTkG1vfXFSG3fwEsRpZYpBhquvPMDmX3ZO4osoUVFjJnAQKvWY5 vHkBaPn4Ve82+Oyn2H6zEPu0/p8x98N7aCxvH5Bcz4T+v5QdDmTH2Qrpe93FowWxHHpvyRoj4GV ls9TNp4qKANsudO+vApcpMJb3EopGJqEbn1Sxzs9TD69RfFxCkO/dgb9znEJPXN/opXIQa1YhKq 9oqh77NQ1WSpuaDFt/4TAjVlDq8YR73hznWav+oIJQmGHZGm8q8vv3EYI2OtFigXx2w1jocsrPq zSb6fDxycU8oDGQbFX7nxvBJOg31mhknAoIGPYl4Y4mXfXOeZfZJR490PBkk1bpUw9hzwTUlOvL Fb+oIon5aMo98MI6TKg== X-Proofpoint-GUID: Of7oacddRKp1OzyNCa3fdlNPoHIBjKyT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-28_04,2026-04-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 adultscore=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 spamscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604280136 On embedded devices, it is common for factory provisioning to store device-specific information, such as Ethernet or WiFi MAC addresses, in a dedicated area of an eMMC partition. This avoids the need for and additional EEPROM/OTP and leverages the persistence of eMMC. One example is the Arduino UNO-Q, where the WiFi MAC address and the Bluetooth Device address are stored in the eMMC Boot1 partition. Until now, accessing this information required a custom bootloader to read the data and inject it into the Device Tree before handing control over to the kernel. This approach is fragile and leads to device-specific workarounds. Rather than adding a new NVMEM provider specifically to the eMMC subsystem, the new support operates at the block layer, allowing any block device to behave like other non-volatile memories such as EEPROM or OTP. This series builds on earlier work by Daniel Golle that enables block devices to act as NVMEM providers: https://lore.kernel.org/all/6061aa4201030b9bb2f8d03ef32a564fdb786ed1.1709667858.git.daniel@makrotopia.org/ It also introduces an NVMEM layout description for the Arduino UNO-Q, allowing device-specific data stored in the eMMC Boot1 partition to be accessed in a standard way. WiFi and Ethernet already support retrieving MAC addresses from NVMEM. Bluetooth requires similar support, which is also addressed. Note that this is currently limited to eMMC-backed block devices, as only the eMMC core associates a firmware node with the block device (add_disk_fwnode). This can be easily extended in the future to support additional block drivers. Signed-off-by: Loic Poulain --- Daniel Golle (1): block: implement NVMEM provider Loic Poulain (8): dt-bindings: mmc: Document support for nvmem-layout arm64: dts: qcom: arduino-imola: Describe boot1 NVMEM layout dt-bindings: net: wireless: qcom,ath10k: Add NVMEM MAC address cell arm64: dts: qcom: arduino-imola: Get WiFi MAC from NVMEM dt-bindings: bluetooth: qcom: Add NVMEM BD address cell Bluetooth: hci_sync: Add NVMEM-backed BD address retrieval Bluetooth: qca: Set NVMEM BD address quirks when address is invalid arm64: dts: qcom: arduino-imola: Get Bluetooth BD address from NVMEM .../devicetree/bindings/mmc/mmc-card.yaml | 20 +++ .../net/bluetooth/qcom,bluetooth-common.yaml | 10 ++ .../bindings/net/wireless/qcom,ath10k.yaml | 10 ++ arch/arm64/boot/dts/qcom/qrb2210-arduino-imola.dts | 30 ++++ block/Kconfig | 9 ++ block/Makefile | 1 + block/blk-nvmem.c | 164 +++++++++++++++++++++ drivers/bluetooth/btqca.c | 5 +- include/net/bluetooth/hci.h | 18 +++ net/bluetooth/hci_sync.c | 56 ++++++- 10 files changed, 321 insertions(+), 2 deletions(-) --- base-commit: 47c4835fc0fed583d01d90387b67633950eba2b2 change-id: 20260428-block-as-nvmem-4b308e8bda9a Best regards, -- Loic Poulain