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[199.106.103.52]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b1b24938bdsm1277107a91.1.2026.11.12.23.52.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2026 23:52:41 -0800 (PST) From: Hongmei Xu Subject: [PATCH 0/2] nvmem: Add byte-mask support for non-contiguous byte selection Date: Fri, 13 Nov 2026 15:52:35 +0800 Message-Id: <20261113-nvmem-byte-mask-for-split-macaddr-v1-0-138f715f18c1@oss.qualcomm.com> 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 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAMPB9moC/yXNMQ7CMAxA0atUnrGURFAKV0EMaeKCgaSVHSpQ1 bsTYHzL/wsoCZPCsVlAaGblMVfYTQPh6vOFkGM1OONaa63BPCdK2L8LYfJ6x2EU1OnBpTL4GAX 9tj103rrO7PZQO5PQwK/f43T+W5/9jUL5hmFdP59jq6aFAAAA X-Change-ID: 20261110-nvmem-byte-mask-for-split-macaddr-a4698a128057 To: Srinivas Kandagatla , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?utf-8?q?Rafa=C5=82_Mi=C5=82ecki?= Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Hongmei Xu X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1794556359; l=1807; i=hongmei.xu@oss.qualcomm.com; s=20260917; h=from:subject:message-id; bh=2mY9aI5E1G4zfF2F6CzfWvCpn1twV8Mrl64m5MG9Gys=; b=2mP7NFpsZDCkfE2NIgOC/RzrgW4X2MTp9Rf+ktGnOIK9nP4cyt92QE+C5APjQ5wA8+s87s9zT PayMQYieLo9DIq+TBIHR1/DaMi04f6rm67Schdy0ai+8JaC8skVhC4D X-Developer-Key: i=hongmei.xu@oss.qualcomm.com; a=ed25519; pk=8J3IzbyuOOHSwLvktng8AEQIdStEQDAGNCSOlkASmk4= X-Proofpoint-Spam-Info: AW1haW4tMjYxMTEzMDAzMSBTYWx0ZWRfX2io7ehTA/zZX A9AoJAFbSIlnrBAXB/qH74QKXACYUwr4cCNQEsLrBv2vok/dPF3nVMGTA4wCkRWNX86dj5thNmw oQuCucWm0YzlmS5X6YV4Pjwck+uQo0c= X-Proofpoint-GUID: mZbcHHvll5u0XK7I1vl2K5Gsg7FQopBx X-Authority-Analysis: v=2.4 cv=N+e8hG9B c=1 sm=1 tr=0 ts=6af6c1cb cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=b9+bayejhc3NMeqCNyeLQQ==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=Qa36SSpCRuh_uTHRqdoA:9 a=QEXdDO2ut3YA:10 a=uKXjsCUrEbL0IQVhDsJ9:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTEzMDAzMSBTYWx0ZWRfXw7/svzAu/DTi TIgPKXMhXkwFSHID2VRINg3XUrwapb4qy78l7WIhsUkyPhSKq66+dQwI5Ly7oR7U3y1DRLDbcuh I9sHSgDpiTl7CafXI588ya0LrsR7DyAsex5cRvCOphV7MdhBHfw6Ook9Urv1AMuzb8jDYPLd8Eu k55I43jQVXFKXt6jDdKh4yyIJfMjw2ANeehtFpg627eH2E97S032E0DdZGap/oU8pYaONavgj/f C+7aHkLB0N2S3LzmWXNTokR1C0c5++Yt28DKKF5gS+ACOZ5YxBimA3sQ8TlYoymI++0HydgIU2m OY4uSy/p+sRBAETIAXl7lLHLQtQYkRBSJ71qpsxxTydXZLf3ns+LLwbm/WkBbkB01sxemzkLxlX +UfVnNCS67MyxbMYHDPeDSZFsoS0j5/7b4cTzbxwZ0mSULCEHbrSgRhvlCY7ZK8uEdM66Jf2BoK 7d/40vbfhH0cJsYOgKQ== X-Proofpoint-ORIG-GUID: mZbcHHvll5u0XK7I1vl2K5Gsg7FQopBx 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=2026-11-13_02,2026-11-11_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 malwarescore=0 bulkscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 impostorscore=0 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611130031 Some hardware stores NVMEM cell data in non-contiguous bytes. For example, a MAC address cell may span 7 physical bytes with one byte unused, requiring the driver to skip that byte during readout. The existing 'bits' property only handles sub-byte granularity and cannot express byte-level gaps. This series adds a 'byte-mask' property to the fixed-cell binding and implements it in the nvmem core, allowing consumers to describe and read such cells. An example: assume a MAC address is assembled from efuse registers 0xFFFF4320[31:0] (bytes 0-3), 0xFFFF4324[7:0] (byte 4), and 0xFFFF4324[23:16] (byte 6), with 0xFFFF4324[15:8] unused (byte 5). Map the efuse region as an 8-byte nvmem device and define the cell skipping byte 5: efuse: efuse@ffff4320 { compatible = "..."; reg = <0x0 0xffff4320 0x0 0x8>; #address-cells = <1>; #size-cells = <1>; mac_addr: mac-addr@0 { reg = <0x0 0x6>; byte-mask = <0x5f>; }; }; With byte-mask = 0x5f (0101_1111), bytes 0-4 and 6 are selected (byte 5 is skipped), forming the 6-byte MAC address output. Signed-off-by: Hongmei Xu --- Hongmei Xu (2): dt-bindings: nvmem: add byte-mask property for non-contiguous byte selection nvmem: core: add byte-mask support for non-contiguous cell bytes .../bindings/nvmem/layouts/fixed-cell.yaml | 22 +++++ drivers/nvmem/core.c | 101 +++++++++++++++++++-- include/linux/nvmem-provider.h | 7 ++ 3 files changed, 123 insertions(+), 7 deletions(-) --- base-commit: d26955e57475434b59d43ba372b2a50d33d5e0ed change-id: 20261110-nvmem-byte-mask-for-split-macaddr-a4698a128057 Best regards, -- Hongmei Xu