kernel/Documentation/devicetree/bindings/nvmem/layouts, branch linux-rolling-stable

nvmem: layouts: u-boot-env: add optional "env-size" property

2025-11-24T17:06:22Z

Some devices reserve a larger NVMEM region for the U-Boot environment than the actual environment data length used by U-Boot itself. The CRC32 in the U-Boot header is calculated over the smaller data length, causing CRC validation to fail when Linux reads the full partition. Allow an optional device tree property "env-size" to specify the environment data size to use for CRC computation. v2: add missing $ref line to DT binding Signed-off-by: Jascha Sundaresan Reviewed-by: Rob Herring (Arm) Signed-off-by: Srinivas Kandagatla Link: https://patch.msgid.link/20251114110636.143268-5-srini@kernel.org Signed-off-by: Greg Kroah-Hartman

dt-bindings: nvmem: sl28cpld: add sa67mcu compatible

2025-09-12T13:49:03Z

The Kontron SMARC-sAM67 has the same nvmem layout as the SMARC-sAL28. To To be prepared for any board specific quirks, add a specific compatible. Signed-off-by: Michael Walle Acked-by: Krzysztof Kozlowski Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20250912131415.303407-4-srini@kernel.org Signed-off-by: Greg Kroah-Hartman

dt-bindings: nvmem: fixed-layout: Allow optional bit positions

2025-07-16T12:30:04Z

NVMEM nodes can optionally include the bits property to specify the bit position of the cell within a byte. Extend patternProperties to allow adding the bit offset to the node address to be able to distinguish nodes with the same address but different bit positions, e.g. trim@54,4 { reg = <0x54 1>; bits = <4 2>; }; trim@54,0 { reg = <0x54 1>; bits = <0 4>; }; Before the conversion to NVMEM layouts in commit bd912c991d2e ("dt-bindings: nvmem: layouts: add fixed-layout") this extension was originally added with commit 4b2545dd19ed ("dt-bindings: nvmem: Extend patternProperties to optionally indicate bit position") to the now deprecated layout. Signed-off-by: Sven Peter Reviewed-by: "Rob Herring (Arm)" Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20250712181905.6738-3-srini@kernel.org Signed-off-by: Greg Kroah-Hartman

dt-bindings: nvmem: fixed-cell: increase bits start value to 31

2025-04-11T12:41:21Z

If NVMEM uses a data stride bigger than a byte, the starting bit of the cell might be bigger than a byte (e.g. if the data comes in the second byte of the 4-byte word). Allow the staring bit to be 8 or greater to reflect such usecases. Signed-off-by: Dmitry Baryshkov Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20250411112251.68002-8-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman

dt-bindings: nvmem: convert U-Boot env to a layout

2024-09-03T10:13:18Z

U-Boot environment variables can be stored in various data sources. MTD is just one of available options. Refactor DT binding into a layout so it can be used with UBI volumes and other NVMEM devices. Link: https://lore.kernel.org/all/20231221173421.13737-1-zajec5@gmail.com/ Signed-off-by: Rafał Miłecki Reviewed-by: Rob Herring (Arm) Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20240902142952.71639-4-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman

nvmem: fixed-cell: Simplify nested if/then schema

2024-03-07T20:21:53Z

There's no reason to have a nested if/then schema as checking for compatible being present and containing 'mac-base' can all be done in one 'if' schema. Signed-off-by: Rob Herring Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20240224114516.86365-2-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman

Merge tag 'char-misc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2023-09-01T16:53:54Z

Pull char/misc driver updates from Greg KH: "Here is the big set of char/misc and other small driver subsystem changes for 6.6-rc1. Stuff all over the place here, lots of driver updates and changes and new additions. Short summary is: - new IIO drivers and updates - Interconnect driver updates - fpga driver updates and additions - fsi driver updates - mei driver updates - coresight driver updates - nvmem driver updates - counter driver updates - lots of smaller misc and char driver updates and additions All of these have been in linux-next for a long time with no reported problems" * tag 'char-misc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (267 commits) nvmem: core: Notify when a new layout is registered nvmem: core: Do not open-code existing functions nvmem: core: Return NULL when no nvmem layout is found nvmem: core: Create all cells before adding the nvmem device nvmem: u-boot-env:: Replace zero-length array with DECLARE_FLEX_ARRAY() helper nvmem: sec-qfprom: Add Qualcomm secure QFPROM support dt-bindings: nvmem: sec-qfprom: Add bindings for secure qfprom dt-bindings: nvmem: Add compatible for QCM2290 nvmem: Kconfig: Fix typo "drive" -> "driver" nvmem: Explicitly include correct DT includes nvmem: add new NXP QorIQ eFuse driver dt-bindings: nvmem: Add t1023-sfp efuse support dt-bindings: nvmem: qfprom: Add compatible for MSM8226 nvmem: uniphier: Use devm_platform_get_and_ioremap_resource() nvmem: qfprom: do some cleanup nvmem: stm32-romem: Use devm_platform_get_and_ioremap_resource() nvmem: rockchip-efuse: Use devm_platform_get_and_ioremap_resource() nvmem: meson-mx-efuse: Convert to devm_platform_ioremap_resource() nvmem: lpc18xx_otp: Convert to devm_platform_ioremap_resource() nvmem: brcm_nvram: Use devm_platform_get_and_ioremap_resource() ...

dt-bindings: nvmem: fixed-cell: add compatible for MAC cells

2023-08-23T14:34:00Z

A lot of home routers have NVMEM fixed cells containing MAC address that need some further processing. In ~99% cases MAC needs to be: 1. Optionally parsed from ASCII format 2. Increased by a vendor-picked value There was already an attempt to design a binding for that at NVMEM device level in the past. It wasn't accepted though as it didn't really fit NVMEM device layer. The introduction of NVMEM fixed-cells layout seems to be an opportunity to provide a relevant binding in a clean way. This commit adds a *generic* compatible string: "mac-base". As always it needs to be carefully reviewed. OpenWrt project currently supports ~300 home routers that have NVMEM cell with binary-stored base MAC.T hose devices are manufactured by multiple vendors. There are TP-Link devices (76 of them), Netgear (19), D-Link (11), OpenMesh (9), EnGenius (8), GL.iNet (8), ZTE (7), Xiaomi (5), Ubiquiti (6) and more. Those devices don't share an architecture or SoC. Another 200 devices have base MAC stored in an ASCII format (not all those devices have been converted to DT though). It would be impractical to provide unique "compatible" strings for NVMEM layouts of all those devices. It seems like a valid case for allowing a generic binding instead. Even if this binding will not be sufficient for some further devices it seems to be useful enough as it is. Signed-off-by: Rafał Miłecki Reviewed-by: Rob Herring Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20230823132744.350618-2-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman

dt-bindings: Fix typos

2023-08-18T16:32:25Z

Fix typos in Documentation/devicetree/bindings. The changes are in descriptions or comments where they shouldn't affect functionality. Signed-off-by: Bjorn Helgaas Link: https://lore.kernel.org/r/20230814212822.193684-3-helgaas@kernel.org Signed-off-by: Rob Herring

dt-bindings: nvmem: layouts: add fixed-layout

2023-06-15T11:42:17Z

With the introduction of NVMEM layouts, new NVMEM content structures should be defined as such. We should also try to convert / migrate existing NVMEM content bindings to layouts. This commit handles fixed NVMEM cells. So far they had to be defined directly - as device subnodes. With this change it's allowed to put them in the DT node named "nvmem-layout". Having NVMEM cells in separated node is preferred as it draws a nice line between NVMEM device and its content. It results in cleaner bindings. FWIW a very similar situation has happened to MTD devices and their partitions: see commit 5d96ea42eb63 ("dt-bindings: mtd: Clarify all partition subnodes"). Signed-off-by: Rafał Miłecki Reviewed-by: Rob Herring Signed-off-by: Srinivas Kandagatla Message-ID: <20230611140330.154222-24-srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman