[PATCH 2/2] nvmem: layouts: add U-Boot env layout

[Jeff Johnson]

On 7/15/24 06:54, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal at milecki.pl>
> 
> U-Boot environment variables are stored in a specific format. Actual
> data can be placed in various storage sources (MTD, UBI volume, EEPROM,
> NVRAM, etc.).
> 
> Move all generic (NVMEM device independent) code from NVMEM device
> driver to an NVMEM layout driver. Then add a simple NVMEM layout code on
> top of it.
> 
> This allows using NVMEM layout for parsing U-Boot env data stored in any
> kind of NVMEM device.
> 
> The old NVMEM glue driver stays in place for handling bindings in the
> MTD context. To avoid code duplication it uses exported layout parsing
> function. Please note that handling MTD & NVMEM layout bindings may be
> refactored in the future.
> 
> Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
> Reviewed-by: Miquel Raynal <miquel.raynal at bootlin.com>
> ---
> This change was originally sent (and approved by Miquel) as a
> [PATCH V3 6/6] nvmem: layouts: add U-Boot env layout
> 
> I just adjusted it to the approved binding and updated commit message.
> I kept Miquel's Reviewed-by tag due to minimal changes.
> 
> I've successfully tested this code using it in both ways: as NVMEM
> device driver & NVMEM layout.
> 
>   MAINTAINERS                        |   1 +
>   drivers/nvmem/Kconfig              |   3 +-
>   drivers/nvmem/layouts/Kconfig      |  11 ++
>   drivers/nvmem/layouts/Makefile     |   1 +
>   drivers/nvmem/layouts/u-boot-env.c | 203 +++++++++++++++++++++++++++++
>   drivers/nvmem/layouts/u-boot-env.h |  15 +++
>   drivers/nvmem/u-boot-env.c         | 158 +---------------------
>   7 files changed, 234 insertions(+), 158 deletions(-)
>   create mode 100644 drivers/nvmem/layouts/u-boot-env.c
>   create mode 100644 drivers/nvmem/layouts/u-boot-env.h
> 
...

> +module_nvmem_layout_driver(u_boot_env_layout);
> +
> +MODULE_AUTHOR("Rafał Miłecki");
> +MODULE_LICENSE("GPL");
> +MODULE_DEVICE_TABLE(of, u_boot_env_of_match_table);

Is this missing a MODULE_DESCRIPTION()?

Since commit 1fffe7a34c89 ("script: modpost: emit a warning when the 
description is missing") a module without a MODULE_DESCRIPTION() will 
result in a warning with make W=1.

I'll hopefully have all existing warnings fixed in 6.11 so please avoid 
adding new ones :)

/jeff