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From:   Rob Herring <robh@kernel.org>
To:     Edward Chow <equu@openmail.cc>
Cc:     linux-kernel@vger.kernel.org,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        linux-mtd@lists.infradead.org, devicetree@vger.kernel.org,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>
In-Reply-To: <20231025052937.830813-1-equu@openmail.cc>
References: <20231025052937.830813-1-equu@openmail.cc>
Message-Id: <169823714202.3554834.10341623302238023195.robh@kernel.org>
Subject: Re: [PATCH] dt-bindings: mtd-partitions: Export special values
Date:   Wed, 25 Oct 2023 07:33:02 -0500
Precedence: bulk


On Wed, 25 Oct 2023 13:29:37 +0800, Edward Chow wrote:
> There are special "offset" and "size" values defined and documented in
> linux/mtd/partitions.h:
> 
> // consume as much as possible, leaving size after the end of partition.
> 
> // the partition will start at the next erase block.
> 
> // the partition will start where the previous one ended.
> 
> (Though not explicitly, they are compared against variables in uint64_t
> in drivers/mtd/mtdpart.c, so they had better be considered as such.)
> 
> // the partition will extend to the end of the master MTD device.
> 
> These special values could be used to define partitions automatically
> fitting to the size of the master MTD device at runtime.
> 
> However, these values used not to be exported to dt-bindings, thus
> seldom used before, since they might have been only used in numeric form,
> such as "(-1) (-3)" for MTDPART_OFS_RETAIN.
> 
> Now, they are exported in dt-bindings/mtd/partitions.h as 32-bit cell
> values, so 2-cell addressed should be defined to use special offset values,
> such as "MTDPART_OFS_SPECIAL MTDPART_OFS_RETAIN" for MTDPART_OFS_RETAIN in
> linux/mtd/partitions.h. An example is added to fixed-partitions.yaml.
> 
> Signed-off-by: Edward Chow <equu@openmail.cc>
> ---
>  .../mtd/partitions/fixed-partitions.yaml      | 29 +++++++++++++++++++
>  MAINTAINERS                                   |  2 ++
>  include/dt-bindings/mtd/partitions.h          | 15 ++++++++++
>  3 files changed, 46 insertions(+)
>  create mode 100644 include/dt-bindings/mtd/partitions.h
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
Error: Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.example.dts:225.24-25 syntax error
FATAL ERROR: Unable to parse input tree
make[2]: *** [scripts/Makefile.lib:419: Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.example.dtb] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/builds/robherring/dt-review-ci/linux/Makefile:1427: dt_binding_check] Error 2
make: *** [Makefile:234: __sub-make] Error 2

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20231025052937.830813-1-equu@openmail.cc

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.