Re: [PATCH v3 13/14] dt-bindings: mtd: nand-controller: Fix matching with size-cells==1

Rob Herring
2020-09-04T22:29:28Z

On Fri, Sep 4, 2020 at 9:25 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> Most of Freescale/NXP GPMI device trees use size-cells==1 (even when
> actually not needed except few boards). This fixes dtbs_check warnings
> like:
>
> arch/arm64/boot/dts/freescale/imx8mm-beacon-kit.dt.yaml: nand-controller@33002000: #size-cells:0:0: 0 was expected
>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> ---
> Documentation/devicetree/bindings/mtd/nand-controller.yaml | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/mtd/nand-controller.yaml b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
> index 40fc5b0b2b8c..0879e1108837 100644
> --- a/Documentation/devicetree/bindings/mtd/nand-controller.yaml
> +++ b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
> @@ -34,7 +34,10 @@ properties:
> const: 1
>
> "#size-cells":
> - const: 0
> + description:
> + Depends on your controller. Put zero unless you need a mapping between CS
> + lines and dedicated memory regions.
> + enum: [0, 1]

Humm, seems that was to describe partitions, but the expectation of
the nand binding is describing nand chips. It seems the nand chips are
never described and on 1 board even has partitions. I think you should
fix the dts to move 'partition@N' nodes under 'partitions' which is
preferred and needed if you ever describe nand chips. And then fix
'#size-cells' to be 0.

Rob