Re: [PATCH v4 03/12] dt-bindings: mtd: brcmnand: Add ecc strap property

[William Zhang]

On 2/3/24 06:49, Conor Dooley wrote:
> On Fri, Feb 02, 2024 at 04:28:24PM -0800, William Zhang wrote:
> > Add brcm,nand-ecc-use-strap to get ecc and spare area size settings from
> > board boot strap for broadband board designs because they do not specify
> > ecc setting in dts but rather using the strap setting.
> >
> > Signed-off-by: William Zhang <william.zhang@xxxxxxxxxxxx>
> >
> > ---
> >
> > Changes in v4:
> > - Move ecc strap property to this separate patch and remove some
> > non-binding related text from the description
> >
> > Changes in v3: None
> > Changes in v2: None
> >
> >   Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml | 8 ++++++++
> >   1 file changed, 8 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml b/Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml
> > index d0168d55c73e..2599d902ec3a 100644
> > --- a/Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml
> > +++ b/Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml
> > @@ -147,6 +147,14 @@ patternProperties:
> >             layout.
> >           $ref: /schemas/types.yaml#/definitions/uint32
> >   
> > +      brcm,nand-ecc-use-strap:
> > +        description:
> > +          This flag indicates the ecc strength and spare area size should
> > +          be retrieved from the SoC NAND boot strap setting instead of
> > +          nand-ecc-strength and brcm,nand-oob-sector-size or auto detection.
>
> I'm still on the fence about this being overly prescriptive about the
> operating systems behaviour. I think it would be good to say why the
> strap values are better than those explicitly provided in DT rather than
> just saying "these strap values should be used".
This is a board/SoC design choice.  I wouldn't advise it as better 
choice as other board/SoC may not have that option. But definitively for 
BCMBCA SoC board design, it is better and much easier and convenient 
option than explicit dt setting. How about: This property provides a 
choice for retrieving ecc strength and spare area size from the SoC NAND 
boot strap setting. It is commonly used by the BCMBCA SoC board design.

> > +          This is commonly used by the BCMBCA SoC board design.
> > +        $ref: /schemas/types.yaml#/definitions/flag
> > +
> >       unevaluatedProperties: false
> >   
> >   allOf:
> > --
> > 2.37.3

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