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

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Date: Sat, 3 Feb 2024 14:49:50 +0000
From: Conor Dooley <conor@...nel.org>
To: William Zhang <william.zhang@...adcom.com>
Cc: Linux MTD List <linux-mtd@...ts.infradead.org>,
	Linux ARM List <linux-arm-kernel@...ts.infradead.org>,
	Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>,
	f.fainelli@...il.com, kursad.oney@...adcom.com,
	joel.peshkin@...adcom.com, anand.gore@...adcom.com, dregan@...l.com,
	kamal.dasu@...adcom.com, tomer.yacoby@...adcom.com,
	dan.beygelman@...adcom.com, devicetree@...r.kernel.org,
	Brian Norris <computersforpeace@...il.com>,
	linux-kernel@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Vignesh Raghavendra <vigneshr@...com>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Kamal Dasu <kdasu.kdev@...il.com>, Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v4 03/12] dt-bindings: mtd: brcmnand: Add ecc strap
 property

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

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