linux-kernel - Re: [PATCH v1 1/2] dt-bindings: mtd: amlogic,meson-nand: support fields for boot ROM code

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Date: Wed, 3 Apr 2024 12:02:17 -0500
From: Rob Herring <robh@...nel.org>
To: Arseniy Krasnov <avkrasnov@...utedevices.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
	oxffffaa@...il.com, kernel@...rdevices.ru
Subject: Re: [PATCH v1 1/2] dt-bindings: mtd: amlogic,meson-nand: support
 fields for boot ROM code

On Tue, Apr 02, 2024 at 11:27:04PM +0300, Arseniy Krasnov wrote:
> Boot ROM code on Meson requires that some pages on NAND must be written
> in special mode: "short" ECC mode where each block is 384 bytes and
> scrambling mode is on. Such pages located with the specified interval
> within specified offset. Both interval and offset are located in the
> device tree and used by driver if 'nand-is-boot-medium' is set for
> NAND chip.
> 
> Signed-off-by: Arseniy Krasnov <avkrasnov@...utedevices.com>
> ---
>  .../bindings/mtd/amlogic,meson-nand.yaml         | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> index 57b6957c8415..f49819ee76b8 100644
> --- a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> +++ b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> @@ -64,11 +64,27 @@ patternProperties:
>          items:
>            maximum: 0
>  
> +      meson,boot-page-last:

'meson' is not a valid vendor.

> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description:
> +          The NFC driver needs this information to select ECC
> +          algorithms supported by the boot ROM.
> +          Only used in combination with 'nand-is-boot-medium'.

No need to state what's captured with constraints.

> +
> +      meson,boot-page-step:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description:
> +          The NFC driver needs this information to select ECC
> +          algorithms supported by the boot ROM.
> +          Only used in combination with 'nand-is-boot-medium'.

step is in blocks/pages/bytes?

> +
>      unevaluatedProperties: false
>  
>      dependencies:
>        nand-ecc-strength: [nand-ecc-step-size]
>        nand-ecc-step-size: [nand-ecc-strength]
> +      meson,boot-page-last: [nand-is-boot-medium]
> +      meson,boot-page-step: [nand-is-boot-medium]

I assume both properties must be present? If so:

meson,boot-page-last: ['meson,boot-page-step']
meson,boot-page-step: ['meson,boot-page-last']

Rob