Re: [PATCH v8 3/3] dt-bindings: mtd: qcom_nandc: document qcom,boot-partitions binding

From: Manivannan Sadhasivam <mani@kernel.org>
To: Christian Marangi <ansuelsmth@gmail.com>
Cc: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	linux-arm-msm@vger.kernel.org, linux-mtd@lists.infradead.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v8 3/3] dt-bindings: mtd: qcom_nandc: document qcom,boot-partitions binding
Date: Fri, 17 Jun 2022 02:00:35 +0530	[thread overview]
Message-ID: <20220616203035.GE2889@thinkpad> (raw)
In-Reply-To: <20220616001835.24393-4-ansuelsmth@gmail.com>

On Thu, Jun 16, 2022 at 02:18:35AM +0200, Christian Marangi wrote:
> Document new qcom,boot-partition binding used to apply special
> read/write layout to boot partitions.
> 
> QCOM apply a special layout where spare data is not protected
> by ECC for some special pages (used for boot partition). Add
> Documentation on how to declare these special pages.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> ---

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>

Thanks,
Mani

>  .../devicetree/bindings/mtd/qcom,nandc.yaml   | 27 +++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
> index 84ad7ff30121..482a2c068740 100644
> --- a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
> +++ b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
> @@ -102,6 +102,31 @@ allOf:
>              - const: rx
>              - const: cmd
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,ipq806x-nand
> +
> +    then:
> +      properties:
> +        qcom,boot-partitions:
> +          $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +          items:
> +            items:
> +              - description: offset
> +              - description: size
> +          description:
> +            Boot partition use a different layout where the 4 bytes of spare
> +            data are not protected by ECC. Use this to declare these special
> +            partitions by defining first the offset and then the size.
> +
> +            It's in the form of <offset1 size1 offset2 size2 offset3 ...>
> +            and should be declared in ascending order.
> +
> +            Refer to the ipq8064 example on how to use this special binding.
> +
>  required:
>    - compatible
>    - reg
> @@ -135,6 +160,8 @@ examples:
>          nand-ecc-strength = <4>;
>          nand-bus-width = <8>;
>  
> +        qcom,boot-partitions = <0x0 0x58a0000>;
> +
>          partitions {
>            compatible = "fixed-partitions";
>            #address-cells = <1>;
> -- 
> 2.36.1
> 

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