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@xxxxxxxxx>
> ---
Reviewed-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
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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