On 29/04/2022 23:16, Ansuel Smith wrote:
> Document new qcom,boot_pages binding used to apply special
> read/write configuration to boot pages.
>
> QCOM apply a special configuration 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: Ansuel Smith <ansuelsmth@xxxxxxxxx>
> ---
> .../devicetree/bindings/mtd/qcom,nandc.yaml | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
> index 84ad7ff30121..ef243109689d 100644
> --- a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
> +++ b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
> @@ -78,6 +78,17 @@ allOf:
> Must contain the ADM data type CRCI block instance number
> specified for the NAND controller on the given platform
>
> + qcom,boot_pages:
No underscores in property names.
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + description:
> + Some special page used by boot partition have spare data
> + not protected by ECC. Use this to declare these special page
> + by defining first the offset and then the size.
> +
> + It's in the form of <offset1 size1 offset2 size2 offset3 ...>
Then it look like uint32-matrix.
> +
> + Refer to the ipq8064 example on how to use this special binding.
Property does not look valid for other variants, so it should be made
false for them (in allOf:if:then).
> +
> - if:
> properties:
> compatible:
> @@ -135,6 +146,8 @@ examples:
> nand-ecc-strength = <4>;
> nand-bus-width = <8>;
>
> + qcom,boot_pages = <0x0 0x58a0000>;
> +
> partitions {
> compatible = "fixed-partitions";
> #address-cells = <1>;
Best regards,
Krzysztof
