Commit 5278cc93 authored by Christian Marangi's avatar Christian Marangi Committed by Miquel Raynal
Browse files

dt-bindings: mtd: qcom_nandc: document qcom,boot-partitions binding 



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: default avatarChristian Marangi <ansuelsmth@gmail.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarManivannan Sadhasivam <mani@kernel.org>
Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220616001835.24393-4-ansuelsmth@gmail.com
parent 862bdedd

Documentation/devicetree/bindings/mtd/qcom,nandc.yaml

+27 −0
Original line number Diff line number Diff line
@@ -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>;