[PATCH v3 2/2] dt-bindings: mtd: qcom_nandc: document qcom, boot-pages binding

Ansuel Smith
2022-05-18T18:43:30Z

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@gmail.com>
---
.../devicetree/bindings/mtd/qcom,nandc.yaml | 26 +++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
index 84ad7ff30121..3b8244db2ae8 100644
--- a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
+++ b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
@@ -102,6 +102,30 @@ allOf:
- const: rx
- const: cmd

+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - qcom,ipq8074-nand
+
+ then:
+ properties:
+ qcom,boot-pages:
+ $ref: /schemas/types.yaml#/definitions/uint32-matrix
+ items:
+ items:
+ - description: offset
+ - description: size
+ 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 ...>
+
+ Refer to the ipq8064 example on how to use this special binding.
+
required:
- compatible
- reg
@@ -135,6 +159,8 @@ examples:
nand-ecc-strength = <4>;
nand-bus-width = <8>;

+ qcom,boot-pages = <0x0 0x58a0000>;
+
partitions {
compatible = "fixed-partitions";