linux-kernel - [PATCH v6 3/3] dt-bindings: mtd: qcom_nandc: document qcom,boot-partitions binding

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Message-Id: <20220609132344.17548-4-ansuelsmth@gmail.com>
Date:   Thu,  9 Jun 2022 15:23:44 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Manivannan Sadhasivam <mani@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-mtd@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ansuel Smith <ansuelsmth@...il.com>
Subject: [PATCH v6 3/3] 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: Ansuel Smith <ansuelsmth@...il.com>
Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
---
 .../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