linux-kernel - [PATCH 2/3] dt-bindings: mtd: Add a property to declare secure regions in Qcom NANDc

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Message-Id: <20210222120259.94465-3-manivannan.sadhasivam@linaro.org>
Date:   Mon, 22 Feb 2021 17:32:58 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        robh+dt@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        boris.brezillon@...labora.com,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 2/3] dt-bindings: mtd: Add a property to declare secure regions in Qcom NANDc

On a typical end product, a vendor may choose to secure some regions in
the NAND memory which are supposed to stay intact between FW upgrades.
The access to those regions will be blocked by a secure element like
Trustzone. So the normal world software like Linux kernel should not
touch these regions (including reading).

So let's add a property for declaring such secure regions so that the
driver can skip touching them.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 Documentation/devicetree/bindings/mtd/qcom,nandc.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
index 84ad7ff30121..7500e20da9c1 100644
--- a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
+++ b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
@@ -48,6 +48,13 @@ patternProperties:
         enum:
           - 512
 
+      qcom,secure-regions:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        description:
+          Regions in the NAND memory which are protected using a secure element
+          like Trustzone. This property contains the start address and size of
+          the secure regions present (optional).
+
 allOf:
   - $ref: "nand-controller.yaml#"
 
-- 
2.25.1