[PATCH 2/3] dt-bindings: mtd: Add a property to declare secure regions in Qcom NANDc
From: Manivannan Sadhasivam <hidden>
Date: 2021-02-22 12:04:52
Also in:
linux-arm-msm, lkml
Subsystem:
arm/qualcomm mailing list, memory technology devices (mtd), open firmware and flattened device tree bindings, qualcomm nand controller driver, the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Manivannan Sadhasivam, Linus Torvalds
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 <redacted> --- 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#"
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2.25.1