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

Manivannan Sadhasivam
2021-02-22T12:04:52Z

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@linaro.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