[PATCH v2 2/3] dt-bindings: mtd: Add a property to declare secure regions in NAND chips

Manivannan Sadhasivam manivannan.sadhasivam at linaro.org
Wed Feb 24 23:11:28 EST 2021

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
drivers can skip touching them.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam at linaro.org>
 Documentation/devicetree/bindings/mtd/nand-controller.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/nand-controller.yaml b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
index d0e422f4b3e0..4a528468b90f 100644
--- a/Documentation/devicetree/bindings/mtd/nand-controller.yaml
+++ b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
@@ -143,6 +143,13 @@ patternProperties:
           Ready/Busy pins. Active state refers to the NAND ready state and
           should be set to GPIOD_ACTIVE_HIGH unless the signal is inverted.
+      nand-secure-regions:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        description:
+          Regions in the NAND chip which are protected using a secure element
+          like Trustzone. This property contains the start address and size of
+          the secure regions present.
       - reg

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