[v3,2/3] dt-bindings: mtd: Add a property to declare secure regions in NAND chips

Message ID 20210225140842.66927-3-manivannan.sadhasivam@linaro.org
State Superseded
Headers show
  • Add support for secure regions in Qcom NANDc driver
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Commit Message

Manivannan Sadhasivam Feb. 25, 2021, 2:08 p.m.
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@linaro.org>

 Documentation/devicetree/bindings/mtd/nand-controller.yaml | 7 +++++++
 1 file changed, 7 insertions(+)


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diff --git a/Documentation/devicetree/bindings/mtd/nand-controller.yaml b/Documentation/devicetree/bindings/mtd/nand-controller.yaml
index d0e422f4b3e0..acc7dfd6ef28 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.
+      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