From ee590106c331ad54df9da3052b5c52014b2edb0b Mon Sep 17 00:00:00 2001 From: Manivannan Sadhasivam Date: Fri, 2 Apr 2021 20:31:26 +0530 Subject: [PATCH] dt-bindings: mtd: Add a property to declare secure regions in NAND chips 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. Reviewed-by: Rob Herring Signed-off-by: Manivannan Sadhasivam Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210402150128.29128-3-manivannan.sadhasivam@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..678b39952502 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/uint64-matrix + 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. + required: - reg