| Message ID | 20210323073930.89754-3-manivannan.sadhasivam@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add support for secure regions in NAND | expand |
On Tue, 23 Mar 2021 13:09:29 +0530, Manivannan Sadhasivam wrote: > 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(+) > Reviewed-by: Rob Herring <robh@kernel.org>
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
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(+)