Hi Manivannan, Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> wrote on Mon, 22 Feb 2021 17:32:58 +0530: > 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@xxxxxxxxxx> > --- > 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). What does this "(optional)" means? If you mean the property is optional then it should be described accordingly in the yaml file, or am I missing something? I wonder if it wouldn't be better to make this a NAND chip node property. I don't think a qcom prefix is needed as potentially many other SoCs might have the same "feature". I'm fine adding support for it in the qcom driver only though. > + > allOf: > - $ref: "nand-controller.yaml#" > Thanks, Miquèl
