On Tue, Mar 09, 2021 at 07:32:28PM -0700, Rob Herring wrote: > On Sun, Mar 7, 2021 at 10:31 PM Manivannan Sadhasivam > <manivannan.sadhasivam@xxxxxxxxxx> wrote: > > > > On Fri, Mar 05, 2021 at 05:36:57PM -0600, Rob Herring wrote: > > > On Mon, Feb 22, 2021 at 05:32:58PM +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 > > > > 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 > > > > > > Don't you need 64-bit regions potentially? Though 4GB should be enough > > > for anyone. > > > > > > > Yes, given the size of current NAND based systems around, I thought 32 bit is > > enough. > > Huh!? I was joking. 4GB is small nowadays. Make this 64-bit. > Well I was speaking in the context of Qcom chipsets making use of NAND. Mostly the Qcom modem chipsets have <4GB of memory. But since this property is now not specific to Qcom, I agree with you and will make it 64 bit. Thanks, Mani > Rob
