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Date: Sat, 30 Apr 2022 16:43:20 +0200 From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> To: Ansuel Smith <ansuelsmth@...il.com>, Andy Gross <agross@...nel.org>, Bjorn Andersson <bjorn.andersson@...aro.org>, Manivannan Sadhasivam <mani@...nel.org>, Miquel Raynal <miquel.raynal@...tlin.com>, Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, linux-arm-msm@...r.kernel.org, linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/2] dt-bindings: mtd: qcom_nandc: document qcom,boot_pages binding On 29/04/2022 23:16, Ansuel Smith wrote: > Document new qcom,boot_pages binding used to apply special > read/write configuration to boot pages. > > QCOM apply a special configuration where spare data is not protected > by ECC for some special pages (used for boot partition). Add > Documentation on how to declare these special pages. > > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com> > --- > .../devicetree/bindings/mtd/qcom,nandc.yaml | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml > index 84ad7ff30121..ef243109689d 100644 > --- a/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml > +++ b/Documentation/devicetree/bindings/mtd/qcom,nandc.yaml > @@ -78,6 +78,17 @@ allOf: > Must contain the ADM data type CRCI block instance number > specified for the NAND controller on the given platform > > + qcom,boot_pages: No underscores in property names. > + $ref: /schemas/types.yaml#/definitions/uint32-array > + description: > + Some special page used by boot partition have spare data > + not protected by ECC. Use this to declare these special page > + by defining first the offset and then the size. > + > + It's in the form of <offset1 size1 offset2 size2 offset3 ...> Then it look like uint32-matrix. > + > + Refer to the ipq8064 example on how to use this special binding. Property does not look valid for other variants, so it should be made false for them (in allOf:if:then). > + > - if: > properties: > compatible: > @@ -135,6 +146,8 @@ examples: > nand-ecc-strength = <4>; > nand-bus-width = <8>; > > + qcom,boot_pages = <0x0 0x58a0000>; > + > partitions { > compatible = "fixed-partitions"; > #address-cells = <1>; Best regards, Krzysztof
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