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dt-bindings: mtd: add OTP bindings
Flash devices can have one-time-programmable regions. Add a nvmem binding so they can be used as a nvmem provider. Signed-off-by: Michael Walle <michael@walle.cc> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20210424110608.15748-4-michael@walle.cc
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@ -21,6 +21,25 @@ properties:
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based name) in order to ease flash device identification and/or
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describe what they are used for.
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patternProperties:
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"^otp(-[0-9]+)?$":
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type: object
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$ref: ../nvmem/nvmem.yaml#
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description: |
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An OTP memory region. Some flashes provide a one-time-programmable
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memory whose content can either be programmed by a user or is already
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pre-programmed by the factory. Some flashes might provide both.
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properties:
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compatible:
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enum:
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- user-otp
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- factory-otp
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required:
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- compatible
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additionalProperties: true
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examples:
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@ -36,4 +55,35 @@ examples:
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};
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};
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- |
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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flash@0 {
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reg = <0>;
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compatible = "jedec,spi-nor";
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otp-1 {
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compatible = "factory-otp";
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#address-cells = <1>;
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#size-cells = <1>;
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electronic-serial-number@0 {
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reg = <0 8>;
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};
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};
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otp-2 {
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compatible = "user-otp";
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#address-cells = <1>;
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#size-cells = <1>;
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mac-address@0 {
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reg = <0 6>;
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};
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};
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};
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};
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...
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