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 <mich...@walle.cc>
---
.../devicetree/bindings/mtd/mtd.yaml | 71 +++++++++++++++++++
1 file changed, 71 insertions(+)
diff --git a/Documentation/devicetree/bindings/mtd/mtd.yaml
b/Documentation/devicetree/bindings/mtd/mtd.yaml
index 321259aab0f6..2b852f91a6a9 100644
--- a/Documentation/devicetree/bindings/mtd/mtd.yaml
+++ b/Documentation/devicetree/bindings/mtd/mtd.yaml
@@ -21,6 +21,25 @@ properties:
based name) in order to ease flash device identification and/or
describe what they are used for.
+patternProperties:
+ "^otp(-[0-9]+)?":
+ type: object
+ $ref: ../nvmem/nvmem.yaml#
+
+ description: |
+ An OTP memory region. Some flashes provide a one-time-programmable
+ memory whose content can either be programmed by a user or is already
+ pre-programmed by the factory. Some flashes might provide both.
+
+ properties:
+ compatible:
+ enum:
+ - mtd-user-otp
+ - mtd-factory-otp
+
+ required:
+ - compatible
+
additionalProperties: true
examples:
@@ -36,4 +55,56 @@ examples:
};
};
+ - |
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ flash@0 {
+ reg = <0>;
+ compatible = "some,flash";
+
+ otp {
+ compatible = "mtd-user-otp";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ serial-number@0 {
+ reg = <0 16>;
+ };
+ };
+ };
+ };
+
+ - |
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ flash@0 {
+ reg = <0>;
+ compatible = "some,flash";
+
+ otp-1 {
+ compatible = "mtd-factory-otp";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ electronic-serial-number@0 {
+ reg = <0 8>;
+ };
+ };
+
+ otp-2 {
+ compatible = "mtd-user-otp";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ mac-address@0 {
+ reg = <0 6>;
+ };
+ };
+ };
+ };
+
...
--
2.20.1
