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Message-ID: <20210327170920.GA249312@robh.at.kernel.org>
Date: Sat, 27 Mar 2021 11:09:20 -0600
From: Rob Herring <robh@...nel.org>
To: Michael Walle <michael@...le.cc>
Cc: linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [RFC PATCH 3/4] dt-bindings: mtd: add OTP bindings
On Mon, Mar 22, 2021 at 07:19:48PM +0100, Michael Walle wrote:
> 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@...le.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]+)?":
Needs '$' on the end.
> + 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";
Soon (in linux-next, but off by default) this will be a warning for
undocumented compatible string. Use a real device.
> +
> + 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>;
> + };
> + };
> + };
> + };
The 2nd example is a superset of the 1st, so drop the first one.
Rob
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