linux-kernel - Re: [PATCH] dt-bindings: nvmem: nxp,lpc1850-otp: convert to DT schema

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Message-ID: <e0cb1964-50ec-4c21-9fa2-2400297b9042@gmail.com>
Date: Mon, 26 Jan 2026 20:22:36 +0530
From: Akhila YS <akhilayalmati@...il.com>
To: Vladimir Zapolskiy <vz@...ia.com>, Srinivas Kandagatla
 <srini@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: nvmem: nxp,lpc1850-otp: convert to DT schema


On 26-01-2026 18:58, Vladimir Zapolskiy wrote:
> Hello Akhila.
>
> On 1/23/26 17:19, Akhila YS wrote:
>> Convert NXP LPC18xx OTP memory controller binding to YAML format.
>>
>> Signed-off-by: Akhila YS <akhilayalmati@...il.com>
>> ---
>>   .../devicetree/bindings/nvmem/lpc1850-otp.txt      | 20 ---------
>>   .../devicetree/bindings/nvmem/nxp,lpc1850-otp.yaml | 51
>> ++++++++++++++++++++++
>>   2 files changed, 51 insertions(+), 20 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
>> b/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
>> deleted file mode 100644
>> index 853b6a754644..000000000000
>> --- a/Documentation/devicetree/bindings/nvmem/lpc1850-otp.txt
>> +++ /dev/null
>> @@ -1,20 +0,0 @@
>> -* NXP LPC18xx OTP memory
>> -
>> -Internal OTP (One Time Programmable) memory for NXP LPC18xx/43xx
>> devices.
>> -
>> -Required properties:
>> -  - compatible: Should be "nxp,lpc1850-otp"
>> -  - reg: Must contain an entry with the physical base address and
>> length
>> -    for each entry in reg-names.
>> -  - address-cells: must be set to 1.
>> -  - size-cells: must be set to 1.
>> -
>> -See nvmem.txt for more information.
>> -
>> -Example:
>> -  otp: otp@...45000 {
>> -    compatible = "nxp,lpc1850-otp";
>> -    reg = <0x40045000 0x1000>;
>> -    #address-cells = <1>;
>> -    #size-cells = <1>;
>> -  };
>> diff --git
>> a/Documentation/devicetree/bindings/nvmem/nxp,lpc1850-otp.yaml
>> b/Documentation/devicetree/bindings/nvmem/nxp,lpc1850-otp.yaml
>> new file mode 100644
>> index 000000000000..d37e928e7a35
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/nvmem/nxp,lpc1850-otp.yaml
>> @@ -0,0 +1,51 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/nvmem/nxp,lpc1850-otp.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: NXP LPC18xx / LPC43xx One-Time Programmable (OTP) memory
>> +
>> +maintainers:
>> +  - Srinivas Kandagatla <srini@...nel.org>
>
> You may add me as a maintainer, the change is not catched by the
> "lpc18xx"
> file name pattern from a record in the MAINTAINERS file, but essentially
> it's an NXP LPC18xx/LPC43xx related change. 
>

Sure, I will add you as a maintainer.


>> +
>> +description:
>> +  The internal OTP memory in NXP LPC18xx and LPC43xx microcontrollers
>> +  provides a dedicated non-volatile storage area designed for
>> permanent,
>> +  one-time configuration and data storage.The OTP controller manages
>> write
>
> Please remove all info after the first sentence.
>
>> +  protection, programming sequencing, and error detection mechanisms to
>> +  guarantee reliable and safe permanent programming under software
>> control.
>
> What is the source of the information above? I don't quite understand
> what
> is "error detection mechanisms" here etc. OTP controller functions are
> defined in SoC ROM, and it is unrelated to the described OTP memory
> region. 


Ok.


>
>> +
>> +allOf:
>> +  - $ref: nvmem.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: nxp,lpc1850-otp
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  "#address-cells":
>> +    const: 1
>> +
>> +  "#size-cells":
>> +    const: 1
>
> This comes from nvmem.yaml 


Yes, I will remove above two properties.


>
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - "#address-cells"
>> +  - "#size-cells"
>
> Please drop #address-cells/#size-cells from the list of the required
> properties.
>
> So far there is no user of this device tree node, and "nvmem-layout"
> mechanism may be preferred in future. 


Ok.


>
>> +
>> +unevaluatedProperties: false
>> +
>> +examples:
>> +  - |
>> +    otp@...45000 {
>> +        compatible = "nxp,lpc1850-otp";
>> +        reg = <0x40045000 0x1000>;
>> +        #address-cells = <1>;
>> +        #size-cells = <1>;
>> +    };
>> +...
>>
>
-- 
Best Regards,
Akhila.