linux-kernel - Re: [PATCH v4 1/2] dt-bindings: iio: temperature: add support for MCP998X

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20250901-piquant-rousing-skunk-14da73@kuoka>
Date: Mon, 1 Sep 2025 06:03:50 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: victor.duicu@...rochip.com
Cc: jic23@...nel.org, dlechner@...libre.com, nuno.sa@...log.com, 
	andy@...nel.org, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
	marius.cristea@...rochip.com, linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH v4 1/2] dt-bindings: iio: temperature: add support for
 MCP998X

On Fri, Aug 29, 2025 at 05:34:46PM +0300, victor.duicu@...rochip.com wrote:
> From: Victor Duicu <victor.duicu@...rochip.com>
> 
> This is the devicetree schema for Microchip MCP998X/33 and MCP998XD/33D
> Multichannel Automotive Temperature Monitor Family.
> 
> Signed-off-by: Victor Duicu <victor.duicu@...rochip.com>
> ---
>  .../iio/temperature/microchip,mcp9982.yaml    | 203 ++++++++++++++++++
>  1 file changed, 203 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml b/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
> new file mode 100644
> index 000000000000..2f092e376fe8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
> @@ -0,0 +1,203 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/temperature/microchip,mcp9982.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip MCP998X/33 and MCP998XD/33D Multichannel Automotive
> +       Temperature Monitor Family

Looks like wrong indent.

> +
> +maintainers:
> +  - Victor Duicu <victor.duicu@...rochip.com>
> +
> +description: |
> +  The MCP998X/33 and MCP998XD/33D family is a high-accuracy 2-wire multichannel
> +  automotive temperature monitor.
> +  The datasheet can be found here:
> +    https://ww1.microchip.com/downloads/aemDocuments/documents/MSLD/ProductDocuments/DataSheets/MCP998X-Family-Data-Sheet-DS20006827.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,mcp9933
> +      - microchip,mcp9933d
> +      - microchip,mcp9982
> +      - microchip,mcp9982d
> +      - microchip,mcp9983
> +      - microchip,mcp9983d
> +      - microchip,mcp9984
> +      - microchip,mcp9984d
> +      - microchip,mcp9985
> +      - microchip,mcp9985d
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    minItems: 2
> +    maxItems: 2
> +
> +  interrupt-names:
> +    description:
> +      -alert-therm is used to handle a HIGH or LOW limit.
> +      -therm-addr is used to handle a THERM limit on chips
> +      without "D" in the name.
> +      -sys-shutdown is used to handle a THERM limit on chips
> +      with "D" in the name.

Descriptions go to interrupts.

> +    items:
> +      - const: alert-therm
> +      - const: therm-addr
> +      - const: sys-shutdown

I don't think you ever tested this. This does not match interrupts.

> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  microchip,enable-anti-parallel:
> +    description:
> +      Enable anti-parallel diode mode operation.
> +      MCP9984/84D/85/85D and MCP9933/33D support reading two external diodes
> +      in anti-parallel connection on the same set of pins.
> +    type: boolean
> +
> +  microchip,parasitic-res-on-channel1-2:
> +    description:
> +      Indicates that the chip and the diodes/transistors are sufficiently far
> +      apart that a parasitic resistance is added to the wires, which can affect
> +      the measurements. Due to the anti-parallel diode connections, channels
> +      1 and 2 are affected together.
> +    type: boolean
> +
> +  microchip,parasitic-res-on-channel3-4:
> +    description:
> +      Indicates that the chip and the diodes/transistors are sufficiently far
> +      apart that a parasitic resistance is added to the wires, which can affect
> +      the measurements. Due to the anti-parallel diode connections, channels
> +      3 and 4 are affected together.
> +    type: boolean
> +
> +  vdd-supply: true
> +
> +patternProperties:
> +  "^channel@[1-4]$":
> +    description:
> +      Represents the external temperature channels to which
> +      a remote diode is connected.
> +    type: object
> +
> +    properties:
> +      reg:

Missing min/maxItems.

> +        items:
> +          minimum: 1
> +          maximum: 4
> +
> +      microchip,ideality-factor:
> +        description:
> +          Each channel has an ideality factor.
> +          Beta compensation and resistance error correction automatically
> +          correct for most ideality errors. So ideality factor does not need
> +          to be adjusted in general.
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        default: 18
> +
> +      label:
> +        description: Unique name to identify which channel this is.
> +
> +    required:
> +      - reg
> +
> +    additionalProperties: false

Best regards,
Krzysztof