linux-kernel - Re: [PATCH 4/6] dt-bindings: thermal: rockchip: document otp thermal trim

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Message-ID: <20250219231036.GA3137058-robh@kernel.org>
Date: Wed, 19 Feb 2025 17:10:36 -0600
From: Rob Herring <robh@...nel.org>
To: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	kernel@...labora.com, linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] dt-bindings: thermal: rockchip: document otp thermal
 trim

On Sun, Feb 16, 2025 at 12:34:53AM +0100, Nicolas Frattaroli wrote:
> Several Rockchip SoCs, such as the RK3576, can store calibration trim
> data for thermal sensors in OTP cells. This capability should be
> documented.

Is several most or a minority as this change is enabled for everyone.

> 
> Such a rockchip thermal sensor may reference cell handles that store
> both a chip-wide trim for all the sensors, as well as cell handles
> for each individual sensor channel pointing to that specific sensor's
> trim value.
> 
> Additionally, the thermal sensor may optionally reference cells which
> store the base in terms of degrees celsius and decicelsius that the trim
> is relative to.
> 
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
> ---
>  .../bindings/thermal/rockchip-thermal.yaml         | 44 ++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/rockchip-thermal.yaml b/Documentation/devicetree/bindings/thermal/rockchip-thermal.yaml
> index 49ceed68c92ce5a32ed8d4f39bd88fd052de0e80..8d27ddefcc64e29f0faab059888805802c948b41 100644
> --- a/Documentation/devicetree/bindings/thermal/rockchip-thermal.yaml
> +++ b/Documentation/devicetree/bindings/thermal/rockchip-thermal.yaml
> @@ -40,6 +40,21 @@ properties:
>        - const: tsadc
>        - const: apb_pclk
>  
> +  nvmem-cells:
> +    items:
> +      - description: cell handle of the low byte of the chip fallback trim value
> +      - description: cell handle of the high byte of the chip fallback trim value
> +      - description: cell handle to where the trim's base temperature is stored
> +      - description:
> +          cell handle to where the trim's tenths of Celsius base value is stored
> +
> +  nvmem-cell-names:
> +    enum:
> +      - trim_l
> +      - trim_h
> +      - trim_base
> +      - trim_base_frac
> +
>    resets:
>      minItems: 1
>      maxItems: 3
> @@ -51,6 +66,12 @@ properties:
>        - const: tsadc
>        - const: tsadc-phy
>  
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
>    "#thermal-sensor-cells":
>      const: 1
>  
> @@ -72,6 +93,29 @@ properties:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      enum: [0, 1]
>  
> +patternProperties:
> +  "^([a-z]+)@[0-9]+$":

If each node is a sensor or channel, then make that the node name.

> +    type: object
> +    properties:
> +      reg:
> +        maxItems: 1
> +        description: sensor ID, a.k.a. channel number
> +
> +      nvmem-cells:
> +        items:
> +          - description: handle of cell containing low byte of calibration data
> +          - description: handle of cell containing high byte of calibration data
> +
> +      nvmem-cell-names:
> +        items:
> +          - const: trim_l
> +          - const: trim_h
> +
> +    required:
> +      - reg
> +
> +    unevaluatedProperties: false
> +
>  required:
>    - compatible
>    - reg
> 
> -- 
> 2.48.1
>