linux-kernel - Re: [PATCH v3 1/3] dt-bindings: thermal: sophgo,cv1800-thermal: Add Sophgo CV1800 thermal

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Message-ID: <20240702-aptitude-overripe-8ac9aa3c6b90@spud>
Date: Tue, 2 Jul 2024 16:00:41 +0100
From: Conor Dooley <conor@...nel.org>
To: Haylen Chu <heylenay@...look.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>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Inochi Amaoto <inochiama@...look.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Jisheng Zhang <jszhang@...nel.org>, linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 1/3] dt-bindings: thermal: sophgo,cv1800-thermal: Add
 Sophgo CV1800 thermal

Rob/Krzysztof, Haylen,

On Tue, Jul 02, 2024 at 09:30:24AM +0000, Haylen Chu wrote:
> Add devicetree binding documentation for thermal sensors integrated in
> Sophgo CV180X SoCs.
> 
> Signed-off-by: Haylen Chu <heylenay@...look.com>
> ---
>  .../thermal/sophgo,cv1800-thermal.yaml        | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/thermal/sophgo,cv1800-thermal.yaml
> 
> diff --git a/Documentation/devicetree/bindings/thermal/sophgo,cv1800-thermal.yaml b/Documentation/devicetree/bindings/thermal/sophgo,cv1800-thermal.yaml
> new file mode 100644
> index 000000000000..016299822c16
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/thermal/sophgo,cv1800-thermal.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/thermal/sophgo,cv1800-thermal.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo CV1800 on-SoC Thermal Sensor
> +
> +maintainers:
> +  - Haylen Chu <heylenay@...look.com>
> +
> +description: Binding for Sophgo CV1800 on-SoC thermal sensor
> +
> +properties:
> +  compatible:
> +    enum:
> +      - sophgo,cv1800-thermal
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description: The thermal sensor clock
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  accumulation-period:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Accumulation period for a sample
> +    enum:
> +      - 512
> +      - 1024
> +      - 2048
> +      - 4096
> +    default: 2048
> +
> +  chop-period:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: ADC chop period
> +    enum:
> +      - 128
> +      - 256
> +      - 512
> +      - 1024
> +    default: 1024
> +
> +  sample-cycle-us:

the more common term btw would be "sample-rate" rather than
"sample-cycle".

> +    description: Period between samples. Should be greater than 524us.

The constraint here should be "minimum: 524". What's the upper limit?

> +    default: 1000000

Rob/Krzysztof, could you comment on the suitability of the three custom
properties here? I know if this was an IIO device, these kinds of things
would be controllable from userspace, and not in the binding. I
mentioned this on the previous version, but I'm not really sure if
thermal devices are somehow different:
https://lore.kernel.org/all/SEYPR01MB4221A739D0645EF0255336EBD7CE2@SEYPR01MB4221.apcprd01.prod.exchangelabs.com/

Cheers,
Conor.

> +
> +  '#thermal-sensor-cells':
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +        #include <dt-bindings/clock/sophgo,cv1800.h>
> +        #include <dt-bindings/interrupt-controller/irq.h>
> +        thermal-sensor@...0000 {
> +            compatible = "sophgo,cv1800-thermal";
> +            reg = <0x30e0000 0x100>;
> +            clocks = <&clk CLK_TEMPSEN>;
> +            interrupts = <16 IRQ_TYPE_LEVEL_HIGH>;
> +            #thermal-sensor-cells = <0>;
> +        };
> +...
> -- 
> 2.45.2
> 

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