linux-kernel - Re: [PATCH v9,2/7] dt-bindings: thermal: Add dt-binding document for LVTS thermal controllers

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Date:   Wed, 14 Sep 2022 14:19:10 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     bchihi@...libre.com, rafael@...nel.org, rui.zhang@...el.com,
        daniel.lezcano@...aro.org, amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        khilman@...libre.com, mka@...omium.org, robh+dt@...nel.org,
        krzk+dt@...nel.org, matthias.bgg@...il.com, p.zabel@...gutronix.de,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, james.lo@...iatek.com,
        fan.chen@...iatek.com, louis.yu@...iatek.com,
        rex-bc.chen@...iatek.com, abailon@...libre.com
Subject: Re: [PATCH v9,2/7] dt-bindings: thermal: Add dt-binding document for
 LVTS thermal controllers

Il 17/08/22 10:07, bchihi@...libre.com ha scritto:
> From: Alexandre Bailon <abailon@...libre.com>
> 
> Add dt-binding document for mt8192 and mt8195 LVTS thermal controllers.
> 
> Signed-off-by: Alexandre Bailon <abailon@...libre.com>
> Co-developed-by: Balsam CHIHI <bchihi@...libre.com>
> Signed-off-by: Balsam CHIHI <bchihi@...libre.com>
> ---
>   .../thermal/mediatek,lvts-thermal.yaml        | 152 ++++++++++++++++++
>   1 file changed, 152 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/thermal/mediatek,lvts-thermal.yaml
> 
> diff --git a/Documentation/devicetree/bindings/thermal/mediatek,lvts-thermal.yaml b/Documentation/devicetree/bindings/thermal/mediatek,lvts-thermal.yaml
> new file mode 100644
> index 000000000000..31d9e220513a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/thermal/mediatek,lvts-thermal.yaml
> @@ -0,0 +1,152 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/thermal/mediatek,lvts-thermal.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek SoC LVTS thermal controller

title: MediaTek SoC Low Voltage Thermal Sensor (LVTS)

> +
> +maintainers:
> +  - Yu-Chia Chang <ethan.chang@...iatek.com>
> +  - Ben Tseng <ben.tseng@...iatek.com>
> +
> +description: |

description:
   LVTS is a thermal management architecture composed of three subsystems,
   a Sensing device - Thermal Sensing Micro Circuit Unit (TSMCU),
   a Convertor - Low Voltage Thermal Sensor convertor (LVTS), and
   a Digital controller (LVTS_CTRL).

> +  LVTS (Low Voltage Thermal Sensor).
> +  The architecture will be first used on mt8192 and mt8195.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt8192-lvts-ap
> +      - mediatek,mt8192-lvts-mcu
> +      - mediatek,mt8195-lvts-ap
> +      - mediatek,mt8195-lvts-mcu
> +
> +  "#thermal-sensor-cells":
> +    const: 1
> +
> +  reg:
> +    maxItems: 1
> +    description: LVTS instance registers.

This description looks obvious, as it doesn't really say anything "new"...
I would rather drop it.

> +
> +  interrupts:
> +    maxItems: 1
> +    description: LVTS instance interrupts.

Same here

> +
> +  clocks:
> +    maxItems: 1
> +    description: LVTS instance clock.

and here.

> +
> +  resets:
> +    maxItems: 1
> +    description: |
> +      LVTS instance SW reset for HW AP/MCU domain to clean temporary data
> +      on HW initialization/resume.

What about something like...

   resets:
     items:
       - description: LVTS reset for clearing temporary data on AP/MCU

> +
> +  nvmem-cells:
> +    minItems: 1
> +    maxItems: 2
> +    description: Calibration efuse data for LVTS

   nvmem-cells:
     minItems: 1
     items:
       - description: Calibration eFuse data for LVTS
       - description: Additional eFuse data (?)


> +
> +  nvmem-cell-names:
> +    minItems: 1
> +    maxItems: 2
> +    description: Calibration efuse cell names for LVTS

Actually, maxItems is not really two, but it depends on how many
eFuse arrays / nvmem cells we have for each SoC, so I was thinking...

...what about doing something like

   nvmem-cell-names:
     minItems: 1
     items:
       pattern: 'lvts-calib-data[0-9]+$'

and then,
   if:
     properties:
       compatible:
         contains:
           enum:
             - mediatek,blahblah-something
   then:
     properties:
       nvmem-cell-names:
         maxItems: 2 (or 3, 4, 5...)

P.S.: I haven't tried any binding check on the proposed lines.

Krzysztof, any opinions on that?

Regards,
Angelo