linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: adc: Add support for MT7981

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Message-ID: <a30cbe3a-7d1b-4072-880e-99688657a093@baylibre.com>
Date: Wed, 2 Jul 2025 17:01:07 -0500
From: David Lechner <dlechner@...libre.com>
To: Aleksander Jan Bajkowski <olek2@...pl>, jic23@...nel.org,
 nuno.sa@...log.com, andy@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, matthias.bgg@...il.com,
 angelogioacchino.delregno@...labora.com, zhiyong.tao@...iatek.com,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] dt-bindings: iio: adc: Add support for MT7981

On 7/2/25 4:48 PM, Aleksander Jan Bajkowski wrote:
> The temperature sensor in the MT7981 is same as in the MT7986.
> Add compatible string for mt7981.
> 
> Signed-off-by: Aleksander Jan Bajkowski <olek2@...pl>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  .../devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml      | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml b/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
> index b489c984c1bb..ceb914dde15b 100644
> --- a/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
> @@ -26,6 +26,7 @@ properties:
>            - mediatek,mt2712-auxadc
>            - mediatek,mt6765-auxadc
>            - mediatek,mt7622-auxadc
> +          - mediatek,mt7981-auxadc
>            - mediatek,mt7986-auxadc
>            - mediatek,mt8173-auxadc
>        - items:

The new compatible with fallback should look like this:

diff --git a/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml b/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
index b489c984c1bb..14363389f30a 100644
--- a/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
@@ -32,6 +32,10 @@ properties:
           - enum:
               - mediatek,mt7623-auxadc
           - const: mediatek,mt2701-auxadc
+      - items:
+          - enum:
+              - mediatek,mt7981-auxadc
+          - const: mediatek,mt7986-auxadc
       - items:
           - enum:
               - mediatek,mt6893-auxadc
---

Then you can validate that the next patch matches the bindings with
`make CHECK_DTBS=1`. I would expect it to fail currently since the
binding is specifying a compatible without a fallback but the .dts
uses a fallback.