linux-kernel - Re: [PATCH] dt-bindings: mt76: add active-low property to led

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Date:   Tue, 7 Feb 2023 11:40:51 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org
Cc:     Frank Wunderlich <frank-w@...lic-files.de>,
        Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: mt76: add active-low property to led

On 07/02/2023 11:25, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> LEDs can be in low-active mode, so add dt property for it.
> 
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> ---
>  .../devicetree/bindings/net/wireless/mediatek,mt76.yaml      | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml b/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> index f0c78f994491..212508672979 100644
> --- a/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> +++ b/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
> @@ -112,6 +112,11 @@ properties:
>      $ref: /schemas/leds/common.yaml#
>      additionalProperties: false
>      properties:
> +      led-active-low:
> +        description:
> +          LED is enabled with ground signal.

What does it mean? You set voltage of regulator to 0? Or you set GPIO as
0? If the latter, it's not the property of LED...

Best regards,
Krzysztof