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

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Date:   Tue, 7 Feb 2023 13:12:08 +0100
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org, 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: Aw: Re: [PATCH] dt-bindings: mt76: add active-low property to led

> Gesendet: Dienstag, 07. Februar 2023 um 11:40 Uhr
> Von: "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>
> 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...

basicly it is a gpio-led mapped into the mt76 driver, but not passing gpio itself in this property (like gpio-led does).
This gpio is set to 0 signal (gnd) to let the led go on ;) so imho it is a led-property, but below the wifi-node as
the trigger comes from mt76 hardware, not an external (soc) gpio controller.

mt76 driver supports it already like i post change here:

https://patchwork.kernel.org/project/linux-mediatek/patch/20230205174833.107050-1-linux@fw-web.de/

only needed the binding for it.

> Best regards,
> Krzysztof
>
>