linux-kernel - Re: [PATCH 1/2] dt-bindings: leds: register-bit-led: Add value property

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Date:   Mon, 11 Jul 2022 14:06:50 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     Rob Herring <robh@...nel.org>, Pavel Machek <pavel@....cz>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Marek Behún <kabel@...nel.org>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: leds: register-bit-led: Add value property

On Wed, Jul 6, 2022 at 6:23 PM Pali Rohár <pali@...nel.org> wrote:
> On Wednesday 06 July 2022 10:21:11 Rob Herring wrote:
> > On Wed, Jul 06, 2022 at 01:28:27PM +0200, Pali Rohár wrote:
> > > Allow to define inverted logic (0 - enable LED, 1 - disable LED) via value
> > > property. This property name is already used by other syscon drivers, e.g.
> > > syscon-reboot.
> >
> > Yes, but those are potentially multi-bit values. This is a single bit
> > value, and the only value that's ever needed is 0. Why not just use
> > 'active-low' here?
>
> Just because to have uniform definitions across more syscon nodes.

But what happens if he mask and value don't line up?

mask = 0x10;
value = 0x08;

If you just state active-low; this kind of mistake is not possible to make.

So I'd rather go for active-low;

Yours,
Linus Walleij