linux-kernel - Re: [PATCH v2 1/8] dt-bindings: leds: Convert register-bit-led binding to DT schema

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Date:   Tue, 14 Sep 2021 11:22:36 -0500
From:   Rob Herring <robh@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Stephen Boyd <sboyd@...nel.org>, Pavel Machek <pavel@....cz>,
        Liviu Dudau <liviu.dudau@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>
Subject: Re: [PATCH v2 1/8] dt-bindings: leds: Convert register-bit-led
 binding to DT schema

On Tue, Sep 14, 2021 at 12:41:31AM +0200, Linus Walleij wrote:
> On Mon, Sep 13, 2021 at 9:28 PM Rob Herring <robh@...nel.org> wrote:
> 
> > Convert the register-bit-led binding to DT schema format.
> >
> > As the example just repeats nearly identical nodes, trim it down to a
> > few nodes and use some documented values for 'linux,default-trigger'.
> >
> > Cc: Linus Walleij <linus.walleij@...aro.org>
> > Cc: Pavel Machek <pavel@....cz>
> > Cc: linux-leds@...r.kernel.org
> > Signed-off-by: Rob Herring <robh@...nel.org>
> 
> Thanks for doing this!
> 
> > v2:
> >  - Drop undocumented linux,default-trigger values
> 
> Will this lead to warnings? People tend to want to use these.

Yes. The list for linux,default-trigger was purposely limited rather 
than just throw in all the occurrences we could find. It's kind of a 
mess with similar or overlapping names.

There's other and better ways to do this now. There's the 'function' 
property and you can link to another device. 

> 
> (Possibly we could actually create operating-system independent
> triggers that make sense on any system. But it's another can
> of worms we don't need to open today.)
> 
> > +    enum:
> > +      [ 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80, 0x100, 0x200, 0x400, 0x800,
> > +        0x1000, 0x2000, 0x4000, 0x8000, 0x10000, 0x20000, 0x40000, 0x80000,
> > +        0x100000, 0x200000, 0x400000, 0x800000, 0x1000000, 0x2000000, 0x4000000,
> > +        0x8000000, 0x10000000, 0x20000000, 0x40000000, 0x80000000 ]
> 
> That's an interesting looking enum :D
> 
> But I can't think of anything better, so:

We could define our own type, but I can't say I recall the need for this 
elsewhere.

> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Thanks.

Rob