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From:   Gene Chen <gene.chen.richtek@gmail.com>
Date:   Mon, 23 Nov 2020 11:00:09 +0800
Message-ID: <CAE+NS363BpytNGZzfZHLa7KLKL8gjGj14oNvRi3oaH9KT79REg@mail.gmail.com>
Subject: Re: [PATCH v7 2/5] dt-bindings: leds: Add LED_COLOR_ID_MOONLIGHT definitions
To:     Jacek Anaszewski <jacek.anaszewski@gmail.com>
Cc:     Pavel Machek <pavel@ucw.cz>, Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Dan Murphy <dmurphy@ti.com>,
        Linux LED Subsystem <linux-leds@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Gene Chen <gene_chen@richtek.com>, Wilma.Wu@mediatek.com,
        shufan_lee@richtek.com, cy_huang@richtek.com,
        benjamin.chao@mediatek.com
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Jacek Anaszewski <jacek.anaszewski@gmail.com> =E6=96=BC 2020=E5=B9=B411=E6=
=9C=8820=E6=97=A5 =E9=80=B1=E4=BA=94 =E4=B8=8A=E5=8D=886:26=E5=AF=AB=E9=81=
=93=EF=BC=9A
>
> On 11/19/20 10:57 PM, Pavel Machek wrote:
> > On Thu 2020-11-19 22:03:14, Jacek Anaszewski wrote:
> >> Hi Pavel, Gene,
> >>
> >> On 11/18/20 10:37 PM, Pavel Machek wrote:
> >>> Hi!
> >>>
> >>>> From: Gene Chen <gene_chen@richtek.com>
> >>>>
> >>>> Add LED_COLOR_ID_MOONLIGHT definitions
> >>>
> >>> Why is moonlight a color? Camera flashes are usually white, no?
> >>>
> >>> At least it needs a comment...
> >>
> >> That's my fault, In fact I should have asked about adding
> >> LED_FUNCTION_MOONLIGHT, it was evidently too late for me that evening.=
..
> >
> > Aha, that makes more sense.
> >
> > But please let's call it "torch" if we do that, as that is already
> > used in kernel sources... and probably in the interface, too:
>
> I'd say that torch is something different that moonlight,
> but we would need more input from Gene to learn more about
> the nature of light emitted by ML LED on his device.
>
> Please note that torch is usually meant as the other mode of
> flash LED (sometimes it is called "movie mode"), which is already
> handled by brightness file of LED class flash device (i.e. its LED class
> subset), and which also maps to v4l2-flash TORCH mode.
>

It's used to front camera fill light.
More brightness than screen backlight, and more soft light than flash.
I think LED_ID_COLOR_WHITE is okay.

> > ./arch/arm/mach-pxa/ezx.c:                      .name =3D "a910::torch"=
,
> >
> > Best regards,
> >                                                       Pavel
> >
>
> --
> Best regards,
> Jacek Anaszewski