linux-kernel - Re: [PATCH v9 4/5] dt-bindings: backlight: Add led-backlight binding

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Message-ID: <CAL_JsqLzi3y8hBvx9Qpx7QKPGAzq_LyuEDdi35f9k8nEfj5wCw@mail.gmail.com>
Date:   Tue, 8 Oct 2019 09:52:55 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Jean-Jacques Hiblot <jjhiblot@...com>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>,
        Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Dan Murphy <dmurphy@...com>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: [PATCH v9 4/5] dt-bindings: backlight: Add led-backlight binding

On Tue, Oct 8, 2019 at 7:51 AM Jean-Jacques Hiblot <jjhiblot@...com> wrote:
>
> Hi Rob,
>
> On 07/10/2019 18:15, Rob Herring wrote:
> > Please send DT bindings to DT list or it's never in my queue. IOW,
> > send patches to the lists that get_maintainers.pl tells you to.
> >
> > On Mon, Oct 7, 2019 at 7:45 AM Jean-Jacques Hiblot <jjhiblot@...com> wrote:
> >> Add DT binding for led-backlight.
> >>
> >> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>
> >> Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
> >> Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> >> ---
> >>   .../bindings/leds/backlight/led-backlight.txt | 28 +++++++++++++++++++
> >>   1 file changed, 28 insertions(+)
> >>   create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> > Please make this a DT schema.
>
> OK.
>
> BTW I used "make dt_binding_check" but had to fix a couple of YAMLs file
> to get it to work. Do you have a kernel tree with already all the YAML
> files in good shape ? Or do you want me to post the changes to
> devicetree@...r.kernel.org ?

linux-next is fixed now.

> >> diff --git a/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> >> new file mode 100644
> >> index 000000000000..4c7dfbe7f67a
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> >> @@ -0,0 +1,28 @@
> >> +led-backlight bindings
> >> +
> >> +This binding is used to describe a basic backlight device made of LEDs.
> >> +It can also be used to describe a backlight device controlled by the output of
> >> +a LED driver.
> >> +
> >> +Required properties:
> >> +  - compatible: "led-backlight"
> >> +  - leds: a list of LEDs
> > 'leds' is already used as a node name and mixing is not ideal.
> >
> > We already have 'flash-leds' in use and with the same definition, so
> > lets continue that and use 'backlight-leds'.
> OK
> >
> >> +
> >> +Optional properties:
> >> +  - brightness-levels: Array of distinct brightness levels. The levels must be
> >> +                       in the range accepted by the underlying LED devices.
> >> +                       This is used to translate a backlight brightness level
> >> +                       into a LED brightness level. If it is not provided, the
> >> +                       identity mapping is used.
> >> +
> >> +  - default-brightness-level: The default brightness level.
> > You can just assume these 2 get a common schema at some point. So just
> > need to define any additional constraints if possible.
>
> Maybe we should keep them until such a common schema is written ?

I'm not saying to remove them, but you can just have a description if
there are no other constraints.

Rob