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

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Date:   Tue, 8 Oct 2019 14:51:51 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...com>
To:     Rob Herring <robh+dt@...nel.org>
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

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 ?


>
>> 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 ?

JJ

>
> Rob