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SubjectRe: [PATCH v3 3/4] dt-bindings: backlight: Add led-backlight binding
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Pavel,

On 10/07/2019 21:13, Pavel Machek wrote:
> On Wed 2019-07-10 14:39:31, Jean-Jacques Hiblot wrote:
>> Add DT binding for led-backlight.
>>
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
>> ---
>> .../bindings/leds/backlight/led-backlight.txt | 28 +++++++++++++++++++
>> 1 file changed, 28 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
>>
>> 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..0444eec8efe1
>> --- /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.
> Ok.
>
>> +It can also be used to describe a backlight device controlled by the output of
>> +a LED driver.
> ? The LED driver should better be driving some LEDs...

Well. we are dependent of the board design. If a board designer decided
to control a backlight with a LED-controller, then we have to deal with it.

In practice there are a lot of LED drivers that actually drive the LEDs
using PWMs and can be used for this purpose.

JJ

>
>> +Required properties:
>> + - compatible: "led-backlight"
>> + - leds: a list of LEDs
>> +
>> +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 not provided, the
>> + identity mapping is used.
> "If it is not"
> Pavel

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