| Message ID | 20190710123932.28244-4-jjhiblot@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add a generic driver for LED-based backlight | expand |
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... > +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
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
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. +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 + +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. + + - default-brightness-level: The default brightness level. + +Example: + + backlight { + compatible = "led-backlight"; + + leds = <&led1>, <&led2>; + brightness-levels = <0 4 8 16 32 64 128 255>; + default-brightness-level = <6>; + };
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