Messages in this thread | | | Subject | Re: [PATCH 4/4] devicetree: Add led-backlight binding | From | Jean-Jacques Hiblot <> | Date | Tue, 2 Jul 2019 13:11:58 +0200 |
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Daniel,
On 02/07/2019 11:58, Daniel Thompson wrote: > On Mon, Jul 01, 2019 at 05:14:23PM +0200, Jean-Jacques Hiblot wrote: >> From: Tomi Valkeinen <tomi.valkeinen@ti.com> >> >> Add DT binding for led-backlight. > I think the patchset is in the wrong order; the DT bindings > documentation should appear *before* the binding is > implemented (amoung other things this prevent transient checkpatch > warnings as the patchset is applied). > ok >> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> >> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> >> Cc: devicetree@vger.kernel.org >> --- >> .../video/backlight/led-backlight.txt | 39 +++++++++++++++++++ >> 1 file changed, 39 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/video/backlight/led-backlight.txt >> >> diff --git a/Documentation/devicetree/bindings/video/backlight/led-backlight.txt b/Documentation/devicetree/bindings/video/backlight/led-backlight.txt >> new file mode 100644 >> index 000000000000..216cd52d624a >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/video/backlight/led-backlight.txt >> @@ -0,0 +1,39 @@ >> +led-backlight bindings >> + >> +The node of the backlight driver IS the node of the LED. >> + >> +Required properties: >> + - compatible: "led-backlight" >> + - brightness-levels: Array of distinct LED brightness levels. These >> + are in the range from 0 to 255, passed to the LED class driver. >> + - default-brightness-level: the default brightness level (index into the >> + array defined by the "brightness-levels" property) > I think brightness-levels and default-brightness-level could be > optional properties since a default 1:1 mapping seems reasonable given > how constrained the LED brightness values are.
That is probably a good idea. Expect it in v2
Thanks,
JJ
> > > Daniel. > > >> + >> +Optional properties: >> + - power-supply: regulator for supply voltage >> + - enable-gpios: contains a single GPIO specifier for the GPIO which enables >> + and disables the backlight (see GPIO binding[0]) >> + >> +[0]: Documentation/devicetree/bindings/gpio/gpio.txt >> + >> +Example: >> + >> +led_ctrl { >> + red_led@1 { >> + label = "red"; >> + reg = <1>; >> + } >> + >> + backlight_led@2 { >> + function = LED_FUNCTION_BACKLIGHT; >> + reg = <2>; >> + >> + compatible = "led-backlight"; >> + >> + brightness-levels = <0 4 8 16 32 64 128 255>; >> + default-brightness-level = <6>; >> + >> + power-supply = <&vdd_bl_reg>; >> + enable-gpios = <&gpio 58 0>; >> + }; >> +}; >> -- >> 2.17.1 >>
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