ARM: dts: imx6qdl-colibri: backlight pwm: Simplify inverted backlight

Set #pwm-cells to the default 3 to gain access to the parameter
which allows inverting the PWM signal. This is useful to specify
a backlight which has its highest brightness at 0.

With the change to use the PWM with inverted polarity the PWM signal
is inverted to how it was before this patch.
This changes the meaning of the values in the brightness-levels
property. I.e. the duty-cycle changes from x/255 to (255-x)/255.
Keeping the brightness-levels will then have a big brightness
jump from 0 to 127 duty cycle, the other 6 steps will then be
barely noticeable.

Change the brightness-levels to provide the same brightness-levels
as before.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx6qdl-colibri.dtsi b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
index f3965884b79799e4020e7c8b0c3863a36c0a2ba6..4e6a5f63199f7be03cb80c7cdb9f1f695e8a26cb 100644 (file)
--- a/arch/arm/boot/dts/imx6qdl-colibri.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-colibri.dtsi
@@ -6,6 +6,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pwm/pwm.h>
 
 / {
        model = "Toradex Colibri iMX6DL/S Module";
@@ -13,13 +14,13 @@
 
        backlight: backlight {
                compatible = "pwm-backlight";
-               brightness-levels = <0 127 191 223 239 247 251 255>;
-               default-brightness-level = <1>;
+               brightness-levels = <0 4 8 16 32 64 128 255>;
+               default-brightness-level = <6>;
                enable-gpios = <&gpio3 26 GPIO_ACTIVE_HIGH>; /* Colibri BL_ON */
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_gpio_bl_on>;
                power-supply = <&reg_module_3v3>;
-               pwms = <&pwm3 0 5000000>;
+               pwms = <&pwm3 0 5000000 PWM_POLARITY_INVERTED>;
                status = "disabled";
        };
 
@@ -620,7 +621,6 @@
 
 /* Colibri PWM<A> */
 &pwm3 {
-       #pwm-cells = <2>;
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_pwm3>;
        status = "disabled";