The front panel LED on the Cubox-i is driven by one of the iMX6 PWM
channels, and is wired between the PWM output and supply. This means
that outputting a low level results in the LED being turned on, so we
need the duty cycle inverted.
There's a question about whether the output inversion should be at the
pwm or pwm-leds level - setting the output inversion bit in the iMX6
results in a PWM duty cycle of zero outputting logic zero, meaning that
the LED is fully on. This is undesirable, as it becomes impossible to
turn the LED fully off.
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
=-DO NOT APPLY-=
arch/arm/boot/dts/imx6qdl-cubox-i.dtsi | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi b/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
index 64daa3b311f6..d9fbd7ff17df 100644
=-DO NOT APPLY-= a/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
=+DO NOT APPLY+= b/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
@@ -12,6 +12,20 @@
pinctrl-0 = <&pinctrl_cubox_i_ir>;
};
=+DO NOT APPLY+= pwmleds {
=+DO NOT APPLY+= compatible = "pwm-leds";
=+DO NOT APPLY+= pinctrl-names = "default";
=+DO NOT APPLY+= pinctrl-0 = <&pinctrl_cubox_i_pwm1>;
=+DO NOT APPLY+=
=+DO NOT APPLY+= front {
=+DO NOT APPLY+= active-low;
=+DO NOT APPLY+= default-brightness = <128>;
=+DO NOT APPLY+= label = "imx6:red:front";
=+DO NOT APPLY+= max-brightness = <248>;
=+DO NOT APPLY+= pwms = <&pwm1 0 50000>;
=+DO NOT APPLY+= };
=+DO NOT APPLY+= };
=+DO NOT APPLY+=
regulators {
compatible = "simple-bus";
@@ -88,6 +102,10 @@
>;
};
=+DO NOT APPLY+= pinctrl_cubox_i_pwm1: cubox-i-pwm1-front-led {
=+DO NOT APPLY+= fsl,pins = <MX6QDL_PAD_DISP0_DAT8__PWM1_OUT 0x1b0b0>;
=+DO NOT APPLY+= };
=+DO NOT APPLY+=
pinctrl_cubox_i_spdif: cubox-i-spdif {
fsl,pins = <MX6QDL_PAD_GPIO_17__SPDIF_OUT 0x1b0b0>;
};
--
1.8.3.1
--
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