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Subject[PATCH 4/4] ARM: dts: AM33XX: Add PWM backlight DT data to am335x-evmsk
Date
From: Philip Avinash <avinashphilip@ti.com>

PWM output from ecap2 uses as backlight source. Also adds low threshold
value to have a uniform divisions in brightness-levels scales with
inverse polarity.

Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
arch/arm/boot/dts/am335x-evmsk.dts | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/arch/arm/boot/dts/am335x-evmsk.dts b/arch/arm/boot/dts/am335x-evmsk.dts
index f67c360..c21fdaf 100644
--- a/arch/arm/boot/dts/am335x-evmsk.dts
+++ b/arch/arm/boot/dts/am335x-evmsk.dts
@@ -51,6 +51,12 @@
0x9c 0x27 /* gpmc_ben0_cle.gpio2_5, INPUT | MODE7 */
>;
};
+
+ ecap2_pins: backlight_pins {
+ pinctrl-single,pins = <
+ 0x19c 0x4 /* mcasp0_ahclkr.ecap2_in_pwm2_out MODE4 */
+ >;
+ };
};

ocp {
@@ -94,6 +100,16 @@
st,max-limit-z = <750>;
};
};
+
+ epwmss2: epwmss@48304000 {
+ status = "okay";
+
+ ecap2: ecap@48304100 {
+ status = "okay";
+ pinctrl-names = "default";
+ pinctrl-0 = <&ecap2_pins>;
+ };
+ };
};

vbat: fixedregulator@0 {
@@ -170,6 +186,13 @@
gpios = <&gpio2 5 0>;
};
};
+
+ backlight {
+ compatible = "pwm-backlight";
+ pwms = <&ecap2 0 50000 1>;
+ brightness-levels = <0 58 61 66 75 90 125 170 255>;
+ default-brightness-level = <8>;
+ };
};

/include/ "tps65910.dtsi"
--
1.7.10.4


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