ARM: dts: AM33XX: Add PWM backlight DT data to am335x-evm

PWM output from ecap0 uses as backlight source. Also adds low threshold
value to have a uniform divisions in brightness-levels scales.

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>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>

diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 2c53247..a150d04 100644 (file)
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -91,6 +91,12 @@
                                0x9c (PIN_OUTPUT | MUX_MODE0)           /* gpmc_be0n_cle.gpmc_be0n_cle */
                        >;
                };
+
+               ecap0_pins: backlight_pins {
+                       pinctrl-single,pins = <
+                               0x164 0x0       /* eCAP0_in_PWM0_out.eCAP0_in_PWM0_out MODE0 */
+                       >;
+               };
        };
 
        ocp {
@@ -163,6 +169,16 @@
                        status = "okay";
                };
 
+               epwmss0: epwmss@48300000 {
+                       status = "okay";
+
+                       ecap0: ecap@48300100 {
+                               status = "okay";
+                               pinctrl-names = "default";
+                               pinctrl-0 = <&ecap0_pins>;
+                       };
+               };
+
                gpmc: gpmc@50000000 {
                        status = "okay";
                        pinctrl-names = "default";
@@ -299,6 +315,13 @@
                        gpio-key,wakeup;
                };
        };
+
+       backlight {
+               compatible = "pwm-backlight";
+               pwms = <&ecap0 0 50000 0>;
+               brightness-levels = <0 51 53 56 62 75 101 152 255>;
+               default-brightness-level = <8>;
+       };
 };
 
 #include "tps65910.dtsi"