Linux/AM3351: PWM for brightness control

khageswararao bongu

Expert 1380 points

Part Number: AM3351

Tool/software: Linux

hi, i am using psdk-04.01.00.06

using pwm i am able to control lcd back light brightness

ex: echo 8 > /sys/class/backlight/backlight/brightness

i am getting max brightness for 8.

i want to set range 0 to 16 as per my application. how can i do this

over 7 years ago

0 Kemal R. Shakir over 7 years ago

TI__Guru 55345 points

Hello khageswararao,

Please, add 8 more brightness-levels in your backlight node.

	lcd_bl: backlight {
		compatible = "pwm-backlight";
		pwms = <&ecap0 0 50000 0>;
		brightness-levels = <0 51 53 56 62 75 101 152 255>;
		default-brightness-level = <8>;
	};

Best regards,
Kemal

0 khageswararao bongu over 7 years ago in reply to Kemal R. Shakir

Expert 1380 points

thanks for your great support.
after modifying brightness-levels = <0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 255 >;
it's working

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Linux/AM3351: PWM for brightness control