drivers/amlogic/media/vout/backlight/aml_bl.dts

/*
 * drivers/amlogic/media/vout/backlight/aml_bl.dts
 *
 * Copyright (C) 2017 Amlogic, Inc. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

backlight{
	compatible = "amlogic, backlight";
	dev_name = "backlight";
	status = "okay";
	pinctrl-names = "pwm_on","pwm_off","pwm_vs_on","pwm_vs_off",
			"pwm_combo_on", "pwm_combo_off";
	pinctrl-0 = <&bl_pwm_on_pins>;
	pinctrl-1 = <&bl_pwm_off_pins>;
	pinctrl-2 = <&bl_pwm_vs_on_pins>;
	pinctrl-3 = <&bl_pwm_vs_off_pins>;
	pinctrl-4 = <&bl_pwm_combo_on_pins>;
	pinctrl-5 = <&bl_pwm_combo_off_pins>;

	/* power index:(point gpios_index, 0xff=invalid) */
	/* power value:(0=output low, 1=output high, 2=input) */
	/* power delay:(unit in ms) */
	bl-gpios = <&gpio GPIOAO_4 GPIO_ACTIVE_HIGH
		&gpio GPIOY_13 GPIO_ACTIVE_HIGH
		&gpio GPIOY_8 GPIO_ACTIVE_HIGH>;
	bl_gpio_names = "GPIOAO_4","GPIOY_13","GPIOY_8";

	backlight_0{
		index = <0>;
		bl_name = "backlight_0";
		bl_level_default_uboot_kernel = <100 100>;
		bl_level_attr = <255 10 128 102>;
			/* max, min, mid, mid_mapping */

		bl_ctrl_method = <1>;
			/* 0=gpio, 1=pwm, 2=pwm_combo, 3=ldim, 4=extern */
		bl_power_attr = <0 1 0 200 200>;
			/* en_gpio_index, on_value, off_value,
			 * on_delay, off_delay
			 */

		/* pwm_method:(0=negative, 1=positive) */
		/* pwm_freq:(pwm_vs: 1~4 vfreq multiple,
		 * other pwm: real freq unit: Hz)
		 */
		/* pwm_duty:(unit in %) */

		bl_pwm_port = "PWM_B";
			/* PWM_A, PWM_B, PWM_C, PWM_D, PWM_VS */
		bl_pwm_attr = <1 180 100 25>;
			/* pwm_method, pwm_freq, duty_max, duty_min */
		bl_pwm_power = <1 0 10 10>;
			/* pwm_gpio_index, pwm_gpio_off,
			 * pwm_on_delay, pwm_off_delay
			 */
	};
	backlight_1{
		index = <1>;
		bl_name = "backlight_1";
		bl_level_default_uboot_kernel = <100 100>;
		bl_level_attr = <255 10 128 102>;
			/* max, min, mid, mid_mapping */

		bl_ctrl_method = <1>;
			/* 0=gpio, 1=pwm, 2=pwm_combo, 3=ldim, 4=extern */
		bl_power_attr = <0 1 0 200 200>;
			/* en_gpio_index, on_value, off_value,
			 * on_delay, off_delay
			 */

		/* pwm_method: 0=negative, 1=positive */
		/* pwm_freq: pwm_vs: 1~4(vfreq multiple),
		 * other pwm: real freq(unit: Hz)
		 */
		/* duty_max, duty_min: unit in % */

		bl_pwm_port = "PWM_VS";
			/* PWM_A, PWM_B, PWM_C, PWM_D, PWM_VS */
		bl_pwm_attr = <1 2 100 25>;
			/* pwm_method, pwm_freq, duty_max, duty_min */
		bl_pwm_power = <1 0 10 10>;
			/* pwm_gpio_index, pwm_off_value,
			 * pwm_on_delay, pwm_off_delay
			 */
	};
	backlight_2{
		index = <2>;
		bl_name = "backlight_2";
		bl_level_attr = <255 10 128 102>;
			/* max, min, mid, mid_mapping */

		bl_ctrl_method = <3>;
			/* 0=gpio, 1=pwm, 2=pwm_combo, 3=ldim, 4=extern */
		bl_power_attr = <0 1 0 200 200>;
			/* en_gpio_index, on_value,
			 * off_value, on_delay, off_delay
			 */
	};
	backlight_3{
		index = <3>;
		bl_name = "backlight_3";
		bl_level_default_uboot_kernel = <100 100>;
		bl_level_attr = <255 10 128 102>;
			/* max, min, mid, mid_mapping */

		bl_ctrl_method = <2>;
			/* 0=gpio, 1=pwm, 2=pwm_combo, 3=ldim, 4=extern */
		bl_power_attr = <0 1 0 200 200>;
			/* en_gpio_index, on_value,
			 *	off_value, on_delay, off_delay
			 */

		/* pwm_method: 0=negative, 1=positive */
		/* pwm_freq: pwm_vs: 1~4(vfreq multiple),
		 * other pwm: real freq(unit: Hz)
		 */
		/* duty_max, duty_min: unit in % */

		bl_pwm_combo_level_mapping = <255 128 128 10>;
			/* level_max, level_min */
		bl_pwm_combo_port = "PWM_B","PWM_D";
			/* PWM_A, PWM_B, PWM_C, PWM_D, PWM_VS */
		bl_pwm_combo_attr = <1 180 100 25
			0 18000 100 25>;
			/* pwm_method, pwm_freq, duty_max, duty_min */
		bl_pwm_combo_power = <1 0 2 0 10 10>;
			/* pwm0_gpio_index, pwm0_gpio_off,
			 * pwm1_gpio_index, pwm1_gpio_off,
			 * pwm_on_delay, pwm_off_delay
			 */
	};
};