compatible = "pwm-backlight"; //匹配名 pwms = <&pwm1 0 25000>; //第一个参数表示使用pwm...
compatible = "fsl,imx6ul-pwm"; //调用pwm控制器驱动 pinctrl-0 = <&pinctrl_pwm3>; //配置soc引脚输出功能为pwm功能 }; 2.驱动配置 配置编译以下驱动 /drivers/video/backlight/backlight.c 用户层背光节点驱动 /drivers/video/backlight/pwm_bl.c 通用背光pwm设备驱动 /drivers/pwm/core.c pwm核心层驱...
pwm = pc->of_xlate //最终生成struct pwm_device类型. pwm_request //申请pwm,防止其他驱动也会使用. pwm_set_period //pb->pwm->period = data->pwm_period_ns pwm_get_period //获取period. dev_set_name(&pdev->dev, "rk28_bl"); //name不能改,用户空间会被用到:/sys/class/backlight/rk...
linux pwm backlight Linux系统中的PWM backlight是红帽操作系统中的一个重要功能。PWM backlight是一种通过调整显示器背光亮度的技术,通过调整PWM信号的占空比来控制显示器亮度的方法。在Linux系统中,我们可以通过红帽操作系统提供的工具和接口来实现PWM backlight的控制。 在红帽操作系统中,我们可以通过sysfs接口来控制...
文章目录 DTS 驱动分析 platform driver : probe 分析: DTS 目录:kernel/arch/arm64/boot/dts/rockchip/rk3399-nanopi4-common.dtsi 解释下:pwms = <&pwm0 0 25000 0>; 第一个参数表示此背光接在 pwm0 上;
backlight: backlight { status = "disabled"; compatible = "pwm-backlight"; pwms = <&pwm0 0 25000 0>; brightness-levels = < 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 ...
A dimming circuit for an indicator switch has a control input, a dimming state and a non-dimming state. The dimming circuit is responsive to the presence of a backlight PWM signal at the control input of the dimming circuit to switch to the dimming state and responsive to the absence of ...
/* SPDX-License-Identifier: GPL-2.0 */ /* * Generic PWM backlight driver data - see drivers/video/backlight/pwm_bl.c */ #ifndef __LINUX_PWM_BACKLIGHT_H #define __LINUX_PWM_BACKLIGHT_H #include <linux/backlight.h> struct platform_pwm_backlight_data { int pw...
Hi all, I am using imx287 processor based board for one of my Infotainment project. In this product lcd panel backlight is controlling by PWM4. I
(leds/backlight/pwm-backlight.txt) config VIDEO_BPP8 bool "Support 8-bit-per-pixel displays" depends on DM_VIDEO 4 changes: 1 addition & 3 deletions 4 drivers/video/Makefile Original file line numberDiff line numberDiff line change @@ -11,9 +11,7 @@ obj-$(CONFIG_DM_VIDEO) += ...