迅为国产RK3568开发板Android移植 LCD 屏幕

dsi1: dsi@fe070000 {
compatible = "rockchip,rk3568-mipi-dsi";
reg = <0x0 0xfe070000 0x0 0x10000>;
interrupts = <GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&cru PCLK_DSITX_1>, <&cru HCLK_VO>, <&video_phy1>;
clock-names = "pclk", "hclk", "hs_clk";
resets = <&cru SRST_P_DSITX_1>;
reset-names = "apb";
phys = <&video_phy1>;
phy-names = "mipi_dphy";
power-domains = <&power RK3568_PD_VO>;
rockchip,grf = <&grf>;
#address-cells = <1>;
#size-cells = <0>;
status = "disabled";
ports {
#address-cells = <1>;
#size-cells = <0>;
dsi1_in: port@0 {
reg = <0>;
#address-cells = <1>;
#size-cells = <0>;
dsi1_in_vp0: endpoint@0 {
reg = <0>;
remote-endpoint = <&vp0_out_dsi1>;
status = "disabled";
};
dsi1_in_vp1: endpoint@1 {
reg = <1>;
remote-endpoint = <&vp1_out_dsi1>;
status = "disabled";
};
};
};
};

&dsi1 {
status = "okay";
dsi1_panel: panel@0 {
status = "okay";
compatible = "simple-panel-dsi";
reg = <0>;
//供电电压是 3.3V
power-supply = <&vcc3v3_lcd1_n>;
//设置背光
backlight = <&backlight>;
//reset-gpios 表示屏幕 reset 引脚，拉低，具体的拉高或者拉低要根据内
核配置和时序要求来进行对应的修改
reset-gpios = <&gpio3 RK_PC7 GPIO_ACTIVE_LOW>;
//enable-gpios = <&gpio3 RK_PC6 GPIO_ACTIVE_HIGH>;
//下述配置中有一些延时，reset-delay-ms 是在屏幕初始化过程中，第一次
操作 reset 引脚之前的延时。init-delay-ms，是在屏幕初始化过程中，第一次操作 reset 引脚
之后的延时。
reset-delay-ms = <60>;
enable-delay-ms = <60>;//<35>; //<60>;
prepare-delay-ms = <60>;//<6>; //<60>;
unprepare-delay-ms = <60>;//<0>; //<60>;
disable-delay-ms = <60>;//<20>; //<60>;
dsi,flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET)>;
dsi,format = <MIPI_DSI_FMT_RGB888>;
//dsi,lanes = <4>;是配置当前 mipi 是几通道的，需根据屏幕实际情况配置。
dsi,lanes = <4>;
// panel-init-sequence 填写刚刚改写好的初始化序列
panel-init-sequence = [
39 00 03 E0 AB BA
39 00 03 E1 BA AB
.................
05 C8 01 11
05 14 01 29
];
//panel-exit-sequence 填写 display off 序列，一般为两条，也需要厂家提供。
panel-exit-sequence = [
05 05 01 28
05 78 01 10
];
//这一部分也很重要，是屏幕的一些参数。hactive 和 vactive 就是水平数值的像素，也就是
屏 幕 分 辨 率 了 。 hback-porch,hfront-porch,vback-porch,vfront-porch 按 顺 序 简 写 为
HBP,HFP,VBP,VFP,这个跟厂家讨要后，根据简写字母对应即可。这个在之前的章节中已经讲解
过了。
disp_timings0: display-timings {
native-mode = <&dsi1_timing0>;
dsi1_timing0: timing0 {
//clock-frequency 像素时钟频率
//像素时钟频率 = （
hactive+hbp+hfp+hsync-len）x (vactive+vbp+vfp+vsync-len)xfps
// 然后保留两位有效数字（不要四舍五入），后面数据直接填 0 即可。
clock-frequency = <72000000>;
//以下的这些参数在数据手册中，我们已经查找到了。
hactive = <800>;
vactive = <1280>;
hfront-porch = <48>; //20
hsync-len = <20>;
hback-porch = <48>; //20
vfront-porch = <16>; //10
vsync-len = <6>; //10
vback-porch = <15>; //4
hsync-active = <0>;
vsync-active = <0>;
de-active = <0>;
pixelclk-active = <0>;
};
};
//配置 ports
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
panel_in_dsi1: endpoint {
remote-endpoint = <&dsi1_out_panel>;
};
};
};
};
ports {
#address-cells = <1>;
#size-cells = <0>;
port@1 {
reg = <1>;
dsi1_out_panel: endpoint {
remote-endpoint = <&panel_in_dsi1>;
};
};
};
};

backlight1: backlight1 {
compatible = "pwm-backlight";
pwms = <&pwm5 0 25000 0>;
brightness-levels = <
0 20 20 21 21 22 22 23
23 24 24 25 25 26 26 27
27 28 28 29 29 30 30 31
.................................................
>;
default-brightness-level = <200>;
};
kernel/arch/arm64/boot/dts/rockchip/topeet_rk3568_lcds.dtsi 设备树中添加背光节点
&backlight {
status = "okay";
pwm = <&pwm5 0 25000 0>;
};