AM5729 lcd移植时，没有生成/dev/fb0节点

我们使用的是am5729芯片，硬件板公司自己制作，设备树文件参考am572x-idk，但是系统起来后，为什么没有生成 /dev/fb0节点

与lcd相关的设备树节点如下：

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>;
};

lcd: display {
compatible = "panel-dpi";
/*
enable-gpios = <&gpio3 30 GPIO_ACTIVE_HIGH>;
backlight = <&lcd_bl>;*/
label = "lcd";

panel-timing {
clock-frequency = <33300000>;
hactive = <800>;
vactive = <480>;

hfront-porch = <210>;
hback-porch = <46>;
hsync-len = <20>;

vfront-porch = <22>;
vback-porch = <23>;
vsync-len = <10>;

hsync-active = <1>;
vsync-active = <1>;

de-active = <0>;
pixelclk-active = <0>;
};

port {
lcd_in: endpoint {
remote-endpoint = <&dpi_out>;
};
};
};

&dss {
status = "okay";
vdda_video-supply = <&ldoln_reg>;
ports {
#address-cells = <1>;
#size-cells = <0>;

port {
reg = <1>;

dpi_out: endpoint {
data-lines = <24>;
remote-endpoint = <&lcd_in>;
};
};
};
};