BeagleBoneBlack添加LCD驱动

使用的是最新的TI的SDK，内核是4.19版本

请参考以下类似的问题。
e2e.ti.com/.../921067

那fbdev不维护了，那是新增了别的方式驱动LCD吗

请参考下面SDK user guide上的说明，内核和dts的配置。
software-dl.ti.com/.../LCDC.html

By default DRM support for LCDC is not built in to the kernel when using omap2plus_defconfig.
Make sure that the following are disabled from .config as the fbdev driver cannot coexist with the DRM driver.
CONFIG_FB_DA8XX
CONFIG_FB_DA8XX_TDA998X
And add:
CONFIG_DRM=y/m
CONFIG_DRM_I2C_NXP_TDA998X=y/m
CONFIG_DRM_TILCDC=y/m


我想使用是是DA8XX，所以要禁用掉DRM驱动是吗

/*
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/dts-v1/;

#include "am33xx.dtsi"
#include "am335x-bone-common.dtsi"
#include "am335x-boneblack-common.dtsi"

&sgx {
status = "okay";
};

&cpu0_opp_table {
/*
* All PG 2.0 silicon may not support 1GHz but some of the early
* BeagleBone Blacks have PG 2.0 silicon which is guaranteed
* to support 1GHz OPP so enable it for PG 2.0 on this board.
*/
oppnitro-1000000000 {
opp-supported-hw = <0x06 0x0100>;
};
};


&am33xx_pinmux {

lcd_pins_s0: lcd_pins_s0 {
pinctrl-single,pins = <
AM33XX_IOPAD(0x820, PIN_OUTPUT | MUX_MODE1) /* gpmc_ad8.lcd_data23 */
AM33XX_IOPAD(0x824, PIN_OUTPUT | MUX_MODE1) /* gpmc_ad9.lcd_data22 */
AM33XX_IOPAD(0x828, PIN_OUTPUT | MUX_MODE1) /* gpmc_ad10.lcd_data21 */
AM33XX_IOPAD(0x82c, PIN_OUTPUT | MUX_MODE1) /* gpmc_ad11.lcd_data20 */
AM33XX_IOPAD(0x830, PIN_OUTPUT | MUX_MODE1) /* gpmc_ad12.lcd_data19 */
AM33XX_IOPAD(0x834, PIN_OUTPUT | MUX_MODE1) /* gpmc_ad13.lcd_data18 */
AM33XX_IOPAD(0x838, PIN_OUTPUT | MUX_MODE1) /* gpmc_ad14.lcd_data17 */
AM33XX_IOPAD(0x83c, PIN_OUTPUT | MUX_MODE1) /* gpmc_ad15.lcd_data16 */
AM33XX_IOPAD(0x8a0, PIN_OUTPUT | MUX_MODE0) /* lcd_data0.lcd_data0 */
AM33XX_IOPAD(0x8a4, PIN_OUTPUT | MUX_MODE0) /* lcd_data1.lcd_data1 */
AM33XX_IOPAD(0x8a8, PIN_OUTPUT | MUX_MODE0) /* lcd_data2.lcd_data2 */
AM33XX_IOPAD(0x8ac, PIN_OUTPUT | MUX_MODE0) /* lcd_data3.lcd_data3 */
AM33XX_IOPAD(0x8b0, PIN_OUTPUT | MUX_MODE0) /* lcd_data4.lcd_data4 */
AM33XX_IOPAD(0x8b4, PIN_OUTPUT | MUX_MODE0) /* lcd_data5.lcd_data5 */
AM33XX_IOPAD(0x8b8, PIN_OUTPUT | MUX_MODE0) /* lcd_data6.lcd_data6 */
AM33XX_IOPAD(0x8bc, PIN_OUTPUT | MUX_MODE0) /* lcd_data7.lcd_data7 */
AM33XX_IOPAD(0x8c0, PIN_OUTPUT | MUX_MODE0) /* lcd_data8.lcd_data8 */
AM33XX_IOPAD(0x8c4, PIN_OUTPUT | MUX_MODE0) /* lcd_data9.lcd_data9 */
AM33XX_IOPAD(0x8c8, PIN_OUTPUT | MUX_MODE0) /* lcd_data10.lcd_data10 */
AM33XX_IOPAD(0x8cc, PIN_OUTPUT | MUX_MODE0) /* lcd_data11.lcd_data11 */
AM33XX_IOPAD(0x8d0, PIN_OUTPUT | MUX_MODE0) /* lcd_data12.lcd_data12 */
AM33XX_IOPAD(0x8d4, PIN_OUTPUT | MUX_MODE0) /* lcd_data13.lcd_data13 */
AM33XX_IOPAD(0x8d8, PIN_OUTPUT | MUX_MODE0) /* lcd_data14.lcd_data14 */
AM33XX_IOPAD(0x8dc, PIN_OUTPUT | MUX_MODE0) /* lcd_data15.lcd_data15 */
AM33XX_IOPAD(0x8e0, PIN_OUTPUT | MUX_MODE0) /* lcd_vsync.lcd_vsync */
AM33XX_IOPAD(0x8e4, PIN_OUTPUT | MUX_MODE0) /* lcd_hsync.lcd_hsync */
AM33XX_IOPAD(0x8e8, PIN_OUTPUT | MUX_MODE0) /* lcd_pclk.lcd_pclk */
AM33XX_IOPAD(0x8ec, PIN_OUTPUT | MUX_MODE0) /* lcd_ac_bias_en.lcd_ac_bias_en */
>;
};

dcan1_pins_default: dcan1_pins_default {
pinctrl-single,pins = <
AM33XX_IOPAD(0x968, PIN_OUTPUT | MUX_MODE2) /* uart0_ctsn.d_can1_tx */
AM33XX_IOPAD(0x96c, PIN_INPUT_PULLDOWN | MUX_MODE2) /* uart0_rtsn.d_can1_rx */
>;
};
ehrpwm1_pins: pinmux-ehrpwm1-pins {
pinctrl-single,pins = <
AM33XX_IOPAD(0x848, PIN_OUTPUT_PULLDOWN | MUX_MODE6) /* gpmc_a2.ehrpwm1a */
>;
};
};


/ {
model = "TI AM335x BeagleBone Black";
compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx";

backlight: backlight {
status = "okay";
compatible = "pwm-backlight";
pwms = <&ehrpwm1 0 500000 0>;

brightness-levels = <0 51 53 56 62 75 101 152 255>;
default-brightness-level = <8>;
};

panel {
compatible = "ti,tilcdc,panel";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&lcd_pins_s0>;
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;
dma-burst-sz = <16>;
bpp = <32>;
fdd = <0x80>;
sync-edge = <0>;
sync-ctrl = <1>;
raster-order = <0>;
fifo-th = <0>;
};

display-timings {
800x480p62 {
clock-frequency = <68000000>;
hactive = <800>;
vactive = <480>;
hfront-porch = <64>;
hback-porch = <5>;
hsync-len = <47>;
vback-porch = <2>;
vfront-porch = <13>;
vsync-len = <2>;
hsync-active = <1>;
vsync-active = <1>;
};
};
};

};



&lcdc {
status = "okay";
};

&dcan1 {
status = "okay"; /* Enable only if Profile 1 is selected */
pinctrl-names = "default";
pinctrl-0 = <&dcan1_pins_default>;
};

&epwmss1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&ehrpwm1_pins>;

ecap@48302100 {
status = "disable";
};

pwm@48302200 {
status = "okay"; /* ehrpwm1 */
};
};

这是我的设备树配置，背光可以使用，但是LCD没有显示logo，用fbdev发现没有CONFIG_FB_DA8XX_TDA998X这个选项，用DRM现在配置后没有logo显示
内核配置了下面的选项
<*> Direct Rendering Manager (XFree86 4.1.0 and higher DRI support) --->

<*> OMAP DRM
[*] Enable writeback support for OMAP DRM driver
-*- OMAP2+ Display Subsystem support --->
OMAPDRM External Display Device Drivers --->
<*> DRM Support for TI LCDC Display Controller

用DRM driver的话，config文件里有添加下面语句吗？
CONFIG_DRM=y/m
CONFIG_DRM_I2C_NXP_TDA998X=y/m
CONFIG_DRM_TILCDC=y/m

包含的

tda998x 0-0070: Error applying setting, reverse things back
tda998x: probe of 0-0070 failed with error -22
看打印，发现ta998x报错，还没有找到原因

tda998x 0-0070: Error applying setting, reverse things back
tda998x: probe of 0-0070 failed with error -22
看打印，发现ta998x报错，还没有找到原因

请问在"trying to open device 'tilcdc'...done "后面还有打印信息吗？

问题已经解决，是由于包含了一个dtsi文件中已经配置了LCD，导致我配置的不起作用

感谢分享！