如何将Type-C修改为普通USB？

CPU：RK3399

系统：Android 7.1.2

为了降低成本，主板将Type-C改为MicroUSB接口，节省了fu***302芯片

参考Rockchip的官方文档第4部分：Micro USB2.0 OTG DTS配置

RKDocs/common/u***/Rockchip-Developer-Guide-Linux4.4-RK3399-USB-DTS-CN.pdf

&tcphy0 {

;

};

&u2phy0 {

;/* Micro USB2 PHY删除了extcon属性*/

otg-vbus-gpios = ;/* Vbus GPIO配置*/

u2phy0_otg: otg-port {/*文档中错误写成了u2phy1_otg */

;

};

......

};

&u***drd3_0 {

extcon = ;/* Micro USB3控制器的extcon属性引用u2phy0 */

;

};

&u***drd_dwc3_0 {

;/* Micro USB3控制器的dr_mode配置为otg */

;/* maximum-speed属性配置为high-speed */

phys = ;/* phys属性只引用USB2 PHY节点*/

;

;

};

按照文档中说明，修改这部分就可以了，但是编译内核部分烧录后，不能进安卓系统，串口一直循环打印如下：

[9.878630] init: Starting service'surfaceflinger'...

[10.294620] init: Service'surfaceflinger'(pid532) killed by signal6

[10.294664] init: Service'surfaceflinger'(pid532) killing any childreninprocess group

[10.294709] init: Service'zygote' i***eing killed...

[10.356365] init: Service'zygote'(pid254) killed by signal9

[10.356441] init: Service'zygote'(pid254) killing any childreninprocess group

[10.356634] init: write_file: Unable to open'/sys/android_power/request_state': No such file or directory

[10.356778] init: write_file: Unable to write to'/sys/power/state': Invalid argument

[10.356805] init: Service'audioserver' i***eing killed...

[10.357239] init: Service'cameraserver' i***eing killed...

[10.357327] init: Service'media' i***eing killed...

[10.357454] init: Service'netd' i***eing killed...

[10.358943] init: Starting service'zygote'...

[10.364342] init: Service'audioserver'(pid299) killed by signal9

[10.364427] init: Service'audioserver'(pid299) killing any childreninprocess group

[10.365879] init: Starting service'audioserver'...

[10.369573] init: Service'netd'(pid310) killed by signal9

[10.369677] init: Service'netd'(pid310) killing any childreninprocess group

[10.370582] init: Untracked pid575killed by signal9

[10.374127] init: Service'media'(pid297) killed by signal9

[10.374192] init: Service'media'(pid297) killing any childreninprocess group

[10.375119] init: Service'cameraserver'(pid300) killed by signal9

[10.375158] init: Service'cameraserver'(pid300) killing any childreninprocess group

[10.376450] init: Starting service'media'...

[10.378976] init: Starting service'cameraserver'...

[10.382610] init: couldn't write 580 to /dev/cpuset/camera-daemon/tasks: No such file or directory

[12.079202] init: Starting service'netd'...

开始怀疑是因为没有全部编译的问题，但是全部编译烧录后，还是不能开机，一直提示找不到drm device，串口一直循环打印如下：

__bionic_open_tzdata: couldn't find any tzdata when looking for GMT!

Starting recovery (pid185) on Fri Jan18 08:52:30 2013

bootmode = emmc

recovery filesystem table

=========================

0/mnt/internal_sd vfat /dev/block/platform/fe330000.sdhci/by-name/user0

1/mnt/external_sd vfat /dev/block/mmcblk0p10

2/system ext4 /dev/block/platform/fe330000.sdhci/by-name/system0

3/cache ext4 /dev/block/platform/fe330000.sdhci/by-name/cache0

4/metadata ext4 /dev/block/platform/fe330000.sdhci/by-name/metadata0

5/data ext4 /dev/block/platform/fe330000.sdhci/by-name/userdata0

6/cust ext4 /dev/block/platform/fe330000.sdhci/by-name/cust0

7/custom ext4 /dev/block/platform/fe330000.sdhci/by-name/custom0

8/misc emmc /dev/block/platform/fe330000.sdhci/by-name/misc0

9/uboot emmc /dev/block/platform/fe330000.sdhci/by-name/uboot0

10/charge emmc /dev/block/platform/fe330000.sdhci/by-name/charge0

11/resource emmc /dev/block/platform/fe330000.sdhci/by-name/resource0

12/parameter emmc /dev/block/platform/fe330000.sdhci/by-name/parameter0

13/boot emmc /dev/block/platform/fe330000.sdhci/by-name/boot0

14/recovery emmc /dev/block/platform/fe330000.sdhci/by-name/recovery0

15/backup emmc /dev/block/platform/fe330000.sdhci/by-name/backup0

16/trust emmc /dev/block/platform/fe330000.sdhci/by-name/trust0

17/baseparameter emmc /dev/block/platform/fe330000.sdhci/by-name/baseparameter0

18/frp emmc /dev/block/platform/fe330000.sdhci/by-name/frp0

19/tmp ramdisk ramdisk0

emmc_pointis/dev/block/mmcblk1

sd_pointis(null)

sd_point_2is(null)

I:InternalSD_ROOT: /mnt/internal_sd

I:ExternalSD_ROOT: /mnt/external_sd

read cmdline

[4.309235] fs_mgr: Warning: unknown flag resize

I:Boot command: boot-recovery

I:Got argumentsfromboot message

[4.311229] fs_mgr: Warning: unknown flag resize

=== startvoiddumpCmdArgs(int,char**):296===

argv[0] =  recovery.

argv[1] =  --wipe_all.

localeis[en_US]

stageis[]

reasonis[(null)]

cannot find/open a drm device: No such file or directory

cannot open fb0: No such file or directory

[4.352842] init: Service'recovery'(pid185) killed by signal11

[4.352952] init: Service'recovery'(pid185) killing any childreninprocess group

[9.358734] init: Starting service'recovery'...

查看dts文件，里面还有一个地方&cdn_dp使用了fu***0，屏蔽此处即可开机

&cdn_dp {

;

extcon = ;

phys = ;

};

最后建议把i2c中与fu***302通讯的部分也disable掉，此处不改也没有问题，只是i2c不通，但可以正常开机。

fu***0: fu***30x@22{

;

reg = <0x22>;

;

pinctrl-0= ;

int-n-gpios = ;

vbus-5v-gpios = ;

;

};



b1e03227fa9720da4fde362389b7768.png