[RK3399] Type-C改为MicroUSB

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 fusb302芯片

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

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

&tcphy0 {
    status = "disabled";
};

&u2phy0 {
    status = "okay"; /* Micro USB2 PHY 删除了extcon属性 */
    otg-vbus-gpios = <&gpio3 RK_PC6 GPIO_ACTIVE_HIGH>; /* Vbus GPIO配置 */
    u2phy0_otg: otg-port { /* 文档中错误写成了u2phy1_otg */
        status = "okay";
    };
    ......
};

&usbdrd3_0 {
    extcon = <&u2phy0>; /* Micro USB3控制器的extcon属性引用u2phy0 */
    status = "okay";
};

&usbdrd_dwc3_0 {
    dr_mode = "otg"; /* Micro USB3控制器的dr_mode配置为otg */
    maximum-speed = "high-speed"; /* maximum-speed 属性配置为high-speed */
    phys = <&u2phy0_otg>; /* phys 属性只引用USB2 PHY节点 */
    phy-names = "usb2-phy";
    status = "okay";
};

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' (pid ) killed by signal
[   10.294664] init: Service 'surfaceflinger' (pid ) killing any children in process group
[   10.294709] init: Service 'zygote' is being killed...
[   10.356365] init: Service 'zygote' (pid ) killed by signal
[   10.356441] init: Service 'zygote' (pid ) killing any children in process 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' is being killed...
[   10.357239] init: Service 'cameraserver' is being killed...
[   10.357327] init: Service 'media' is being killed...
[   10.357454] init: Service 'netd' is being killed...
[   10.358943] init: Starting service 'zygote'...
[   10.364342] init: Service 'audioserver' (pid ) killed by signal
[   10.364427] init: Service 'audioserver' (pid ) killing any children in process group
[   10.365879] init: Starting service 'audioserver'...
[   10.369573] init: Service 'netd' (pid ) killed by signal
[   10.369677] init: Service 'netd' (pid ) killing any children in process group
[   10.370582] init: Untracked pid  killed by signal
[   10.374127] init: Service 'media' (pid ) killed by signal
[   10.374192] init: Service 'media' (pid ) killing any children in process group
[   10.375119] init: Service 'cameraserver' (pid ) killed by signal
[   10.375158] init: Service 'cameraserver' (pid ) killing any children in process 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 (pid ) on Fri Jan  ::
bootmode = emmc
recovery filesystem table
=========================
   /mnt/internal_sd vfat /dev/block/platform/fe330000.sdhci/by-name/user
   /mnt/external_sd vfat /dev/block/mmcblk0p1
   /system ext4 /dev/block/platform/fe330000.sdhci/by-name/system
   /cache ext4 /dev/block/platform/fe330000.sdhci/by-name/cache
   /metadata ext4 /dev/block/platform/fe330000.sdhci/by-name/metadata
   /data ext4 /dev/block/platform/fe330000.sdhci/by-name/userdata
   /cust ext4 /dev/block/platform/fe330000.sdhci/by-name/cust
   /custom ext4 /dev/block/platform/fe330000.sdhci/by-name/custom
   /misc emmc /dev/block/platform/fe330000.sdhci/by-name/misc
   /uboot emmc /dev/block/platform/fe330000.sdhci/by-name/uboot
   /charge emmc /dev/block/platform/fe330000.sdhci/by-name/charge
   /resource emmc /dev/block/platform/fe330000.sdhci/by-name/resource
   /parameter emmc /dev/block/platform/fe330000.sdhci/by-name/parameter
   /boot emmc /dev/block/platform/fe330000.sdhci/by-name/boot
   /recovery emmc /dev/block/platform/fe330000.sdhci/by-name/recovery
   /backup emmc /dev/block/platform/fe330000.sdhci/by-name/backup
   /trust emmc /dev/block/platform/fe330000.sdhci/by-name/trust
   /baseparameter emmc /dev/block/platform/fe330000.sdhci/by-name/baseparameter
   /frp emmc /dev/block/platform/fe330000.sdhci/by-name/frp
   /tmp ramdisk ramdisk 

emmc_point is /dev/block/mmcblk1
sd_point is (null)
sd_point_2 is (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 arguments from boot message
[    4.311229] fs_mgr: Warning: unknown flag resize
=== start void dumpCmdArgs(int, char **): ===
argv[] =  recovery.
argv[] =  --wipe_all.
locale is [en_US]
stage is []
reason is [(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' (pid ) killed by signal
[    4.352952] init: Service 'recovery' (pid ) killing any children in process 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 fusb0，屏蔽此处即可开机

&cdn_dp {
    status = "disabled";
    extcon = <&fusb0>;
    phys = <&tcphy0_dp>;
};

最后建议把 i2c 中与 fusb302 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。

fusb0: fusb30x@ {
    compatible = "fairchild,fusb302";
    reg = <0x22>;
    pinctrl-names = "default";
    pinctrl- = <&fusb0_int>;
    int-n-gpios = <&gpio1  GPIO_ACTIVE_HIGH>;
    vbus-5v-gpios = <&gpio4  GPIO_ACTIVE_HIGH>;
    status = "disabled";
};