RK3308内核使能串口1后PC给它发送数据会echo回传，板子给PC发数据正常，求指点

Chip Platform Rockchip
1

使能uart1在板级DTS文件rk3308-roc-cc-dmic-pdm_emmc.dts里添加以下代码:

&fiq_debugger {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&uart2m0_xfer>;
};

&uart1 {
    status = "okay";
};

编译下载后内核打印错误信息如下：

[    0.381267] Serial: 8250/16550 driver, 5 ports, IRQ sharing disabled
[    0.383212] rockchip-pinctrl pinctrl: pin gpio1-22 already requested by fiq-debugger; cannot claim for ff0b0000.serial
[    0.383250] rockchip-pinctrl pinctrl: pin-54 (ff0b0000.serial) status -22
[    0.383268] rockchip-pinctrl pinctrl: could not request pin 54 (gpio1-22) from group uart1-cts  on device rockchip-pinctrl
[    0.383283] dw-apb-uart ff0b0000.serial: Error applying setting, reverse things back
[    0.383719] ff0b0000.serial: ttyS1 at MMIO 0xff0b0000 (irq = 12, base_baud = 5078125) is a 16550A
[    0.384785] ff0e0000.serial: ttyS4 at MMIO 0xff0e0000 (irq = 13, base_baud = 5078125) is a 16550A
[    0.386688] [drm] Initialized drm 1.1.0 20060810

UART SDK文档里说：
设备正常注册就是以上log，如果pinctrl跟其他驱动有冲突的话，会报pinctrl配置失败的log。

我这有冲突的话，该怎么修改呢，求解答

2

本帖最后由 luffycheung 于 2019-10-31 13:50 编辑

已解决。

打印pinctr错误–> uart1需要重写pinctrl选项，去掉cts和rts。

echo回传现象 → 由于rk3308终端下执行了cat /dev/ttyS1命令所至。重启rk3308后pc串口软件下发数据正常。
最终dts配置如下，也使能了uart0:

&fiq_debugger {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&uart2m0_xfer>;
};

&uart0 {
    status = "okay";
};

&uart1 {
    pinctrl-names = "default";
    pinctrl-0 = <&uart1_xfer>;
    status = "okay";
};