imx6ul 添加串口修改设备树后 uart2 可以发不能收其余的收发都不行

只看该作者 · 2016-5-5 14:04

只看该作者 · 2016-5-5 14:17

自己先顶一下。应该直接修改设备树就行吧不行修改相关的代码了吧不知道是不是这样？。还有不知道是不是因为我设备树修改的有问题？

只看该作者 · 2016-5-5 14:23

这是启动时候的信息
Serial: IMX driver
2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 58, base_baud = 5000000) is a IMX
console [ttymxc0] enabled
21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 59, base_baud = 5000000) is a IMX
21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 60, base_baud = 5000000) is a IMX
21f0000.serial: ttymxc3 at MMIO 0x21f0000 (irq = 61, base_baud = 5000000) is a IMX
21f4000.serial: ttymxc4 at MMIO 0x21f4000 (irq = 62, base_baud = 5000000) is a IMX
serial: Freescale lpuart driver
imx sema4 driver is registered.

只看该作者 · 2016-5-5 14:41

&uart1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart1>;
status = "okay";
};

&uart2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart2>;
fsl,uart-has-rtscts;
/* for DTE mode, add below change */
/* fsl,dte-mode; */
/* pinctrl-0 = <&pinctrl_uart2dte>; */
status = "okay";
};

&uart3 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart3>;
status = "okay";
};

&uart4 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart4>;
status = "okay";
};

&uart5 {
pintctrl-names = "default";
pinctrl-0 = <&pinctrl_uart5>;
status = "okay";
};

只看该作者 · 2016-5-5 14:42

pinctrl_uart1: uart1grp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO02__UART1_DCE_TX 0x1b0b1
MX6UL_PAD_GPIO1_IO03__UART1_DCE_RX 0x1b0b1
>;
};

pinctrl_uart2: uart2grp {
fsl,pins = <
MX6UL_PAD_UART2_TX_DATA__UART2_DCE_TX 0x1b0b1
MX6UL_PAD_UART2_RX_DATA__UART2_DCE_RX 0x1b0b1
/* MX6UL_PAD_UART2_RX_DATA__UART2_DCE_RTS 0x1b0b1
MX6UL_PAD_UART2_TX_DATA__UART2_DCE_CTS 0x1b0b1*/
>;
};

pinctrl_uart3: uart3grp {
fsl,pins = <
MX6UL_PAD_UART3_TX_DATA__UART3_DCE_TX 0x1b0b1
MX6UL_PAD_UART3_RX_DATA__UART3_DCE_RX 0x1b0b1
>;
};

pinctrl_uart4: uart4grp {
fsl,pins = <
MX6UL_PAD_UART4_TX_DATA__UART4_DCE_TX 0x1b0b1
MX6UL_PAD_UART4_RX_DATA__UART4_DCE_RX 0x1b0b1
>;
};

pinctrl_uart5: uart5grp {
fsl,pins = <
MX6UL_PAD_UART5_TX_DATA__UART5_DCE_TX 0x1b0b1
MX6UL_PAD_UART5_RX_DATA__UART5_DCE_RX 0x1b0b1
>;
};

只看该作者 · 2016-5-5 15:41

看下收的引脚有没有被复用

只看该作者 · 2016-5-5 18:24

嗯目前 /dev/ttymxc3能正常使用了还是设备树里面管脚没有配置好其他的还没修正好

pinctrl_uart4: uart4grp {
fsl,pins = <
MX6UL_PAD_LCD_CLK__UART4_DCE_TX 0x1b0b1
MX6UL_PAD_LCD_ENABLE__UART4_DCE_RX 0x1b0b1
/*MX6UL_PAD_UART4_TX_DATA__UART4_DCE_TX 0x1b0b1
MX6UL_PAD_UART4_RX_DATA__UART4_DCE_RX 0x1b0b1*/
>;
};