wk2114 一个uart口转多个uart口驱动和dts配置

本身的硬件连接是 wk2114连接主控端rk3568的uart0 然后从wk2114转出4个uart口 dtsi 修改内容 /*uart0: serial@fdd50000 { compatible = "rockchip,rk3568-uart", "snps,dw-apb-uart"; reg = <0x0 0xfdd50000 0x0 0x100>; interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH>; clocks = <&pmucru SCLK_UART0>, <&pmucru PCLK_UART0>; clock-names = "baudclk", "apb_pclk"; reg-shift = <2>; reg-io-width = <4>; dmas = <&dmac0 0>, <&dmac0 1>; pinctrl-names = "default"; pinctrl-0 = <&uart0_xfer>; status = "disabled"; };*/ 修改以上的节点配置为以下内容 uart0: serial@fdd50000 { compatible = "rockchip,wk2xxx_uart"; reg = <0x0 0xfdd50000 0x0 0x100>; interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH>; reset-gpio = <&gpio0 RK_PD6 GPIO_ACTIVE_HIGH>; irq-gpio = <&gpio0 RK_PD5 GPIO_ACTIVE_HIGH>; current-speed = <115200>; clock-frequency = <24000000>; clocks = <&pmucru SCLK_UART0>, <&pmucru PCLK_UART0>; clock-names = "baudclk", "apb_pclk"; reg-shift = <2>; reg-io-width = <4>; dmas = <&dmac0 0>, <&dmac0 1>; pinctrl-names = "default"; pinctrl-0 = <&uart0_xfer>; status = "okay"; }; 驱动文件夹的驱动放在RK_Android_11.0_sdk\kernel\drivers\misc目录下面并修改Makefile 文件增加obj-y += wk2xxx_uart.o obj-$(CONFIG_OCXL) += ocxl/ obj-$(CONFIG_MISC_RTSX) += cardreader/ obj-$(CONFIG_UID_SYS_STATS) += uid_sys_stats.o obj-$(CONFIG_PIR_ASCHIP) += pir-aschip.o obj-$(CONFIG_RK803) += rk803.o + obj-y += wk2xxx_uart.o 调试过程中可以打开wk2xxx_uart.c 文件里面的debug #ifdef _DEBUG_WK_TEST i=16; while(--i) { wk2xxx_read_reg(g_uart_port,1,WK2XXX_GENA,dat); printk( "WK2XXX_GENA=:%x\n",dat[0]); wk2xxx_write_reg(g_uart_port,1,WK2XXX_GENA,i); } #endif 初始化正常的话会打印以下内容 0.444307] uart_rk_init=== [ 0.444505] WK2XXX_GENA=:f0 [ 0.444893] WK2XXX_GENA=:ff [ 0.445279] WK2XXX_GENA=:fe [ 0.445664] WK2XXX_GENA=:fd [ 0.446051] WK2XXX_GENA=:fc [ 0.446435] WK2XXX_GENA=:fb [ 0.446820] WK2XXX_GENA=:fa [ 0.447202] WK2XXX_GENA=:f9 [ 0.447585] WK2XXX_GENA=:f8 [ 0.447967] WK2XXX_GENA=:f7 [ 0.448345] WK2XXX_GENA=:f6 [ 0.448728] WK2XXX_GENA=:f5 [ 0.449113] WK2XXX_GENA=:f4 [ 0.449496] WK2XXX_GENA=:f3 [ 0.449878] WK2XXX_GENA=:f2 dev目录下面就会挂载ttysWK的4个uart节点串口 console:/ # ls -l /dev/ttys* crwxrwxrwx 1 root root 207, 5 2022-11-08 19:47 /dev/ttysWK0 crwxrwxrwx 1 root root 207, 6 2022-11-08 19:47 /dev/ttysWK1 crwxrwxrwx 1 root root 207, 7 2022-11-08 19:47 /dev/ttysWK2 crwxrwxrwx 1 root root 207, 8 2022-11-08 19:47 /dev/ttysWK3