Hi guys
I want to use UART5 instead of SPI2 (the processor is IMX6G2C (IMXUL):
UART5_TX (ALT8) --> CSI_DATA00 (now SPI2_CLK)
UART5_RX (ALT8) --> CSI_DATA01 (now SPI2_CSn)
I've modified the device tree and after connecting with UART->USB adapter I can see the echo on the terminal (remote, because the local one is disabled) but I can't see the device in /dev directory.
The ttymxc3 (uart4) is available at /dev/ttymxc3, its debug port and it works like charm.
Some important parts of the the device tree (imx6ul-liteboard.dts):
/ {
chosen {
stdout-path = &uart4;
bootargs = "console=ttymxc3,115200";
};
// (...)
};
&iomuxc {
// (...)
pinctrl_uart5: uart5grp {
fsl,pins = <
MX6UL_PAD_CSI_DATA00__UART5_DCE_TX 0x1b0b1
MX6UL_PAD_CSI_DATA01__UART5_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
>;
};
// (...)
};
// (...)
&uart4 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart4>;
status = "okay";
};
&uart5 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart5>;
compatible = "fsl,imx21-uart";
status = "okay";
};
Adding or removing "compatible = "fsl,imx21-uart";" from uart5 changes nothing.
In the imx6ul.dtsi there is defined alias serial4 = &uart5; there are /dev/ACM0 to /dev/ACM7 but non of them respond.
Do you have an idea of what is missing?
