Use UART5 instead of SPI2.

MWolosewicz — Mon, 26 Apr 2021 13:53:01 GMT

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.

The dts includes (imx6ul-litesom.dtsi), which includes: (imx6ul.dtsi).

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?

Re: Use UART5 instead of SPI2.

MWolosewicz — Tue, 27 Apr 2021 13:10:47 GMT

Thanks, Igor,

I've checked everything again and the problem was that:

MX6UL_PAD_CSI_DATA01__UART5_DCE_RX

was defined elsewhere.

I just want to confirm that the rest of the configuration was ok.

i.MX ProcessorsのトピックRe: Use UART5 instead of SPI2.

Use UART5 instead of SPI2.

Re: Use UART5 instead of SPI2.

Re: Use UART5 instead of SPI2.